STEAM TRAPS Introduction Steam Trap Selection Guidelines • DRIP Applications
Drip Applications The trap models in the chart below are appropriately sized for drip applications for the protection of steam mains and steam supply lines. Each trap is suitable for typical warm-up loads in properly insulated mains up to a minimum of 8” when installed every 150 to 200 feet. In addition to steam main pipe size, distance between traps, insulation quality, ambient temperatures and start-up condition should be considered. Consult factory representative if additional guidance is required.
Thermodynamic
Float & Thermostatic
Thermostatic
Inverted Bucket
Model
Size
Model
Size
Model
Size
Model
Size
Parallel Pipe Connection (Cast Iron)
Cast Iron
WFT-125 PMO=125
30 PSIG
3/4”
IB1031-150
1/2” 3/4”
PMO=150
In-Line Pipe Connection (Ductile Iron) FTT-145 PMO=145 1/2” • 3/4”
Non-Repairable TD600L & TD600LS 1/2” 3/4”
Stainless Steel
SIB150 PMO=150
1/2” 3/4”
Universal Quick-Change UFT450-145 PMO=145
Repairable
Repairable (Cast Iron)
Universal Quick-Change USIB450-150 PMO=150
TD700S
1/2” • 3/4”
WT2501
1/2” 3/4”
Universal Quick-Change UTD450LSM
125 PSIG
(Limited to 250 PSI)
In-Line Pipe Connection (Ductile Iron) FTT-225 PMO=225 1/2” • 3/4” Universal Quick-Change UFT450-225 PMO=225
Non-Repairable (Stainless Steel)
150 PSIG
150 PSIG
Cast Iron IB1032-250 PMO=250 1/2” • 3/4” Stainless Steel SIBH-250 PMO=250 1/2” • 3/4” Universal Quick-Change USIB450-250 PMO=250
WT2001
1/2” 3/4”
225 PSIG
Repairable (Stainless Steel)
NOTE: The WFT-125, FTT-145 and FTT-225 have adequate capacity for draining steam mains and steam supply lines. For pressures below 65 PSI, the WFT-075 or the FTT-065 can be used if a larger discharge orifice and increased capacity is required.
Non-Repairable TD600L & TD600LS 1/2” 3/4”
WT3001
1/2” 3/4”
250 PSIG
Universal Quick-Change UT450 (Limited to 450 PSI)
NOTE: IB Models up to a PMO of 250 shown above, have adequate capacity for draining steam mains and steam supply lines. On lower pressure systems, models with lower PMO ratings can be used if a larger discharge orifice and increased capacity is required.
Repairable
TD700HS
1/2” 3/4”
Universal Quick-Change UTD600LSM
600 PSIG
650 PSIG
Repairable
TD900S
1/2” , 3/4”
TD900LS (Light Loads)
900 PSIG
www.watsonmcdaniel.com •• Pottstown PA • USA • Tel: 610-495-5131
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