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FT600 (Cast Steel) 3" - 4"

FT600 Float & Thermostatic Steam Trap

PROCESS: FT600 Series (size 3"- 4") steam traps with Cast Steel Body and in-line repairable connectors were specifically designed for removing condensate and air from higher pressure steam applications or where steel bodies are specified. They are typically used in chemical plants and petrochemical refineries on re-boilers, heat exchangers, and other critical process applications. The excellent air-handling capability of float and thermostatic traps make them a better choice than bucket traps for applications requiring quick system start-up. Maximum steam pressure is 450 PSIG. These models contain an open orifice air vent. If a thermostatic air vent is required, contact factory.

Size Connection PMO (PSIG) Max Capacity
3" - 4" NPT,SW,FLG(150,300,600) 450 290,000 lbs/hr
ModelSizeTypeBody MaterialMax PMO (psig)Max Capacity @ Max PMO (lb/hr)
FT600-450-19-N3"NPTCarbon Steel450290000
FT600-450-19-SW3"Socket WeldCarbon Steel450290000
FT600-450-19-F1503"150# FLGCarbon Steel450290000
FT600-450-19-F3003"300# FLGCarbon Steel450290000
FT600-450-19-F6003"600# FLGCarbon Steel450290000
FT600-450-20-F1504"150# FLGCarbon Steel450290000
FT600-450-20-F3004"300# FLGCarbon Steel450290000
FT600-450-20-F6004"600# FLGCarbon Steel450290000
Product Overview
PROCESS:   FT600 (size 3"- 4") Series steam traps with Carbon Steel Body and in-line repairable connectors were specifically designed for removing condensate and air from higher pressure steam applications or where steel bodies are specified. They are typically used in chemical plants and petrochemical refineries on re-boilers, heat exchangers, and other critical process applications. The excellent air-handling capability of float and thermostatic traps make them a better choice than bucket traps for applications requiring quick system start-up. Maximum steam pressure is 450 PSIG. These models contain an open orifice air vent. If a thermostatic air vent is required, contact factory.
Features
• Investment cast steel body and cover with class 400 shell rating (670 PSIG @ 750 °F)
• Hardened stainless steel seat and disc for extended service life even at extreme temperatures and pressures
• Excellent air handling capability allows air to be discharged rapidly so steam can enter the system quickly during start-up
• In-line repairability is simplified by having all internals attached to the cover. Studded cover allows for easier removal of body.
• Welded stainless steel air vent resists shock from waterhammer. Live orifice air vent is available for superheated applications
• F&T traps discharge condensate immediately as it is formed (no condensate will back up into the system)
How It Works
Float and thermostatic traps contain a float and seat mechanism with a separate thermostatic element which work together to remove both condensate and air from the steam system. The float, which is attached to a valve, rises and opens the valve when condensate enters the trap. This allows the condensate to discharge. Air is discharged through the thermostatic air vent to the outlet side of the trap. Steam entering the trap causes the thermostatic element to expand, closing the air vent and trapping the steam.
Selection / Sizing / Capacities
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.


Dimension and Weights

* Chart is applicable for FT600 & FT601
Options
Live orifice air vent for superheated applications.
Installation and Maintenance
The trap must be installed upright and level for the float mechanism to operate properly. All internal components can be replaced while the steam trap remains connected to the piping (in-line repairable). Threaded studs are permanently installed into the cover assembly which greatly simplifies the removal and replacement of the body when servicing. Internal components include a high quality welded stainless steel thermostatic air vent and stainless steel seat and mechanism. The standard thermostatic air vent can be damaged by superheat; therefore, in applications with superheated steam, the thermostatic air vent should be replaced with a special “live orifice” air vent.