The maximum operating pressure (PMO) rating of model selected must meet or exceed the maximum steam pressure or the trap may not open. For example; the FT600-145 has a PMO of 145 psi. Condensate capacity (lbs/hr) of the trap is based on the differential pressure across the trap.
For drip applications, a (3/4)" FT600 size is sufficient to exceed warm-up loads with a 2X safety factor. The condensate loads (lbs/hr) for process applications are normally calculated at the maximum steam pressure; then an appropriate safety margin is applied in order to select a trap with sufficient capacity when operating at lower steam pressures. Reference full explanation of Safety Load F actors in Steam Traps Introduction section.
When a temperature control valve regulates the flow of steam to the process equipment (Heat Exchanger) being drained of condensate, it is recommended to select a trap with a PMO that exceeds the inlet steam pressure to the temperature control valve. This assures that under all operating conditions, the steam pressure will not exceed the PMO of the trap.
For Example:
Process application has a maximum steam inlet pressure of 100 psi, a maximum condensate load of 2,500 lbs/hr and is discharging to a condensate return line with a possible back pressure of 20 psig. Δ P = 100-20 = 80 PSI
To select trap:
If the Safety Load Factor is chosen to be 2X max capacity at max differential pressure, then Trap should be selected based on 5,000 lbs/hr (2,500 x 2 = 5,000) at 80 PSI differential pressure with a PMO in excess of 100 PSIG
Selection :
FT600-145-16-N , PMO=145 PSIG, 1 1/2 ” NPT with a condensate capacity of 9,900 lbs/hr at 80 PSI differential pressure.
Connection Codes: ( N =NPT, SW =Socket Weld, F150 =150# FLG, F300 =300# FLG, F600 =600# FLG)
* Cold water capacities are to be used when the trap is used as liquid drain trap.
Note: For liquid drain trap applications, please specify "liquid drain trap" when ordering.
