Average Service Life
Between Replacement
Type of Trap
or Repairs
Impact-operated traps
19 months
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2.11.23.1
Thermostatic Traps
Thermostatic traps shall conform to the requirements of ASTM F 1139 and
shall be installed in the return connection from each radiator and
elsewhere as indicated. Drip traps for mains, risers, and similar lines
shall be installed with a cooling leg of 1.50 m 5 feet of uncovered 20 mm
3/4 inch pipe. The capacity of traps shall be based on a pressure
differential of 15 kPa 2 psi. The traps shall be designed for a steam
working pressure of 100 kPa 15 psig but shall operate with a supply
pressure of approximately 15 kPa 2 psig. The traps shall be angle or
straight-through pattern with union inlet connections as indicated. The
trap bodies and covers shall be brass. Valve mechanisms and seats shall be
monel, stainless steel or hard bronze and shall be removable for servicing
or replacement.
2.11.23.2
Float-and-Thermostatic Traps
Float-and-thermostatic traps shall conform to the requirements of ASTM F
1139 and be designed for a steam working pressure of 100 kPa 15 psig but
shall operate with a supply pressure of approximately 34 kPa 5 psig. The
trap capacity shall be based on a pressure differential of 15 kPa 2 psig.
Each float-and-thermostatic trap shall have a cast iron body and shall be
provided with a hard bronze, monel, or corrosion-resisting steel valve seat
and mechanism, an open- or closed-type float of brass or equally
corrosion-resistant metal, and a corrosion-resisting steel thermostatic air
vent, all of which can be easily removed for inspection or replacement
without disturbing the piping connections. The inlet to each trap shall
have a brass or stainless steel strainer, either as an integral part of the
trap or as a separate item of equipment.
2.11.23.3
Inverted Bucket Traps
Inverted bucket traps shall conform to the requirements of ASTM F 1139 and
be designed for a steam working pressure of 100 kPa 15 psig but shall
operate with a supply pressure of approximately 35 kPa 5 psig. Each trap
shall have a cast iron body and shall have a corrosion-resistant steel
valve and seat and a brass or corrosion-resistant steel bucket, all of
which can be easily removed for inspection or replacement without
disturbing the piping connections. The inlet to each trap shall have a
brass or stainless steel strainer, either as an integral part of the trap
or as a separate item of equipment.
2.12
ELECTRICAL EQUIPMENT
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NOTE: Select standard efficiency for motors used
less than 750 hours per year and high efficiency for
motors used over 750 hours per year. The efficiency
of each motor will be indicated in the equipment
schedules.
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SECTION 15569A
Page 55
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