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8200 N. Austin Ave Morton GroveIL 60053USA Tel 847 966-3700Fax 847 983-5954
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Specifications
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Steam Trap Suggested Specifications
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Piping Details
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Thermostatic Traps
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Float & Thermostatic Traps
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Inverted Bucket Traps
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Thermodisc Traps
1.0 PIPING DETAILS
1.1 Furnish and install steam traps on all steam equipment of the type shown on the detail drawings. Float and
Thermostatic drip traps shall also be installed at the end of all steam mains, at all risers, ahead of all steam
temperature and pressure regulators, and at least every 300 feet along the length of the steam mains.
1.2 All steam traps shall be installed at least 15 inches below the equipment condensate outlet. A capped dirt
pocket and Y type strainer with a blow down valve installed on the drain connection, shall be installed in the
piping ahead of the trap.
1.3 Shut off valves shall be installed in the trap inlet and outlet piping. A test valve shall be installed in the trap
discharge piping to test the trap operation.
1.4 On traps having two outlet tappings the test valve shall be installed in the second trap outlet.
1.5 On traps without the second outlet trap the test valve shall be installed in a tee fitting between the trap outlet
and the shut off valve.
1.6 Unions shall be installed at both sides of the trap to allow for removal.
1.7 ( Exception, Thermostatic traps used on steam radiation may be installed directly on the outlet tapping
without the need for strainers or shut off valves.)
1.8 When traps discharge into wet return line, or have a lift in the discharge piping, a check valve shall be
installed in the trap discharge line between the trap outlet and the shut off valve.
1.9 Lifts will not be allowed in the trap discharge piping for equipment having a modulating temperature
regulator.
2.0 THERMOSTATIC TRAPS
2.1 Thermostatic traps shall be installed where indicated by equipment location and typical detail drawings.
2.2 Thermostatic traps shall be of the balanced pressure design capable of following the steam saturation curve
from 25" Hg. vacuum up to design pressure.
2.3Thermostatic traps up to 125 psig, shall have brass bodies and stainless steel seats.
2.4 The inlet connection shall be equipped with a union type tailpiece to allow easy removal.
2.5 Thermostatic traps up to 15 psig shall have net ratings in accordance with SHEMA.
2.6 Thermostatic traps operating above 15 psig shall have a 2 X capacity safety factor.
3.0 FLOAT & THERMOSTATIC TRAPS
3.1 Float and Thermostatic traps shall be installed where indicated by equipment location and typical detail
drawings.
3.2 Float and thermostatic traps shall have cast iron bodies and covers rated a minimum of 175 psig. Floats,
linkages, pins, seats and thermostatic elements must be stainless steel to resist damage from water hammer.
3.3 The trap seat pressure rating must be equal to or greater than the steam supply to the equipment.
3.4 Float and Thermostatic traps shall have a 1.5 X capacity minimum safety factor to allow for start up loads.
The trap capacity must be selected at the minimum possible differential pressure.
3.5 When used on equipment having a modulating temperature regulator the trap capacity shall be determined
at 1/2 psi differential pressure. The trap shall be installed at least 15 inches below the equipment to be drained
which will provide 1/2 psi static head at the trap inlet. The trap discharge piping
must drain by gravity to a vented dry return line.
4.0 INVERTED BUCKET TRAPS
4.1 Inverted Bucket traps shall be installed where indicated by equipment location and typical detail drawings.
4.2 Inverted Bucket traps shall have cast iron bodies and covers rated a minimum of 250 psig. Buckets,
linkages, pins, and seats must be stainless steel to resist damage from water hammer.
4.3 The trap seat pressure rating must be equal to or greater than the steam supply to the equipment.
4.4 Inverted Bucket traps shall have a 2 X capacity minimum safety factor to allow for start up loads. The trap
capacity must be determined at the minimum possible differential pressure.
4.5 When used on equipment having a modulating temperature regulator the trap capacity shall be determined
at 1/2 psi differential. The trap shall be installed at least 15 inches below the equipment to be drained which will
provide 1/2 psi static head at the trap inlet. The trap discharge piping must drain by gravity to a vented dry
return line.
5.0 THERMODISC TRAPS
5.1 Thermodisc traps shall be installed where indicated by equipment location and typical detail drawings.
5.2 Thermodisc traps shall have stainless steel bodies and caps rated a minimum of 600 psig. Disc and seats
must be hardened stainless steel. Disc and seats must be field replaceable.
5.3 Thermodisc traps used in the pharmaceutical and food process industry shall have Teflon gaskets. Units
with Teflon gaskets will be rated for 250 psig.
5.4 Thermodisc traps shall have a 1.2 X capacity minimum safety factor to allow for start up loads. The trap
capacity must be determined at the minimum possible differential pressure.
6.0 All steam traps shall be manufactured in the USA and shall be ITT Hoffman, Chicago, Il or approved equal.
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