Ordinance 1042ORDINANCE NO. 1042
AN ORDINANCE AMENDING SECTION 2 OF ORDINANCE
NO. 592 OF THE CITY OF MIAMI BEACH, FLORIDA.,
KNOWN AND DESIGNATED AS THE "MIAMI BEACH
BUILDING COLE", BY ADDING THER TO, AT THE END
THEF.EOF, AN ADDITIONAL PART TO BE KNOWN AS
"PART XIV".
BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF MIAMI BEACH,
FLORIDA:
SECTION 1: That Section 2 of Ordinance No. 592 of the City of
Miami Beach, Florida, known and designated as the
"Miami Beach. Building Code," be and the same is
hereby amended by adding thereto at the end thereof,
an additional part to be known as Part XIV, and to
read as follows:
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14.0..01
SCOPE
PART XIV
AIR - C0i']t ITIONING
CHAPTER
The application of this Code is intended to insure the safe de-
sign, construction, installation, operation and inspection_ of
every refrigerating system employing a fluid which is vapor-
ized and is normally liquified in its refrigerating cycle,
when employed under the occupancy classifications listed in Sec-
tion 3. The provisions of this Code are not intended to apply
to the use of water or air as a refrigerant.
1x63.02
PURPOSE This Code is intended to provide reasonable safeguards to life,
limb, health, and property; to correct certain practices which
are inconsistent with safety; and to prescribe standards of
safety which will properly influence future progress and devel-
opments in refrigerating systems. It is the intent of this
Ccde to recognize listing by an approved nationally recognized
testing laboratory.
1+.63.03 This Ccde shall apply to refrigerating systems installed sub-
APPLIC-
ATION sequent to its adoption and to parts replaced or added to sys-
tems installed prior cr subseouent to its adoption. In cases
of practical difficulty or unnecessary hardship, the authority
having jurisdiction may grant exceptions from the literal re-
quirements of this Code or permit the use of other devices or
methods, but only when it is clearly evident that equivalent
protection is thereby secured.
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CHAPTER 64 DEFI7ITIONS
1+.64.01 For the purposes of this part, certain terms, phrases and words
DEFINI-
TIONS shall 'oe construed as set out in this Section. Where such
terms, phrases or words are defined in Part II of the Building
Code, as well as in this Section, the meaning ascribed in this
Section shall govern. Terms, phrases or words not defined in
Part II of the Building Code or in this Section shall have the
meanings commonly ascribed to them by the trade.
.01 ABSORBER: (Adsorber) is that part of the low side of an
absorption system used for absorbing (adsorbing) vapor refriger-
ant.
.02 ABSOPPTIOi'? SYSTEM: is a refrigerating system in which the
gas evolved in the evaporator is taken up by an absorber or
adsorber.
.03 ALTERATION: is the change or exchange of location, type
or size of any equipment connected with the system.
.04. BRAZED JOINT: for the purpose of this code, is a gas-
tight joint obtained 'oy the joining of metal parts with alloys
which melt at temperatures higher than 1000 F but less than the
melting temperatures of the joined parts.
.05 BRINE: is any liquid, used for the transmission of heat
without a change in its state, having no flash point or a flash
point above 150 F determines. by American Society for Testing
Materials method D93-46.
.06 CEITRIFUGAL COMPRESSOR: is a noin ositive displacement com-
pressor which depends, at least in part, on centrifugal force
for pressure rise.
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•
.07 CENTRIFUGAL SYSTEM: is a specific combination of machin-
ery for a given refrigerant, consisting of a power -driven cen-
trifugal compressor, a condenser, a water or other liquid cool-
er, and the regularly furnished accessories. The component
parts, after assembly and testing at the factory, are usually
disassembled for shipment.
.08 COMPRESSOR: is a specific machine, with or without acc-
essories, for compressing a given refrigerant vapor.
.09 COUP 7SSOR UNIT: is a condensing unit less the condenser
and liquid receiver.
.10 CONDE7SER: is a vessel or arrangement of *pipe or tubing
in which vaporized refrigerant is liquefied by the removal of
heat.
.11 CNE?SI"G UF1T: is a specific refrigerating machine
combination for a given refrigerant, consisting of one or more
power -driven cowessors, condensers, liquid receivers (when
required), and the regularly furnished accessories.
.12 CONTAINER: is a cylinder for the transportation of re-
frigerant. Interstate Commerce Commission's Regulations for
the Transportation by Rail of Explosives and other Dangerous
Articles in Freight, Express, and Baggage Services including
Specifications for Shipping Containers, effective October 1,
1930, with Supplement 18 effective May 3, 1948 (4).
.13 DEPP.RTNE1 STORE: is the entire space occupied by one
tenant or more than one tenant in an individual store where
more than 100 persons commonly assemble on other than the street
level floor for the purpose of buying personal wearables and
other merchandise.
--
.14 DESIGr' WORKING PRESSURE: is the maximum allowable working
pressure for which a specific rart of a system is designed.
.15 DIRECT SYSTEM: is one in uhich the evaporator is in
direct contact with the material or space refrigerated or is
located in air-circulating passages communicating with such
spaces.
.16 DOUBLE INDIRECT VENTED OPEN-SPRAY SYSTEM: is one in
which a liquid, such as brine or .Tater, cooled by an evapora-
tor located in a vented enclosure, is circulated through a
closed circuit to a second enclosure where it cools another
supply of a liquid, such as brine or water, and this liquid in tur:.-
is circulated to a cooling cha:nber and is sprayed therein.
.17 DOUBLE (OR SEC0T DARy) SYSTEM: is one in which an evapora-
tive regrigerant is used in a secondary circuit. For the pur-
pose of this ccde, each system enclosing a separate body of an
evaporative refrigerant shall be considered as a separate direct
system.
.18 DUCT: is a tube or conduit used for conveying or encasing
purposes
.01
.02
.03
as sr_.ecificaIly defined below:
Air duct:
air. (The
are not to
Pipe duct:
pipe.
is a tube or conduit used for conveying
air passages of self-contained systems
be construed as air ducts.)
is a tube or conduit used for encasing
TTire duct: is a
either moving or
tube or conduit used for encasing
stationary wire, rope, etc.
.19 ENTRAFTCE: is a confined passageway, immediately adjacent
to the door through which people enter a building.
.20 EVAPORATOR: is that part of the system in whici_ liquid
refrigerant is vaporized to produce refrigeration.
-5-
.21 EXIT: is a confined passageway immediately adjacent to
the c_oor through which people leave a building.
.22 EXPA"SIOH COIL: is an evaporator constructed of pipe or
tubing.
.23 FUSIBLE PLUG: is a device having a predetermined -temper-
ature fusible mc,noer for the relief of pressure.
.24 GENERATOR: is any device equipped with a heating element
used in the refrigerating syste-a to increase the pressure of
refrigerant in its vas or vapor state for the purpose of liquefy-
ing the refrigerant.
.25 HALLWAY: is a corridor for the passage of people.
.26 HIGH SIL: means the parts of a refrigerating system
under condenser pressure.
.27 HU1 ANLy OCCUPITD SPACE: is a space normally frequented
or occupied by people but e;:cluding machinery room and walk-
in coolers used primarily for refrigerated storage.
.2C INDIRECT CLOSE.. SURFACE SYSTEM: is one in which a liquid,
such as brine or water, cooled by an evaporator located in an
enclosure e::tcrnal to a cooling chamber, is circulated to and
through such a cooling chamber in pines or other closed circuits.
.29 INDIRECT °FEY SPRAY SYSTEM: is one in which a liquid, such
as brine or water, cooled by an evaporator lccated in an
enclosure external to a cooling chamber, is circulated to such
cooling chamber and is sprayed therein.
.30 INDIRECT SYSTEM: is one in which a liquid, such as
brine or water, cooled by the refrigerant, is circulated to
the material or space refrigerated or is used to cool air so
circulated.
.31 ITIDIRECT VEiqvrLD CLOSED -SURFACE SYSTEM: is one which a
liquid, such as brine or water, cooled by an evaporator located
in a vented enclosure external to a cooling chamber, is circu-
lated to and through such cooling chamber in pipes or other
closed circuits.
.32 LIQUID RECEIVT':R: is a vessel per:-^anently connected to a
system by inlct and outlet pipes for storage of a liquid re-
frigerant.
.33 LOBBY: is a waiting room, or large hallway serving as a
waiting room.
.34 LCW SIDE: means the parts of a refrigerating system under
evaporator pressure.
.35 iaCIIII'TRY : is the refrigerating equipment forming a part
of the refrigerating system including any or all of the following -
compressor, condenser, generator, absorber(adsorber), liquid
receiver, connecting pipe, or evaporator.
.36 MACHh1ERY ROO11: is a room in which a refrigerating system
is permanently installed and operated 'out not including evapor-
ators located in a cold storage room, refrigerator box, air
cooled space, or other enclosed space.' Closets solely contained
within, and opening only into, a room shall not be considered
machinery rooms but shall be considered a part of the machinery
room in which they are contained -or open into. It is not the in-
tent of this definition to cause the space in which a self-con-
tained system is located to be'classified as a machinery room.
.37 MACHINERY ROOM -JLASS T.:
is a room having machinerj, but no
flame -producing apparatus permanently installed and operated, and
also conforming to the following:
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.01 Any doors, communicating with the building, shall be
approved self-closing, tight-fitting fire doors.
.02 Walls, floor, and ceiling shall be tight and of not
less than one-hour fire-resistive construction.
,03 It shall have an exit door which opens directly to
the outer air or through a vestibule-tyre exit equip-
ped with self-closing, tight-fitting doers.
.04 Exterior openings, if present, shall not be under any
fire escape or any open stairway.
.05 All pipes piercing the interior walls, ceiling, or
floor of such room shall be tightly sealed to the walls;
ceiling, or floor through which they pass.
.06 Emergency remote controls to stop the action of the
refrigerant compressor shall be provided and located
immediately outside the machinery- room.
.07 Mechanical means shall be provided for ventilation.
.08 Emergency remote controls for the mechanical means
of ventilation shall be provided and located outside
the machinery room.
.38 MA`rUFACTUBER : is, for the purpose of this code, the com-
pany or organization which evidences its responsibility by
affixing its name or nationally registered trade-mark or trade
name to the refrigeration equipment concerned.
.39 I1ECHA`TICAL JOINT: for the Durpose of this cede, is a gas-
tight joint, obtained by the joining of metal parts through a
positive-holding mechanical construction.
.40 NOIPCSITIVE DISPLACE= COMPRESSOR: is a compressor in
which increase in vapor pressure is attained without changing
the internal volume of the compression chamber.
1
.41 PIPING: means the pipe or tube mains for interconnecting
the various parts of a refrigerating system.
.42 PLENUM CHAMBER: is an air compartment maintained under
negative or positive pressure and connected to one or more
distributing duct.
.43 POSITIVE DISPLACEI E_TT COMPRESSOR: is a compressor in
which increase in vapor pressure is attained by changing the
internal volume of the compression chamber.
.44 PRESSURE-IIOSING ELEMENT: is any device or portion of the
equipment used for the purpose of increasing the refrigerant
vapor pressure.
.45 PRESSURE-LIiITTI'M DEVICE: is a rressure-responsive mech-
anism designed to automatically stop the operation of the
pressure -imposing element at a predetermined pressure.
.46 PRESSURE RELIEF DEVICE: is a pressure -actuated valve or
rupture member designed to automatically relieve excessive pres-
sure.
.47 PRESSURE -RELIEF VALVE: is a pressure -actuated valve held
closed by a spring or other means and designed to automatically
relieve pressure in excess of its setting.
.48 PRESSURE VESSEL: is any refrigerant -containing receptacle
of a refrigerating system, other than evaporators, each separate
section of which does not exceed 1/2 cubic foot of refrigerant -
containing volume, expansion coils, compressors, controls,
headers, pipe, and pipe fittings.
.49 RECIPROCATIr COMPRESSOR: is a positive displacement com-
pressor with a piston or pistons moving in a straight line but
alternately in opposite directions.
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.50 REFRIGERANT: is a substance used to produce refrigeration
by its expansion or vaporization.
.51 REFRIGERATI'?G : for the purpose of this code shall be
synonymous with air conditioning.
.52 REFRIGERATING SYSTEM: is a combination of interconnected
refrigerant -containing parts constituting one closed refrigerant
circuit in which a refrigerant is circulated for the purpose
of extracting heat.
.53 RE PA LLS: replacing or repairing parts which do not
require the change of location, size or capacity of any major
equipment.
.54 RUPTURE IDLER: is a device that will automatically rup-
ture at a predetermined pressure.
.55 SEALED ABSORPTIM1 SYSTEM: is a unit system for Group 2
refrigerants only in which all refrigerant -containing parts
are made permanently tight by welding or brazing against re-
frigerant loss.
.56 SELF-CONTAINED SYSTEM: is a complete factory -made and
factory tested system in a suitable frame or enclosure which
is fabricated and shipped in one or more sections and in which
no refrigerant -containing parts are connected in the field
ether than by companion or block valves.
.57 SHALL: Where "shall" or "shall not" is used for a pro-
vision specified, that provision is intended to be mandatory.
.58 SHOULD: "Should" or "it is recommended" is used to in-
dicate provisions which are not mandatory but which are pointed
out here as recomnded good practice.
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.59 SOLDERED JOINT: for the purpose of this code, is a gas-
tight joint obtained by the joining of metal parts with metc.11ic
mixtures or alloys which melt at temperatures 'below 1000 F
and. above 400 F.
.60 STOP VALVE: is a shut-off for controlling the flow of
refrigerant.
.61 TENA!T: as herein used, shall be construed as a person,
firm, or corporation possessed with the legal right to occupy
premises.
.62 UNIT SYSTF'hi: is a self-contained system which has been
assembled and tested prior to its installaticn and which is
installed without connecting any refricTerant-containing parts.
A unit system may include factory -assembled companion or block
valves.
.63 WELDED JOI T: for the purpose of this code, is a gas-
tight joint, obtained by the joining of metal parts in the
plastic or molten state.
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1 4.65.01
PERMITS
REQUIRED
1+.65.02
PERMIT
FEES
1+.65.03
PLANS AND
SPECIFIC-
.ATIONS
1 4.65.04
ENGINEER
REQUIRED
CHAPTER 6. ADNINISTRTIVE REGULATIONS
Permits shall be obtained from the Building Department before
the installation, alteration, or major repair of any refriger-
ating or air-conditioning equipment. No permits shall be re-
quired for repairs that do not require the change of location,
size or capacity of any major equipment.
Permit fees shall be as prescribed in Section 1.02.02.09 of
the Building Code, based on the following established values:
Room air conditioners, less than 1/2 ton 150.00
Room air conditioners 1/2 ton or more but 200.00
not exceeding 1 ton
Self contained units, without duct work 200.00 per ton
and /or cooling towers
Self contained units, with duct c•rork and
for cooling powers 300.00 per ten
Built up systems and others 300.00 per ton
Plans shall be required with all permit applications for air-
conditioning equipment connected to two (2) or more seperately
occupied areas and/or where fifty (50) or more people are served.
All space designed to accommorlat:> one hundred (100) or more
people as permitted by Density Ordinance or other governing
requirements must be prepared under supervision and seal of
Registered Mechanical Engineer.
3+.65.05
INSPECTION All air conditioning and refrigerating installations, altera-
NOTICE
tions and major repairs shall 'oe subject to inspection and a
written notice shall be given to the Chief Building Inspector
by the Master Reirge'oator Fitter, firm or corporation doing
such refrigerating wo:'k or having same done as soon a: 'Le work
is ready for inspection.
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14.L.06 Inspection of Refrigerating work shall be made within forty -
TIME FOR
INSPEC- eight (48) hours, exc].usive of Saturday, Sunday and Holidays,
TION
after notice that tie sane is ready for inspection shall have
been received by the Building Department on a written dupli-
cate application blank furnished by the Building Department.
1+.65.07
INSPECTIONS Inspections are required to be made at the following stages of
REQUIRED
installation work:
.01 After the major portion of the equipment has been set;
.02 After the major portion of the duct work has been installed;
.03 After the major portion of the piping has been installed;
.04 Before concealing any work;
.05 Before the final maximum test pressure is relieved from
refrigerant -containing equipment and Piping;
.06 During the final start up end /or running test;
.07 Final inspection after all requirements of this Ccde have
been complied with.
1+.65.08 Any work for which an application_ for inspection has been made,
REINSPEC-
TIONS which is found by the inspector to be in violation of this Code,
incomplete or inaccessible for inspection, shall, in the dis-
cretion of the inspector, require an application for reinspec-
tion. A fee of two dollars 02.00) shall 'oe paid by the appli-
cant for such re -inspection.
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CHAPTER 66
BUILDING OCCUPANCY CLASSIFICATION
]4+.6.01 For purposes of reguf_ating the installation of air-cenditicn-
CLASSIFI-
CATION ing systems, a"a bui7.dings are classified by occupancy as follows:
.01 INSTITUTIC AL: shall apply to a building or portion rf a
b'zilding in wh: ch persons are confined to receive medical,
charitab" s, educatio. al, or other care or treatment, or in
w':ich persons ar•3 held or detained by reason of public or civic
duty, iacludinr among others, hospitals, asylums, sanitariums,
police stations, jails, court houses with cells, and similar
occupancf
.C2 PULIIC ASSTiBLY: shall appy to building or rortion of
a cuilding in c'�.teh persons congregate for civic, political,
educational., religious, soci7.l., or reccetional purposes;
including among others, armo:•=.es, assembly rooms, auditoriums,
ball rooms, ba-tf, houses, bus terminals, broadcasting studios,
churches, colleges, court houses without cells, dance halls,
department storas, exhibition halls, fraternity halls, libra-
ries, lodge rooms, mortuary chapels, museums, passenger depots,
schools, skatin1 rinks, subway stations, theators, and similar
occupanci 3s.
.03 RESIDE, 'IA ,: shall ap3 7 to a building or portion of a
building in which sleeping accommodations are provided for more
than two families, including among others, club houses, convents,
dormitories, hotels, lodging houses, multiple storey apartments,
studios, t.enement3, a .c similar occ soar_cies.
14.66.02
LOCATION
IN BUILD -
.04 C0i'1ERCIAL: shall apply to a building or portion of a
building used for the transaction of business; for the rendering
of professional services; for the supplying of food, drink,
or other bodily needs and comforts; for manufacturing purposes
or for the performance of work or labor (except as included
under Industrial Occupancy) including among others, bake shops,
fur storage, laboratories, loft buildings, markets, office
buildings, professional buildings, restaurants, stores other
than department stores, and simil.7r occupancies.
.05 INDUST:.IAL : shall apply to a buildi _-.g or portion of a
building used for manufacturing, processing, or storage of
materials or pro(ucts, includin(i among others, chemical, food,
candy and ice cream factories,
plants, refineries, perishable
occupancies. When occupied by
ice making plants, meat packing
food warehouses, and similar
a single tenant, the entire build-
ing shall be construed as Industrial.
.06 NIL) OCCUPANCY: shall apply to a building occupied or
used for different purposes in different areas within the same
building. When the differing occupancies are completely sep-
arated from eacl-other by solid partitions, floors and ceilings
with all onen_ings protected by self-closing doors, the require-
ments for each occupancy, so separated, shall apply individually.
When not so separated the occupancy to which the most rigid reg..
ulations apply shall be effective for the entire building.
All air conditioning and/or refrigerating equipment shall be
installed in an css!ly accessible manner,
14.67.01
REFRIGER-
ATING
SYSTEM
CHAPTER 67
REFRIGERATING SYSTEM CLASSIFICATIONS
Refrigerating s, -stems as defined in Sub -section 34.64.01.52,
aye sub -divided into classes descriptive of the method employ-
ed for extracting heat, as follows:
.01 DIRECT SYSTEM: 3.s one in which the evaporator is in direct
oontact with thr, material or space refrigerated or is located in
air -circulating passages cormunicating with such spaces.
.02 IVDIRECT SYSTEM: is ov:e in which a liquid such as brine or
water cooled by the refrigerant is circulated to the material or
space refrigerated, or is used to cool air so circulated. In-
direct systers are distinguished as to type or method of appli-
cation as f o11 ;yrs :
.01 Inci'rect Open Spray: is one in which a liquid, such as
brine or water, cooled by aa evaporator located in an enclosure
external tc a cooling chamber, is circulated to such cooling
chamber and is sprayed therein.
.02. Indirect Closed Surface: is one in which a liquid,
such as brine or water, cooled by an evaporator located in an
enclosure external to a cooling chamber, is circulated to and
through such a cooling chamber in pipes or other closed circuits.
,03 Indirect Vented Closed Surface: is one in which a
liquid, such a3 brine or water, cooled by an evaporator located
in a vented enclosure external to a cooling chamber, is circu-
lated to and through such cooling chamber in pipes or other
closed circuits-
.04 Double frdirect Vented Open Spray: is one in which a
liquid such as brine or water, cooled by an evaporator located in a
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14.67.02
ILLUSTRA—
TIVE DRAW—
ING
vented enclosure, is circulated throuth a closed circuit to a
second enclosure where it cools another supply of a liquid,
such as brine or water, and this liquid in turn is circulated
to a cooling chamber and is sprayed therein.
.03 DOUBLE (OR SECO1 DARY )REFRIGERAJI?T : is one in which an
evaporative refrigerant is used in a secondary circuit. For
the purpose of this code, each system enclosing a separate body
of an evaporative refrigerant shall 'ce considered as a separate
direct system.
The direct and various indirect systems referred to above are
illustrated in Figure 1.
(Drawing)
REFRIGERANT DIRECT SYSTQM
BRINE oR WATE0. ioOLCo
BY n'E FRIGF. RANT
ERNE. OR WATER-.: OPEN SORA`( SYSTEM
Pump
E VAPORATOR
BRINE OR WATER COOLED
BY RE FR16ERANT
6RINt OR WATER
Roe.np
ORI NL OR WATER CooLf0
BY REFRIGERA,Ir
BRINE O* WATER
!V1173R4TO0. /8RINE ORLAY
ATE
�R
VEHTRE FR D W
�t REFRIGERANT
60.{Nt e4.4%%t1 00V9L 0'. IND tECT
Vt'NTf l0 OP F N
WATIR I 1 5PRA? sYsrfrt
—pUMP pump
p
INO14EcT
CLO !D 5URFacE 519T04
INDIRECT VLNTLO
C1nstc SURFACE SYSTEM
CoNPRLSSop_
coNofryS[R
0.lcEtVtQ
—CooL.1146 CH AMDER.
—17—
•
CHAPTER 68
REFRIGERA.]T GROUPING
]4.68.01 Refrigerants, as defined in Sub -section "J4.64.01.50 are, for
GENERAL
the purpose of this Code, sub -divided into groups as follows:
.01 GROUP 1:
Carbon dioxide CO2
Dichlorodifluoromethane (Freon -12' CC12F2
Dichloromethane (Carrene No. 1)
(Methylene chloride) CH2CL2
Dichloromonofluororethane (Freon -21).. CHC12F
Dichlorotetrafluorcethane (.Freon -114) C2C12F4
Monochlorodifluoromethane (Freon -22) CHC1F2
Trichloromonofluoromethane (Freon -11)
(Carrene No. 2) CC13F
Trichlorotrifluoroethane (Freon -113).. C2C13F3
.02 GROUP 2:
Ammonia NE3
Dichloroethylene C2H2C12
Ethyl chloride C2H5C1
Methyl chloride CH3C1
Methyl formate HCOOCH3
Sulphur dioxide SO2
.03 GROUP 3:
Butane C4Hlo
ETHANE C2H6
Ethylene C2H4
Isobutane (CH3)3CH
Propane C3H8
-lg-
CHAPTER 69
SPECIAL REQUZ1EIFNTS FOR IHSTITL'TIC SAL,
PUBLIC ASSE13LY, RESIDEPTIAL, AND
COIRCIAL OCCUPANCIES
14.1.01 No refrigerating system shall be installed in or on a public
GE=NERAL
stairway, stair landing, entrance or exit; nor shall any enclosed
stairway be used as a plenum chamber for any air-conditioning
or ventilating system. No such system, or part thereof, shall
restrict or project into the required width or any path of exit.
Only Unit Systems containing not more than the quantity of
Group 1 refriger9nt specified in Table I shall be permitted
in public hallways or lobbies, except that in Residential and
Commercial Occupancies. Sealed Absorption Systems containing
not more than 3 pounds of Group 2 refrigerant may be installed.
14.69.02 Refrigerant piping shall not be carried through floors except
PIPING
THROUGH as follows:
FLOORS
.01 It may be carried from the basement to the first floor
or from the top floor to a machinery penthouse or to the roof.
.02 For the purpose of connecting to a condenser on the roof,
it gray be carried through an approved, 'rigid and tight con-
tinuous fire -resisting pipe duct or shaft having no openings
on intermediate floors, or it may be carried on the outer wall
of the building provided it is not located in an air shaft,
closed court, or in other similar open spaces enclosed within
the outer walls of the building.
-19-
.03 In systems containing Grcup 1 refrigerants, the refrigerant
piping may also be carried through floors, intermediate between
the first floor and the top floor, provided it is enclosed in
an approved, rigid, and tight continuous fire -resisting pipe
duct or shaft where it passes through any intermediate space.
Where the refrigerating system serves an air conditioning system,
the pining need not be enclosed where it passes through air
conditioned spaces served by that system. The pipe duct or
shaft shall be vented to the outside or to a space served by
the air conditioning system.
14.69.03 .01 DIRECT SYSTEMS: The maximum quantity of a Group I refrig-
GROUP I
REFIIG- erant in a direct system shall be as specified in Table I, except
ERANTS
as may be otherwise specifically restricted herein.
TABLE 1. Maximum Permissible Qun.ntities
of Group 1 Refrigerants for Direct S; -stems
Refrigerant name
Maximum Quantity
in lb per 1000
Chemical cu. ft. of humanly
Formula occupied space*
Carbon dioxide CO2 11
Dichlorodifluoromethane (Freon -12) CC12F2 31
Dichloromethane (Methylene chloride),
(Carrene No. i) CH2C12 6
Dichloromonofluromethane (Freon -21) CHC13F 13
Dichlorotetrafluoromethane (Freon -114) C2012F4 h.4
Monochlorodifluoromethane (Freon -22) CHC1F2 22
Trichloromonofluoromethane (Freon -11) CC13F 35
Trichlorotrifluoroethane (Freon -113) C2C13F3 24
-20-
*N S:
a) When the refrigerant -containing parts of a system are
located in one or more enclosed spaces, the cubical con-
tent of the smallest enclosed humanly occupied space ether than the
machinery room, shall be used to determine the permissible quantity
of refrigerant in the system.
b) When the evaporator is located in an air duct system, cub-
ical content of the smallest humanly occupied enclosed space
served by the air duct system shall be used to determine the permis-
sible quantity of refrigerant in the system; however, if the air
flow to any enclosed space served by the air duct system cannot be
shut off or reduced below one-quarter of its maximum, the cubical
contents of the entire space served by the air duct system may be
used to determine the permissible quantity of refrigerant in the
system.
c) Volatile charge in a control shall not be considered as
refrigerant.
.01 Institutional Occupancies: Direct systems shall be
limited to unit systems
containing not more than 20 pounds of Group I refrigerant,
except for kitchens, laboratories and mortuaries.
.02 Institutional and Public Assembly: Direct expansion
coils or evapor-
ators used for air conditioning and located downstream from, and
in proximity to, a heating coil, or located upstream within 18
inches of a heating coil, shall be fitted with relief device
discharging to the outside of the building in an approved
manner; except that such a relief device shall not be required on
-21-
unit or self-contained systems if t'_1r, irternal volume of the low
side of the system which. may be shut off by valves, divided by
the total weight of refrigerant in the system less the weight of
refrigerant vapor contained in the other parts of the system at
110 F, exceeds the specific "volume of the refrigerant at
critical conditions of temperature and pressure.
(Note: the above exemption is also stated in formula forn below.)
V1
shall be more than V sp
Wl"~''J2
where V1 low side volume, cu. ft.
V sp --_ specific volume at critical conditions
of temperature and pressure, cu ft per lb
total weight of refrigerant in system, ib
W2 weight of refrigeraat vax•or (1b) at 110
F in V2, or
Tv
specific volume of refrigerant, in
cu ft per lb, at 110 F, where
V2 == total volume of system less
V1 cu ft
.02 INDIRECT SYSTr:S: Any system containing more than the
quantity of a Group 1 refrigerant all-
owed in Table 1 shall be of the indirect type :•rith all refri-
gerant -containing parts, excepting parts mounted outside the
building, installed in a machinery room used for no other pur-
pose than for mechanical equipment.
.03 MACHINERY MOMS: In Residential and Commercial Occupancies
no open flare, or ap:aratus to produce
an open flame shall be installed in a machinery room when any
refrigerant other than carbon dioxide is used, unless flame is
-22-
14.69.04
GROUP 2
REFRIG-
ERANTS
enclosed and vented to open air. In Institutional and Public
Asse!::bly Occupancies, when more than 1 pound of a Group 1
refrigerant, other than carbon dioxide, is used in a system,
any portion of which is in a room 'there there is any apparatus
for producing an open flame, the restrictions of Group 2 shall
apply, unless the flame producing apparatus is providedwith a
hood and flue capable of removing the products of combustion
to open air.
.01 DIRECT SYST.rS: The maximum quantity of a Group 2 re-
frigerant in a direct system shall be as
specified in Table II except as nay be othertrise specifically
restricted herein. Direct systems containing Group 2 refrig-
erants shall not be used for air-conditioning for human comfort
in Institutional, Public Assembly, or r^s!dertial Occupancies,
and nay be used in Commercial Occupanices only when containing
not more than 20 pounds of refrigerant.
TABTE 2. Maximum Permissible Quantities of Group
2 Refrigerants for Direct Systa.ns*
Maximum
Type of pounds for various occupancies*
refrigerating Institu- Public Resi- Comer -
system tional Assembly dential cial
Sealed Absorption
Systems:
a) In public hall-
ways or lobbies
0 0 3 3
13) In other than public
hallways or lobbies 0** 6 6 20
-23-
Type of
refrigerating
system
Institu-
tional
Maximum
pounds for various occupancies
Public
Assembly
Resi-
dential
C omer-
cial
Self -Contained or Unit
Systems:
a) In public hallways
or lobbies 0 0
b) In other than public
hallways or lobbies 0 0#*
Other RefrigeratinF Systems
in Machinery Room (See 15.64.01.36) 0 0
Other Refrigerating Systems
in Class T Machinery Room 500 1000
(See 15.64.01.37)
0 0
6 20
300 600
No limit No limit
Direct systems containing Group 2 refrigerants shall not be used for air
conditioning for human comfort in Institutional, Public Assembly, and Resid-
ential Occupancies and shall be so used in Commercial. Occupancies only r•rhen
c.'ntaining not more than 20 pounds of refrigerant.
Six pounds allowed when installed in kitchens, l_a.bor: tories, and mor-
tuaries for applications other than air conditioning for human comfort.
.02 INDIRECT SYSTEMS: The maximum quantity of a Group 2
refrigerant in an indirect system shall
be as specified in Table III, except as may be otherwise speci-
fically restricted herein. Any system using a Group 2 refriger-
ant in excess of the quantities shown in Table II shall 'oe of
an indirect type.
TABLE 3. MAXIMUM PERMISSIBLE QUA_?TITIES OF GROUP
2 REFRIGERANTS FOR IiTIRECT S1STET S
Occupancy
Institutional
Public Assembly
Residential
Commercial
Column 1
Machinery Rooms (See
15.64.01.36) Max lb
0
0
Not more than 300 lb
Not more than 600 lb
Column 2
Class T Machinery Roos
(See 15.64.01.37) Max lb
Not more £ha`n`300 ib —
Not more than 1C00 lb
No limit
No limit
--214--
14.69.05
GROUP 3
REFRIG-
ERANTS
.01 Institutional and Public Assembly: Indirect systems
shall be of the vented closed
surface, or the double indirect vented open spray, type.
.02 Residential and Commercial: Indirect systems shall be
of the vented cosed
s-irface,.double indirect vented open spray, or the primary
circuit of double refrigerant, type.
.03 Machinery Rooms: Indirect systeris using Group 2 re-
frigerants shown in Column 1 of Table III shall have all refrig-
erant containing parts, except parts mounted outside the building;
installed in a machinery room, used for no ogler purpose than
for mechanical equipment. Such systems using refrigerant in
excess of the quantities in Column 1, but nos exceed those
specified in Column 2, shall have all ref=•=.g;rant-containing
parts installed in a Class T. machinery roc Where a mach-
inery room is required to Louse a refrigerating system contain-
ing any Group 2 refrigerant other than suipaur dioxide, no
flame producing device, or surfaces heatec'..zyJove 800° F. will
be permitted in such room, and all electrical equipment in the
room shall conform to the requirements for high hazard locations
of Part XI ETFCTRICAL of this Code.
Group 3 refrigerants shall not be used in Institutional, Public
Assembly, Residential, or Commercial Occupancies except in lab-
oratories for Commercial Occupancies. In such laboratory in-
stallations only unit systems containing not more than 6 pounds
shall be used unless the number of persons does not exceed one
person per 100 square feet of laboratory floor area, in which
case the requirements for Industrial Occupancy shall apply.
-25-
CHAPTER 70
SPECI^.L REQUIRELENTS FCR
INDUSTRIAL OCCUPANCIES
71.70.01 There shah be no restriction on the quantity or kind of re -
GENERAL
frigerant used in an Industrial Occupancy, except as follcu s:
.01 MUEBER OF PERSONS: When the number of persons above the
first floor exceeds one person per
100 square feet of floor area, the requirements of Commercial
Occupancies shall apply unless that portion of the building
containing more than one person per 100 square feet of floor
area above the first floor, together with its entrances and
exits, be cut off from the rest of the building by tight con-
struction with self-closing, tight -fitting doors.
-26-
CHAPTER 71
INSTALLATION REQUIREMENTS
A.71.01 .01 FOUNDATIONS AND SUPPORTS: Foundations and supports for
GENERAL
PROVISIONS condensing units, or compressor
units, shall be of substantial and non-combustible construction
when more than 6 inches high.
.02 PROTECTION OF MOVING PARTS: All moving parts of machinery
shall be provided with safety
guards in accordance with accepted safety standards.
.03 WORK ROOM: Adequate space shall 'oe provided around conden-
sing units or compressor units, for proper in-
spection and servicing.
.04 ILLUMINATION: Adequate electrical illumination shall be
provided for prover inspection and servicing
of condensing units, or compressor units.
.05 ELECTUCAL INSTALLATION: All electrical equipment and
wiring shall be installed in
accordance with the provisions of Part XI of the Building Code.
.06 GAS INSTALLATIONS: All gas burning equipment and gas
piping shall be installed in accordance
with the provisions of PART XII of the Building Code.
.07 ROOF MOUNTED EQUIPMENT: All roof mounted equipment shall
be securely anchored to suitable
supporting members of the roof framing, and may be required to
be provided with storm guys. All materials used to support such
equipment shall be treated so as to prevent rotting or corrosion.
Flashing shall be provided where required to prevent roof leaks.
-27-
14.71.02
WATER SUPPLY
AND DIS-
CHARGE
All water supply and discharge connections shall 'oe made in
accordance with the provisions of PART XII of the Building Code.
The following specific provisions shall apply.
.01 All condensation waste lines shall discharge indirectly,
or safe -waste, to the City sanitary sewer, or where avail-
able to a City storm sewer.
.02 Not more than 50 gallons per hour of waste water from water coo-
ed compressors shall be discharged into the City sanitary sewer.
.03 No over flow connection shall be made to any cooling tower
mounted on the roof of a building.
.04 Drain lines, or bleeder line connections, shall be in-
stalled
low point of
.05 Cooling
in condenser water circulating lines as near the
the system as practicable.
towers serving units of ten ton capacity or less,
which serve individual building units, may waste indirectly,
or safe -waste, into the City sanitary serer.
.06 Cooling systems serving units of more than ten ton capacity
shall be provided with bleeder lines discharging to a City
storm sewer, or to a drainage well, or as may be otherwise app-
roved by the Chief Building Inspector. Drain lines from such
cooling systems shall be run to the ground floor level indepen-
dent of any other drain lines, and shall discharge as provided
above.
.07 Where wells are used for cooling water, all such water
wasted, shall be discharged into a drainage well.
.08 No discharge line using City water shall be directly con-
nected to a sewer or drainage system, but shall discharge
over and above a trapped and vented plumbing fixture, or drain-
age well.
-28-
•
•
14.71.03 When the quantity of flammable refrigerant in any one refriger-
OPEN FLANES
ating system exceeds the amount given in Table 4 for each 1000
14.71.04
WITIDCW
TYPE Ai,-
CO'IDIT ION-
ING UNITS
1 x+.71.05
FLAT IABLE
REFRIGER-
ANTS
cubic feet of room volume in which the system or any part there-
of is installed, then no flame -producing device or hot surface
above 800 F. shall be permitted in such room and all electrical
equipment in the room shall conform to the requirements of
Hazardous Locations Class I of the latest edition of the National
Electrical Code. There shall be no flame producing device in-
stalled in any plenum chamber.
All individual air conditioning units installed in walls or
windows shall be securely anchored to the walls by approved
methods. Where a portion of a glass window is used the portion
to remain shall be replaced with ill plate glass where the area
is greater than 1.5 square feet, and with 1/8" double thick
glass where the area is 1.5 square feet or less. All glass shall
be securely held in place with approved glass clips.
Flammable refrigerants as listed in Table 4 shall not be used
in any refrigerating system in excess of 1000 pounds, except
by special approval of the Chief Building Inspector.
-29-
TABLE 4. MAXIMUM PERMISSIBLE QUAINITITIES
OF FLAMMABLE REFRIGERANTS
Name
Maximum quantity
Chemical in ib per 1000 cu
formula ft of room volume
Butane 04H10 2 1/2
Ethane C2H6 2 1/2
Ethyl chloride C2H5C1 6
Ethylene C2H4 2
Isobutane (CH3)3CH 2 1/2
Methyl chloride CH3C1 10
Methyl formate HCOOCH3 7
Propane C3H8 2 1/2
14.71.06 The following special requirements shall apply to machinery
MACHINERY
RCOMS rooms:
.01 Each refrigerating machinery room shall be provided with
tight fitting door or doors and have no partitions or open-
ings that will permit the passage of escaping refrigerant to
other parts of the building.
.02 Each refrigerating machinery room shall be provided with
means for ventilation to the outer air. The ventilation
shall consist of windows or doors opening to the outer air, of
the size shown in Table 5, or of mechanical means capable of
removing the air from the room in accordance *•rith Table 5. The
amount of ventilation for refrigerant removal purposes shall
be determined by the refrigerant content of the largest system
in the machinery room.
-33-
.03 Mechanical ventilation, when used, shall consist of one
or more power -driven exhaust fans, which shall 'oe capable
of removing from the refrigerating machinery room the amount of
air specified in Table 5. The inlet to the fan, or fans, or air
duct connection shall be located near the refrigerating equip -
rent. The outlet from the fan, or fans, or air duct connections
shall terminate outside of the building in an approved manner.
When air ducts are used either on the inlet or discharge side of
the fan, or fans, they shall have an area not less than speci-
fied in Table 5. Provision should be made for the inlet of air
to replace that being exhausted. Mechanical Ventillation for
Class T Machinery rooms shall operate continuously while the air
conditioning machinery is in operation. Ventilation shall con-
form to the requirement of Table 5.
TABLE 5. MINIMUM AIR DUCT AREAS AND OPENINGS
Weight of Mechanical Duct area, Open window
refrigerant discharge sq ft or door
in system, lb of air, cfm area, sq ft
UP TO 20 150 1/4 4
50 250 1/3 6
100 400 1/2 10
150 550 2/3 12 1/2
200 680 2/3 14
250 800 1 15
300 900 1 17
400 1,100 1 1/4 20
500 1,275 1 1/4 22
600 1,450 1 1/2 24
700 1,630 1 1/2 26
800 1,800 2 28
-31-
TABLE 5. cont'd
Weight of
refrigerant
in system, lb
Mechanical
discharge
of air, cfm
Duct area,
sq ft
Open window
or door
area, sq ft
UP TO 900 1,950 2
1,000 2,050 2
1,250 2,250 2 1/4
30
31
33
1,500 2,500 2 1/4 37
1,750 2,700 2 1/4 38
2,000 2,900 2 1/4 40
2,500 3,300 2 1/2 43
3,000 3,700 3 48
4,000 4,600 3 3/4 55
5,000 5,500 4 1/2 62
6,000 6,300 5 68
7,000 7,200 5 1/2 74
8,000 8,000 5 3/4 80
9,000 8,700 6 1/4 85
10,000 9,500 6 1/2 90
12,000 10,900 7 100
14,000 12,200 7 1/2 109
16,000 13,300 7 3/4 118
18,000 14,300 8 125
20,000 15,200 8 1/4 130
25,000 17,000 8 3/4 140
30,000 18,200 9 145
35,000 19,400 9 1/4 150
40,000 20,500 9 1/2 155
45,000 21,500 9 3/4 160
34.71.07 Ducts which are a part of an air-conditioning system for human
AIR DUCT
SYSTEMS comfort shall be installed in accordance with the provisions of
PART VIII of the Building Ccde.
14.71.08 The following special requirements shall apply to the control
NOISE
CONTROL and regulation of noise nuisance from air-conditioning machinery:
-32-
.01 411 equipment, existing or hereafter installed, regardless
or location, shall be maintained in good working order.
Equipment so located that normal operating noises create a nui-
sance to adjacent owners or occupants shall be provided with
sound proofing, or sound absorbing baffles, or enclosures, as
ap2roved, to insure maintainance of a reascnable noise level.
.02 All equipment in outer walls, on roofs, or in other exposed
locations, which are unduly noisy, and which cause valid complaints
from adjoining property owners or occupants, may be required to
be relocated, redesigned and/or enclosed in noise retarding
materials as determined by qualified engineers and approved by
the Chief Building Inspector.
.03 Special consideration shall be given to the planning of all
future installations to minimize the noise nuisance to ad-
joining property owners or occupants, and the Chief Building
Inspector shall have authority to reject or require the re -design,
of any system which in his opinion would cause such a noise
nuisance.
-33-
14 .72.01
P]RAL
11+.72.02
ENCLOSURE
OF SOFT
COPPER
TUBING
111.72.03
MINIMUM
REQUIRE -
MEETS FOR
PIPING
CHAPTER 72
REFRIGERANT PIPING
Refrigerant piping, valves, fittings, and related parts used in
the construction and installation of refrigerating systems shall
conform to the American Standard Code for Pressure Piping.
Rigid or flexible metal enclosures shall be provided for soft,
annealed copper tubing used for refrigerant piping erected on
the premises and containing other tla_z Group 1 refrigerants.
No enclosures shall be required for connections between condensing
unit and the nearest riser box, provided such connections do not
exceed 6 feet in length.
Specific minimum requirements for refr_gerant pipe and tubing
shall be as follows:
.01 Standard wall steel or wrought iron pipe may be used for
design working pressures not e:ceeding 300 psig, provided
lap welded, electric resistance welded, or seamless pipe is used
for sizes 2 inches and larger, and extra strong wall pipe is used
for liquid lines for sizes 1 1/2 inches and smaller conforming
to American Standard B36.10-1939.
.02 Standard iron pipe size copper and red brass (not less than
80 percent copper) pipe and tuning may be used and shall
conform to the dimensions given in Tables II and IV of ASTM
Specification B188 -47T.
.03 Watertube size hard copper tuning used for refrigerant
piping erected on the premises shall conform to ASTM
Specification B88-48. Types K or L, for dimensions and speci-
fications. Copper tuning 1/4 inch and 3/8 inch outside diameter
having a minimum wall thickness of 0.025 inch and 0.030 inch, res-
pectively, shall be considered as meeting the requirements for this
copper tubing.
.04 Soft annealed copper tubing used for refrigerant piping
erected on the premises shall not be used in sizes larger
than 7/8 inch outside diameter (3/4 inch nominal). It shall
conform to ASTM Specification B68-47, and shall have wall thick-
nesses not less than contained in ASTM Specification B88-48 for
Type L. Copper tubing 1/4 inch and 3/8 inch outside diameter
having a minimum wall thickness of 0.025 inch and 0.030 inch,
respective17, shall be considered as meeting the requirements
for this copper tubing.
.05 Soldered joints on copper tubing used in refrigerating
systems containing Group 2 or Group 3 refrigerants shall
be made with solders or alloys having melting points not less
than 1000 F.
14.72.04 Joints and all refrigerant-containing pa:2.ts of a refrigerating
PIPING
TIN AIR system located in an air duct of an air conditioning system for
DUCTS
human comfort shall be constructed to withstand, without leakage,
a temperature of 1000 F.
14.72.05 Refrigerant pipe joints shall 'oe exposed to view for visual in-
EXPOSED
JOINTS spection, excepting when insulated or mechanically protected,
or when located in the cabinet of a unit system, or installed
outside the building, or in a tight pipe duct or shaft vented to
the outer air.
14.72.06 .01 GEPERAL REQUIREMENTS: All systems containing more than
STOP
VALVES 50 pounds of a Group 1 refrigerant
or 6 pounds of a Group 2 or 3 refrigerant, other than systems
utilizing nonpositive displacement compressors, shall have stop
valves installed as follors:
-35.
14.72.07
LOCATION
OF REFRI-
GERATION
PIPING
•
.01 Each inlet of each compressor, compressor unit, or
condensing unit;
.02 Each discharge outlet of eaer compressor, compressor
unit, or condensing unit, and of each liquid receiver.
.02 SPECIAL REQUIREMENTS: All systems containing 100 pounds
or more of a refrigerant, other than
systems utilizing nonpositive displacement compressors, shall
have stop valves, in addition to those in 14.72.06.01, on each
inlet of each liquid receiver and each branch liquid and suction
line except that none shall 'oe required on the inlet of a receiver
in a condensing unit nor on the inlet of a receiver which is an
integral part of a condenser.
.03 VALVE MOUNTING: Stop valves used with soft annealed copper
tubing or hard drawn copper tubing 3/4
inch norin.,1 size or smaller shall be securely mounted, indepen-
dent of tuning fastenin;,s or supports. •
.04 VALVE MIMING: Stcn valves shall be suitably labeled if it
is not obvious what they control. • Numbers
may be used to label the valves provided a key to the numbers
is located near the valves.
.01 PIPING ESTRICTIONS: Refrigerant piping shall not be
Placed in any elevator, dumbwaiter,
or other shaft containing a moving object, or in any shaft which
has openings to living quarters, or to main exitaays. Such
piping shall not be placed in public hallways, lobbies or stair-
ways, except that such refrigerant piping may pass across a
public hallway if there are no joints in the section in the
hallway, and provided non-ferrous tubing of 1 inch nominal
-36-
diameter or smaller shall be run through a rigid metal pipe.
.02 PIPITX CLEARANCE: Refrigerant piping across any open
spaces which is accessible to the public
shall be not less than 7i feet above the floor of such space;
and all such piping shall be so installed as to provide no
interference with public passage.
14.72.01
GENERAL
CHAPTER 73
DESIG::T A -TD C0NSTRUCTIO1T
OF EQUIPPEET
.01 Every part of a refrigerating system, with the exception
of pressure gages and control _mechanisms, shall be designed,
constructed and assembled to withstand a test pressure not less
than the minimum refrigerant leak field test pressure specified
in Table 6, without being stressed beyond one-third of the ul-
timate strength of the material used. The minimum design work-
ing pressure is established in terms of the field test pressure
so that the minimum leak field test pressure, specified in
Table 6, can be safely applied. Rules governing pressure relief
valves, pressure limiting devices and other such devices shall
be based on the design working pressure selected.
.02 All materials used in the construction and installation of
refrigerating systems shall be suitable for conveying the
particular refrigerant to be used. Insofar as practicable,
no material shall 'ae used that will deteriorate because of the
refrigerant, or the oil, or the combination of both. It will
be required that system be charged with the refrigerant for which
it is designed and/or approved by the Chief Building Inspector,
and that it will be operated in a manner which will prevent, or
minimize corrosion
.03 Aluminum, zinc or magnesium shall not be used in contact
with methyl chloride in a refrigerating system, nor shall
magnesium alloys be used in contact with any Freon refrigerant.
14.73.02
MINIMUM
TEST
PRESSURES
1+.73.03
PRESSURE-
LINIITING
DEVICES
1 4.73.04
GAGES
Every refrigerant containing part of every syste-, including
pressure gages and control mechLnisms, shall be tested and proved
tight by the manufacturer at not less than the minimum refriger-
ant leak field test pressure specified in Table 6. Equipment
list as approved by a nationally recognized testing laboratory,
and having a follow-up inspection_ service shall be deemed to
meet the requireents of Sections 1 #.73.01 and 24,73.02.
.01 Pressure -limiting devices shall be provided on all systems
containing more than 20 pounds of refrigerant and operating
above atmospheric pressure, and on all water cooled systems so
constricted that the compressor or generator is capable of pro-
ducing a pressure in excess of the test pressure; except ;rater
cooled unit systems containing not more than 3 pounds of a Group
1 refrigerant, providing the system will safely relieve the re-
frigerant in case of failure of the water supply or providing
an overload device will stop the action of the compressor before
the pressure exceeds one-fifth the ultimate strength of the system,
.02 Pressure -limiting devices shall stop the action of the
pressure -imposing element at a -pressure not nore than 90
percent of the pressure -relief device setting, or 90 percent of
the refrigerant leak field test pressure actually applied, which-
ever is lower.
.03 Pressure-1i:iting devices shall be connected, with no
intervening stop valves, between the pressure -imposing
element and any stop valve on the disc':a.rge side.
.01 Liquid level gage glasses, e:-cept those of the bull's-eye
or reflex type, shall have automatic closing shut-off valves,
and such glasses shall be adequately protected against injury.
-39-
•
.02 The dials of pressure gages, when permanently installed
on the high side of a refrigerating system, shall be
graduated up to approximately double the operating pressure, but
in no ct,se less than 1.2 times the design working pressure.
;4.73.05 Each separately sold condensing unit and each compressor or
NAEE
PLATES compressor unit sold for field assembly in refrigerating
system shall carry a nameplate narked with the manufacturer's
name, nationally registered trademark or trade name, identi-
fication number, and the name of the refrigerant for which it
is designed.
-4a-
1'4.74.. 01
EXCEEDING
6 INCH
DIAMETER
CHAPTER a
REFRIGERANT CONTAINING
PRESSURE VESSELS
Refrigerant containing pressure vessels, except those having a
maximum allowable internal or external working pressure 15 psig
or less,
6 inches
rules of
irrespective of size, or having an inside diameter of
or less irrespective of pressure, shall comply with the
Section VIII of the 1949 Edition of the ASEE Boiler
Construction Code covering the requirements for the design,
fabrication, and inspection during construction of unfired pres-
sure vessels.
.01 Unfired pressure vessels having a gross capacity of 5 cubic
feet or less and designed for pressures not exceeding 250
nsig, and such vessels having a gross capacity of 12 cubic feet
or less and designed for pressures exceeding 250 psig, are ex-
empted from the inspection requirement of Paragraph U-65 of Sec-
tion VIII of the 1949 edition of the ASZE Boiler Construction
Code. However, such vessels shall otherwise comply with Section
VIII of the 1949 Edition of the ASIS Boiler Construction Code
including the required certification and stamping, but omitting
the code symbol. These provisions apply to each vessel, and not
toar assembly of vessels.
.02 Except as specified in Section 14.74.02, unfired pressure
vessels having a gross capacity of 5 cubic feet or less
which are exempted from compliance with Paragraph U-65 of Sec-
tion VIII of the 1949 edition of the ASNE Boiler Construction
Code, shall be considered as meeting the requirements of this
Section, provided that:
-41-
].4.24.02
NOT EXCEED-
ING 6 INCH
D IANETER
14.74.03
3AFETY
DEVICES
.01 The details of design and construction otherwise
uniform with the requirements of Section VIII of
the 1949 edition of the ASiE Boiler Construction Code;
.02 The materials of construction shall otherwise comply
with the provisions of Section VIII of the 1949
edition of the ASME Boiler Construction Cede;
.03 Welding operators and welding processes shall be
qualified as provided for in Section VIII of the
1949 Edition of the ASI1E Boiler Construction Code;
.04 Each vessel shall be tested and stamped in accordance
with Paragraph U-77 (e) of Section VIII of the 1949
Edition of the ASIS Boiler Construction Code, with either pneu-
matic or hydrostatic pressure;
.05 The certification required in Section 14.74.01.01
may be met by keeping a production series record of
material used and tests made. Certification for individual
vessels, where required, may be made by abstracting data from
the series record by affidavit.
Refrigerant containing pressure vessels not exceeding an in-
side diameter of 6 inches, regardless of pressure, shall be listed
either individually, or as part of refrigeration equipment, by
a nationally recognized testing laboratory and having a follow-
up inspection service; or if not so listed shall 'oe constructed
in accordance with the provisions of Section 14.74.01.02.
All pressure vessels, regardless of size or pressure shall be
equipped with safety devices conforming to the requirements of
Chapter 74.
-42-
:4.74.04
STANDARD
TESTS
.01 HYDROSTATIC TESTS: Fusion welded pressure vessels shall
be tested in accordance with the pro-
visions of Section VIII of the 1949 edition of the ASIS Boiler
Construction Code, except as pneumatic tests may be permitted.
.02 PNEUi VATIC TESTS: Vessels for use in service which are not
suitable for tests with testing liquid
and/or which cannot be readily dried, and the parts of which have
been previously tested by hydrostatic pressure to not less than
1 1/2 times the design working pressure of the vessel, may be
given a pneumatic test as prescribed in Paragraph U-64 (f),
Section VIII of the 1949 Edition of the ASNE Boiler Construction
Code.
CHAPTER a
RELIEF DEVICES
14.75.01 Every refrigerating system shall be protected by a pressure -
GENERAL
PROVISIONS relief device unless so constructed that pressure due to fire
conditions will be safely relieved by soldered joints, lead
gaskets, fusible plugs, or other parts of the system.
.01 No stop valve shall be located between any automatic pressure -
relief device or fusible plug and the part er parts of the
system protected thereby, except when the parallel relief de-
vices mentioned in 14.75.01 are so arranged that only one can
be rendered inoperative at a tine for testing or repair purposes.
.02 All pressure -relief devices shall be connected nearly as
practicable directly to the pressure vessel or other parts
of the system protected thereby, above the liquid refrigerant
level, and installed so that they are readily accessible for
inspection and repair and so that they cannot be readily rendered
inoperative. Fusible plugs may be located above or below the
liquid refrigerant level.
.03 The seats and discs of pressure -relief devices shall be
constructed of suitable material to resist refrigerant
corrosion or other chemical action caused by the refrigerant.
Seats or discs of cast iron shall not be used.
.04 The rated discharge capacity of a pressure -relief valve
for a refrigerant -containing vessel, expressed in pounds
of air per minute, shall 'oe determined at a pressure at the in-
let of the relief valve equal to 110 percent of the valve setting
in accordance ?•pith Paragraph UG -131, Section VIII of the 1950
Edition of the ASIE Boiler Construction Code.
.05 The rated discharge capacity of a rupture member or fus-
ible plug in pounds of air per minute shall be determined
by the following formulas:
0 = 0.6 Pld2
or
d = 1.29
P
.� 1
where C = minimum required discharge capacity, in
Ib of air per min
d = minimum diameter of bore of fusible plug or
internal diameter of inlet pipe to rupture
member in inches
For rupture members:
P1 = bursting pressure, equal to design working
pressure, except that for 13.7 the bursting
pressure equals 1.20 times design working
pressure, psig
For fusible plugs:
P1 = saturation pressure, corresponding to the
stamped temperature melting point of the
fusible plug or the critical pressure of the
refrigerant used, whichever is smaller,psig
.06 All pressure relief devices, not including fusible plugs,.
shall be directly pressure actuated.
.07 The size of discharge pipe from the pressure -relief device
shall be not less than the size of the relief device outlet.
The discharge from more than one relief device may be run into a
common header, the area of which shall be not less than the sum of
the areas of the pipes connected thereto.
(1)
.08 The length of discharge piping permitted to be installed
on the outlet of a relief valve, rapture member, or fus-
ible plug shall be determined as follows:
3 P d5/2 (2)
C =
or
L 172--
5
/2~
5 r C2L
d j
9P2
where C minimum required discharge capacity
in lb or air per min
d = internal diameter of pipe in in.
L = length of discharge pipe in ft
P = 0.25P1 (P1 is defined under
Equation 1.)
(See Table 7 for computations derived from the
preceding formula).
14.75.02 Positive displacement compressors operating above 15 pounds per
POSITIVE
DISPLACE- square inch gage and having a displacement exceeding 50 cubic
NENT COM-
PRESSORS feet per minute, shall be equipped by the manufacturer with a
pressure -relief device of adequate size and pressure setting to
prevent rupture of the compressor, located between the compressor
and stop valve on the discharge side. The discharge from such
relief device may be vented to the atmosphere or into the low
pressure side of the system.
TABLE 7. LENGTH OF DISCHARGE PIPING FOR RELIEF VALVES
OR RUPTURE I EP43ERS OF VA.RIOUS DISCHARGE CAPACITIES
Equiv.
length of Discharge capacity in lb of air per min (C)
discharge Standard wall iron pipe sizes, in.
pipe, ft.
(L) 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3
RELIEF DEVICE SET AT 25 PSIG (Pi)
50 0.81 1.6 2.9 5.9 8.7 16.3 25.3 43.8
75 0.67 1.4 2.4 4.9 7.2 13.3 20.9 35.8
100 0.58 1.2 2.1 4.2 6.2 11.5 18.0 30.9
150 0.47 0.95 1.7 3.4 5.0 9.4 14.6 25.3
200 0.41 0.8 1.5 2.9 4.4 8.1 12.6 21.8
300 0.33 0.67 1.2 2.4 3.6 6.6 10.5 17.9
RELIEF DEVICE SET AT 50 PSIG (Pi)
50 1.6 3.3 5.9 11.9 17.4 32.5 50.6 87.6
75 1.3 2.7 4.9 9.7 14.3 26.5 41.8 71.5
100 1.2 2.3 4.2 8.4 12.3 23.0 36.0 61.7
150 0.94 1.9 3.5 6.9 10.0 18.7 29.2 50.6
200 0.81 1.6 2.9 5.9 8.7 16.3 25.3 43.7
300 0.66 1.3 2.5 4.9 7.1 13.3 21.0 35.7
RELIEF DEVICE SET AT 75 PSIG (P1)
50 2.4 4.9 8.9 17.9 26.1 48.7 75.9 131.5
75 2.0 4.1 7.3 14.6 21.4 39.8 62.6 107.0
100 1.7 3.5 6.4 12.6 18.5 34.4 54.0 92.6
150 1.4 2.8 5.2 10.3 15.0 28.0 43.8 75.9
200 1.2 2.5 4.4 8.9 13.1 24.4 37.9 65.6
3`'0 0.9 2.0 3.7 7.3 10.7 19.9 31.5 53.5
RELIEF DEVICE SET AT 100 PSIG (Pi)
50 3.2 6.6 11.9 23.8 34.8 65.0 101.2 175.2
75 2.7 5.4 9.7 19.4 28.6 53.0 83.6 143.0
100 2.3 4.6 8.5 16.8 24.6 45.9 72.0 123.6
150 1.9 3.8 6.9 13.7 20.0 37.4 58.4 101.2
200 1.6 3.3 5.9 11.9 17.5 32.5 50.6 87.6
300 1.3 2.7 4.9 9.7 14.2 26.5 42.0 71.4
RELIEF DEVICE SET AT 150 PSIG (P1)
50 4.9 9.9 17.9 35.7 52.3 97.5 151.8 262.8
75 4.0 8.1 14.6 29.2 42.9 79.5 125.4 214.5
100 3.5 6.9 12.7 25.2 36.9 68.9 108.0 185.4
150 2.8 5.7 10.4 20.6 30.0 56.1 87.6 151.8
200 2.4 4.9 8.9 17.8 26.2 48.7 75.9 131.4
300 1.9 4.0 7.4 14.6 21.1 39.7 63.0 107.1
1
Equiv.
length of Discharge capacity in ib of air per min (C)
discharge Standard wall iron pipe sizes, in.
piper ft
(L) 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3
RELIEF DEVICE SET AT 200 PSIG (P1)
50 6.5 13.2 23.8 47.6 69.7 130.0 202.4 350.4
75 5.3 10.8 19.4 38.9 57.2 106.0 167.2 286.0
100 4.6 9.2 16.9 33.6 49.2 91.8 144.0 247.2
150 3.8 7.6 13.8 27.4 40.0 74.8 116.8 202.4
200 3.2 6:5 11.8 23.8 34.9 64.9 101.2 175.2
300 2.6 5.3 9.8 19.4 28.4 52.9 84 142.8
RELIEF DEVICE SET AT 250 PSIG (P1)
50 8.1 16.5 29.8 59.5 87.1 162.5 253.0 437.0
75 6.7 13.5 24.3 48.6 71.5 132.5 209.0 357.5
100 5.8 11.6 21.2 42.0 61.6 114.8 180.0 309.0
150 4.7 9.5 17.3 34.3 50.0 93.5 146.0 253.0
200 4.1 8.2 14.8 29.7 43.7 81.2 126.5 219.0
300 3.3 6.7 12.3 24.3 35.5 66.2 105.0 178.5
RELIEF DEVICE SET AT 300 PSIG (P1)
50 9.7 19.8 35.7 71.4 104.5 195.0 303.6 525.6
75 7.9 16.2 29.1 58.3 85.8 159.0 250.8 429.0
100 6.9 13.9 25.4 50.4 73.9 137.7 216.0 370.8
150 5.6 11.3 20.7 41.1 60.0 112.2 175.2 303.6
200 4.9 9.8 17.8 35.6 52.4 97.4 151.8 262.8
300 3.9 7.9 14.7 29.1 42.6 79.4 126.0 214.2
•
14.75.03 .01 BASIS OF RULES: The rules of this section are based
PRESSURE
VESSELS upon the rules, given in Paragraphs UG -
125 to UG -134, inclusive, of Section VIII of the 1950 Edition
of the ASIE Boiler Construction Code, with such additional
restrictions as are necessary for control of refrigerants.
.02 CAPACITY EXCEEDING 5 CUBIC FEET: : Each pressure vessel
containing liquid re-
frigerant having an inside diameter exceeding 6 inches and a
gross capacity exceeding 5 cubic feet, except as specified in
Sub -section J4.75.03.04, and which can be shut off by valves
from all other parts of a refrigerating system, shall be pro-
tected by an approved pressure relief valve in paralled with a
rupture member, or a second approved pressure relief valve.
Each valve or rupture member shall be of sufficient capacity to
prevent the pressure from rising morn than 10 percent above the
design working pressure. In cases where large pressure vessels
containing liquid refrigerant, except as specified in Sub -section
14.75.03.04, require the use of two or more pressure relief
devices in parallel to obtain the capacity required under the
provisions of Sub -section J4.7.03.05, the battery of pressure
relief devices shall be considered as a unit.
.03 CAPACITY 5 CUBIC J ET OR LESS: Each pressure vessel con-
taining a liquid refrigerant
and having a, gross capacity of 5 cubic feet or less, except as
specified in Sub -section 14.75.03.04, and which can be shut off
by valves from all other parts of a refrigerating system, shall
be protected by a pressure -relief device, or fusible plug. This
Shall not apply to vessels having an inside diameter of 6 inches
f
or less listed individually or as a part of refrigeration equi-
pment by an approved nationally recognized testing laboratory
having a follow-up inspection service. If a fusible plug, is
used, the ultimate bursting pressure of the vessel so protected
shall be at least 2 1/2 times the refrigerant saturation pressure,
psig, corresponding to the stamped temperature on the fusible
plug, or at least 2 1/2 times the critical pressure of the re-
frigerant used, whichever is the smaller. A fusible plug is
permitted only on the high side of a refrigerating system.
.04 EVAPORATOR USE: Pressure vessels used as, or as part of,
evaporators, which are insulated or in-
stalled in an insulated space, and which can be shut off by
valves from all other part- of a refrigerating system, shall
not be required to comply with the provisions of Sub -sections
34.22.03.02 and 14.75.03.03.
.05 RELIEF DEVICE CAPACITY: The minimum required rated dis-
charge capacity of the pressure -
relief device or fusible plug for a refrigerant -containing vessel
shall be determined by the following formula:
(3)
C=fDL
where C ., minimum required discharge capacity of the relief
device in lb or air per min
D .= outside diameter of the vessel in ft
L = length of the vessel in ft
f = factor dependent upon kind of refrigerant, as follows:
-50-
Kind of refrigerant Value of f
Anmonia
Freon -12 and Freon -22
All other refrigerants
0.5
1.6
1.0
.06 PRESSURE RELIEF DEVICE SETTING: All pressure relief
devices shall be set
to start to funtion at a pressure not to e;:ceed the design
working pressure of the vessel as determined by the manufacturer
and stamped on the vessel or system.
.07 RUPTURE DEVICE S.ETTIHG : Rupture :embers used in lieu of,
or in series with, a relief valve
shall function at a pres:-ure not to exceed the design working
pressure of the vessel, and the conditions of operation shall
conform to the requirements of Section VIII of the 1950 edition
of the ASNE Boiler Construction Code.. Rupture members used in
parallel with pressure relief valves on refrigerant containing
vessels shall function at a pressure not to exceed 20 percent
above the design working pressure of the vessel.
.08 MARKING OF RELIEF DEVICES: All pressure -relief valves for
refrigerant -containing vessels
shall 'ce set and sealed by the manufacturer. Each relief valve
shall be narked by the manufacturer with the data reouired in
Paragraph UG -129 (a) of Section VIII of the 1950 Edition of the
ASI\E Boiler Construction Code. Each rupture member for refri-
gerant -containing pressure vessels shall be marked with the
—51—
x+.75.04
DISCHARGE
OF RELIEF
DEVICES
11+.75.05
AMMONIA
DISCHARGE
14. 2.06
SULPHUR
DIOXIDE
DISCHARGE
information required in Paragraph UG -129 (d) of Section VIII
of the 1950 Edition of the AS1E Boiler Construction Code.
The discharge from all relief devices on systems containing
more than 6 pounds of refrigerant, other than systems containing
Group 1 refrigerants in quantities less than shown in Table 1,
74.69.03.01, shall 'oe to the outside of the building in an app-
roved manner; pressure -relief devices may discharge into the
low side of the system provided the relief devices are of a type
not appreciably affected by back pressures and provided the low
side of the system is equipped with relief devices vented to the
outside of the building in an approved manner.
Where ammonia is used, the discharge may be into a tank of water
which shall be used for no purpose except ammonia absorption. At
least 1 gallon of fresh water shall be ~provided for each pound
of ammonia in the system. The water used shall be prevented from.
freezing without the use of salt or chemicals. The tank shall 'oe.
substantially constructed of not less than 1/8 inch or No. 11
U.S. gage iron or steel. Ido horizontal dimension of the tank
shall be greater than one-half the height. The tank shall have
hinged cover, or, if of the enclosed tyre, shall have a vent hole
at the top. All pipe connections shall be through the top of
the tank only. The discharge pipe fro:: the pressure -relief valves
shall discharge the ammonia in the center of the tank near the
bottom.
Where sulphur dioxide is used, the discharge may be into a tank
of absorptive brine which shell 'oe used for no purpose except suh
phur dioxide absorption. There shall be 1 gallon of standard dich-
romate brine ( 2 1/2 pounds sodium dichromate per gallon of water)
for each pound of sulphur dioxide in the system. Brines made with
-52-
•
•
•
caustic scda or soda ash may be used in place of sodium dich-
romate, provided the quantity and strength give the equivalent
sulphur dioxide absorbing power. The tank shall be substantially
constructed of not less than 1/8 inch or No. 11 U. S. gage
iron or steel. The tank shall have a hinged cover, or, if of
the enclosed type, shall have a vent hole at the top. All pipe
connections shall be through the top of the tank only. The
discharge pipe from the pressure -relief valve shall discharge
the sulphur dioxide in the center of the tank near the bottom.
53
OP
•
]x+.76.01
GEkERAL
CHAPTER 76
FIELD TESTS
Every refrigerant—containing part of every system that is
erected on the premises, except compressors,condensers, eva—
porators, safety devices, pressure gages, and control mechanisms,
that are factory tested, shall be tested and proved tight after
complete installation, and before operation, at not less than
the minimum refrigerant leak field test pressures shown in
Table 6.
.01 For refrigerants not listed in Table 6 the test pressure for
the high pressure side shall be not less than the saturated
vapor pressure of the refrigerant at 150 F. The test pressure
for the low pressure side shall, be not less
vapor pressure of the refrigerant at 110 F.
the test pressure be less than 30 psig.
.02 When a compressor is used as a booster to obtain a low
pressure and discharges into the suction line of another
system, the booster compressor is considered a part of the low
side, and values listed under the low side column in Table 6
shall be used for both high and low side of the booster com—
pressor proviced that a low pressure stage compressor of the
positive disniacement type shall have a pressure relief valve.
.03 In field testing systems using nonpositive displacement
compressors, the entire system shall be considered for
field test purposes as the low side pressure.
than the saturated
In no case shall
TABLE 6. Minimum Refrigerant Leak Field Test Pressures
Refrigerant name
Minimum field
refrigerant leak
test pressures, psig
High Low
pres- pres-
Chemical sure sure
Formula side side
Ammonia NH3 300 150
Butane C4H10 95 50
Carbon dioxide 002 1500 1000
Dichlorodifluoromethane
(Freon -12) CC12F2 235 140
Dichloroethylene C2H2C12 30 30
Oichloromethane (Carrene No. 1)
(Methylene chloride) CH2C12 30 30
,'ichloromonofluoromethane
;peon -21) CHC 12F 70 40
D .chlorotetrafluoroethane
:Freon -114) C2C12F4 50 50
f thane C2H6 1200 700
P,thyl chloride C2H5C1 60 50
- „iylene C2R/ 1600 1200
:isobutane (CH3)3CH 130 70
Methyl c'floride CH3C1 210 120
Methyl formate HC00CH3 50 50
Monochlordifluoromethane CHC1F2 300 150
(Freon -22)
Propane C3Hg 300 150
Sulphur dioxide SO2 170 85
Trichloromonofluoromethane
(Freon -11) CC13F 30 30
Tri chlorotrifluoroethane
(Freon -113)
C2C13F3
30 30
-55-
1 4.76.02 No oxygen or any combustible gas or combustible mixture of gases
TESTI7G
'TEDIUM shall be used within the system for testing.
14.76.03 A dated declaration of test should be provided for all systems
POST I NG
OF TESTS containing 50 pounds or more of refrigerant where required 'oy
Sub -section 14.75.01. The declaration should be mounted in a
frame, protected by glass, and posted in the machinery room and
should give the name of the refrigerant and the field refrige-
rant leak test pressures applied to the high side and the low
side of the system. The declaration of test should be signed
by the installer and, if an inspector is present at the tests,
he should also sign the declaration. When requested, copies of
this declaration shall ce furnished to the enforcing authority.
-56-
et 1
•
•
CHAPTTA 77
GEPERAL REQUflEi Er?TS
14.77.01 .01 SIGNS REQUIRED: Each refrigerating system erected on the
SIGNS
premises shall be provided with an easily
legible permanent sign securely attached and easily access-
ible, indicating thereon the name and address of the installer,
the kind and total number of pounds of refrigerant required in
the system for normal operations, and the refrigerant leak field
test pressure applied.
.02 PETAL SIGNS RE'lUIRED: Systems containing more than 100
pounds of refrigerant shall be pro-
vided with metal signs having letters not less than 1/2 inch in
height designating the main shut-off valves to each vessel, main
steam or electrical control, remote control switch, and pressure
limiting device.. On all exposed high pressure and low pressure
piping in each room where installed outside the machinery room,
shall be signs, as specified above, with the name of the refri-
gerant and the letters "HP" or "LP".
.03 NEW SIGNS REQUIRED: When the kind of refrigerant is changed
as provided in Section 111.77.03, a new
sign shall be installed as required in Sub -sections 14.77.01.01
and 11+.77.01.02, indicating that a substitution has been made,
and providing the same information concerning the new refrigerant
as was required for the original refrigerant..
14.77.02 When refrigerant is added to a system, except a unit system
CHARGING
AND DIS- requiring less than 6 pounds of refrigerant, it shall be charged
CHARGING
SYSTEMS into the law pres=ure side of the system. Any point on the down-
stream side of the main liquid line stop valve shall be considered
-57-
•
14.77.03
SUBSTITU-
TION OF RE-
RIGERANT
as part of the low pressure side when operating with said
stop valve in the closed position. Ho service container shall
be left connected to a system except while charging or with-
drawing refrigerant. Refrigerants withdrawn from refrigerating
systems shall be transferred to approved containers only. No
refrigerant shall be discharged to a sewer. Containers used
for refrigerants withdrawn from a refrigerating system shall be
carefully weighed each time they are used for this purpose, the
containers shall not be filled in excess of the permissible
filling weight for such containers and such refrigerants as are
prescribed in the pertinent regulations of the Interstate
Commerce Commission.
Substitution of a different kind of refrigerant than that for
which it was designed shall not be made in any system without
approval of the Chief Building Inspector, the owner and/or user,
and the manufacturer of the equipment. Due consideration shall
be given to all safety requirements, including:
.01 The effects of the substituted refrigerant on materials
in the system;
.02 The possibility of loading the receiver beyond 80 percent
of its liquid capacity;
.03 The liability of exceeding motor horsepower, design work-
ing pressure, or any other element that would violate any
of the provisions of this Code;
.04 The proper size of refrigerant controls;
.05 The effect on the operation and setting of safety devices;
.06 The possible hazards created by mixture of the original
and the substituted. refrigerant;
.07 The restrictions placed on the substitute refrigerant by
this Code.
-58-
•
14.77.04
RE FRIG'R.-
ANT STOR-
AGE
14.77.05
GAS
I (ASKS
14.77.06
MAINTEN-
ANCE OF
SYSTEMS
No refrigerant supply shall be stored other than in an approved
machinery room. Storage in a machinery room of refrigerant in
excess of that contained in the system, shall not exceed 20
percent of the system capacity, nor shall it exceed 300 pounds.
i.Then refrigerant is so stored it shall be contained in only
approved storage containers.
One gas mask or helmet shall 'oe provided at a location con-
venient to the machinery room when an amount of a Group 2
refrigerant between 100 and 1000 pounds, inclusive, is employed.
If more than 1000 pounds of a Group 2 refrigerant are employed,
at least two masks or helmets shall be provided. Only complete
helmets or masks marked as approved by the Bureau of Mines of the
United States Department of the Interior and suitable for the
refrigerant employed shall be used and they shall be kept in
a suitable cabinet immeciately outside the machinery room or
other aprroved accessible location. Canisters or cartridges
of helmets or masks shall be renewed i -(mediately after having
been used or the seal broken and, if unused, must be renewed
at least once every two years. The date of filling shall be
marked thereon.
All. refrigerating systems shall be maintained by the user in a
clean condition, free from accumulations of oily dirt, waste, and
other debris, and shall be kept readily accessible at all times.
Pressure gages should be checked for accuracy prior to an air
test and immediately after ever* occasion of unusually high
pressure, either by comparison with master gages or by setting
the pointer as determined by a dead weight pressure gage tester.
- 59-
* F
•
• •
r w
•
•
s
1+.77.07 It shall be the duty of the person in charge of the premises
OPER[TION
OF SYSTEM on which a refrigerating system containing more than 50 pounds
of refrigerant is installed, to place a card conspicuously as
near as practicable to the refrigerant compressor giving direc-
tions for the oreration of the system, including precautions
to be observed in case of a breakdown or leak as follows:
.01 Instruction for shutting down the system in case of emer-
gency;
.02 The name, address, and day and night telephone numbers
for obtaining service;
.03 The name, address, and telephone number of the municipal
inspection department having jurisdiction, and instructions
to notify said department immediately in case of emergency.
SECTION 2: That this ordinance shall go into effect immediately
upon its passage and posting as required by law.
PASSED and ADOPTED this 25th day of March, A. D. 1953.
ATTEST:
City Clerk
let reading - March 11, 1953
2nd reading - March 11, 1953
3rd reading - March 25, 1953
POSTED - March 26, 1953
- 61 -
Mayor
STATE OF FLORIDA
COUNTY OF DADE:
I, C. W. TOMLINSON, City Clerk in and for the
City of Miami Beach, Florida, do hereby certify that Ordinance
No. 1042, entitled: "AN ORDINANCE AMENDING SECTION 2 OF
ORDINANCE NC. 592 OF THE CITY OF MIAMI BEACH, FLORIDA, KNOWN
AND DESIGNATED AS THE 'MIAMI BEACH BUILDING CODE', BY ADDING
THERETO, AT THE END THEREOF, AN ADDITIONAL PART TO BE KNOWN
AS 'PART XIV'", having been passed and adopted by the City
Council of the City of Miami Beach, Florida, has been posted
by me in three conspicuous places in the City of Miami Beach,
one of which was at the dcor of the City Hall in said City on
the 26th day of March, A. D. 1953, and that said Ordinance
remained posted for a period of at least thirty days in accord-
ance with the requirements of the City Charter of the said
City of Miami Beach.
IN WITNESS WHEREOF I have hereunto set my hand and
affixed the official seal of the City of Miami Beach, Florida,
on this the 6th day of May, A. D. 1953.
City Clerk
z
H
0
0
i-1
ORDINANCE NO.
Air Conditioning Ccde
• es
t 't \ t
ti