circular washers shall be provided under all bolt heads and nuts.
2.5.5
Pipe Hangers
Hangers shall be listed in UL Fire Prot Dir or FM P7825a and FM P7825b and
of the type suitable for the application, construction, and pipe type and
size to be supported.
2.5.6
Valves
2.5.6.1
Control Valve and Gate Valve
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NOTE: A control valve is required for control of
each individual sprinkler riser. The type of such
valves should be either the OS&Y or wall type
indicator post. Where multiple risers are supplied
from a single water service, riser control valves of
the OS&Y type should be located in a valve room with
exterior access. For more guidance on arrangement
of sprinkler control valves, refer to NFPA 13,
Appendix A.
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Manually operated sprinkler control valve and gate valve shall be outside
stem and yoke (OS&Y) type and shall be listed in UL Bld Mat Dir or FM P7825a
and FM P7825b.
2.5.6.2
Check Valve
Check valve 50 mm 2 inches and larger shall be listed in UL Bld Mat Dir or
FM P7825a and FM P7825b. Check valves 100 mm 4 inches and larger shall be
of the swing type with flanged cast iron body and flanged inspection plate,
shall have a clear waterway and shall meet the requirements of MSS SP-71,
for Type 3 or 4.
2.6
DRY PIPE VALVE ASSEMBLY
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NOTE: If sprinkler system air capacity does not
require the provision of a quick opening device,
delete the last sentence.
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The dry pipe valve shall be a latching differential type listed in UL Fire
Prot Dir or FM P7825a and FM P7825b and shall be complete with trim piping,
valves, fittings, pressure gauges, priming water fill cup, velocity drip
check, drip cup, and other ancillary components as required for proper
operation. The assembly shall include a quick-opening device by the same
manufacturer as the dry pipe valve for systems over 1890 liters 500 gallons
in capacity.
2.7
SUPERVISORY AIR SYSTEM
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NOTE: Show the power supply to the air compressor
and to the low air pressure alarm device on the
drawings.
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SECTION 13935A
Page 18
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