2.11.5
Refrigerant Relief Valve/Rupture Disc Assembly
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NOTE: ASHRAE 15 requires refrigeration systems to
be protected with a pressure-relief device that will
safely relieve pressure due to fire or other
abnormal conditions. A relief valve/rupture disc
assembly is the optimum solution. The rupture disc
will provide visual indication of a release while
also providing immediate shutoff once a safe
pressure is achieved.
Designer will indicate on the drawings the location
of each new relief valve/rupture disc assembly as
well as the routing and size of corresponding
pressure-relief piping. The routing and size of new
pressure-relief piping will be per ASHRAE 15.
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The assembly shall be a combination pressure relief valve and rupture disc
designed for refrigerant usage. The assembly shall be in accordance with
ASME BPVC SEC VIII D1 and ASHRAE 15. The assembly shall be provided with a
pressure gauge assembly which will provide local indication if a rupture
disc is broken. Rupture disc shall be the non-fragmenting type.
2.11.6
Refrigerant Signs
Refrigerant signs shall be a medium-weight aluminum type with a baked
enamel finish. Signs shall be suitable for indoor or outdoor service.
Signs shall have a white background with red letters not less than 13 mm
0.5 inches in height.
2.11.6.1
Installation Identification
Each new refrigeration system shall be provided with a refrigerant sign
which indicates the following as a minimum:
a.
Contractor's name
b.
Refrigerant number and amount of refrigerant.
c.
The lubricant identity and amount.
d.
Field test pressure applied.
2.11.6.2
Controls and Piping Identification
Refrigerant systems containing more than 50 kg 110 lb of refrigerant shall
be provided with refrigerant signs which designate the following as a
minimum:
a.
Valves or switches for controlling the refrigerant flow [, the
ventilation system,] and the refrigerant compressor.
b.
Pressure limiting device(s).
SECTION 15700A
Page 46
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