2.3.5
Flash Tank
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NOTE: If no flash tanks are required for the
project, this paragraph will be deleted.
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Tank shall be sized and installed as indicated and shall be of welded
construction utilizing black steel sheets not less than [_____] mm inches
thick. Tank shall be provided with a handhole and with tapping for the
condensate returns, drip lines, vent line, and condensate discharge line.
Discharge line shall be equipped with a float trap. Vent pipe shall be of
galvanized steel and fittings shall be of galvanized malleable iron. Vent
pipe shall be installed as indicated. Vent piping shall be flashed as
specified.
2.3.6
Steam Traps
2.3.6.1
Float Traps
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NOTE: Drawings shall indicate steam trap
capacities, working pressures, and differential
pressures.
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Capacity, working pressure, and differential pressure of the traps shall be
as indicated.
2.3.6.2
Float-and-Thermostatic Traps
Traps shall be designed for a steam working pressure of approximately 105
kPa 15 psig, but shall operate with a supply pressure of approximately 35
kPa 5 psig. Capacity of the traps shall be as indicated. Trap capacity
shall be based on a pressure differential of 2 kPa 1/4 psig. Each
float-and-thermostatic trap shall be provided with a hard-bronze, monel, or
stainless steel valve seat and mechanism and brass float, easily removable
for inspection or replacement without disturbing the piping connections.
Inlet to each trap shall have a cast-iron strainer, either an integral part
of the trap or a separate item of equipment.
2.3.6.3
Bucket Traps
Traps shall be inverted or vertical bucket type with automatic air
discharge. Traps shall be designed for a working pressure of 1.03 MPa 150
psig, but shall operate under a steam supply pressure of approximately 275
to 690 kPa 40 to 100 psig. Each trap shall have a heavy body and cap of
fine-grained, gray cast iron. Bucket shall be made of brass; the mechanism
of hard bronze; the valve and seat of stainless or monel; or each of
equivalent material. Traps shall be tested hydrostatically under a
pressure of 1.5 MPa 200 psig. Traps shall have capacities as indicated
when operating under the specified working conditions. Strainer shall be
provided on the inlet connection of each trap. Impact-operated traps,
impulse-operated traps, or thermodynamic traps with continuous discharge
may be installed in lieu of bucket traps, subject to approval.
Thermostatic traps designed for a steam working pressure suitable for the
application may be furnished in lieu of the traps specified above.
Thermostatic traps shall be equipped with valves and seats of stainless
steel, or monel metal, and shall have capacities based on a pressure
SECTION 15562A
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