What is the difference between the FT450 model variants (4.5, 10, 14, 21, 32)?

The number indicates the maximum operating pressure in barg. FT450-4.5 is rated for 65 psig, while FT450-32 handles up to 465 psig. Select based on your system's operating pressure.

Can the FT450 handle superheated steam?

Yes, with the optional bimetal air vent fitted on models 4.5, 10, 14, 21, and 32. The trap can operate at temperatures up to 750°F (400°C) at pressures below 505 psig.

How is the trap installed in the pipeline?

Install below the equipment drainage point with a collecting leg before the trap. The float arm must be horizontal with the float rising and falling vertically. Flow direction is marked on the body. A pipeline strainer should be fitted upstream.

Can the trap be serviced without removing it from the piping?

Yes. The FT450 is designed for in-line maintenance — internals can be accessed by removing the cover without disturbing pipe connections. Isolate from supply and return lines before servicing.

What spare parts are available for the FT450?

Spirax Sarco offers valve mechanism kits (with float), air vent kits (standard and high-pressure variants), gasket kits, and individual ball float assemblies for 1-1/2" and 2" sizes.

SPIRAX SARCO · STEAM TRAPS

Spirax Sarco FT450 Cast Steel Float & Thermostatic Steam Trap

Name: Spirax Sarco FT450 Cast Steel Float & Thermostatic Steam Trap
Brand: Spirax Sarco

Spirax Sarco FT450 float & thermostatic steam trap for process equipment. PMO up to 465 psig. Available at PC Engineering India.

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Spirax Sarco FT450 Steam Trap Front View

Overview

The Spirax Sarco FT450 is a mechanical ball float type steam trap designed for continuous condensate discharge at steam temperature. It replaces the earlier FT32 model and is engineered for reliable operation in demanding industrial process applications.

The trap operates using a stainless steel ball float that modulates to discharge condensate continuously. A separate internal balanced pressure thermostatic air vent releases non-condensible gases, ensuring efficient heat transfer in connected equipment. The cast steel body with stainless steel internals provides durability in high-pressure steam systems.

This float and thermostatic steam trap is suitable for applications requiring precise condensate removal without steam loss, particularly where modulating temperature control valves are used.

Key Features

Continuous condensate discharge at steam temperature via modulating ball float mechanism
Integral balanced pressure thermostatic air vent for automatic air removal
Cast steel body (ASTM A216 WCB) with full stainless steel internals
Maximum operating pressure up to 465 psig (32 barg)
Available in sizes 3/4" to 2" with NPT, socket weld, or flanged connections
In-line serviceable — internals removable without disturbing piping
Optional bimetal air vent for superheat applications up to 750°F (400°C)
Erosion deflector on 1-1/2" and 2" models for extended service life

Specifications

Parameter	Value
Model	FT450 (Replaces FT32)
Sizes	3/4", 1", 1-1/2", 2"
Body Material	Cast Steel ASTM A216 WCB
Internals	Stainless Steel
Connections	NPT, Socket Weld (ANSI B16.11), Flanged (ANSI 150, 300, 600 RF)
PMO — FT450-4.5	65 psig (4.5 barg)
PMO — FT450-10	145 psig (10 barg)
PMO — FT450-14	200 psig (14 barg)
PMO — FT450-21	300 psig (21 barg)
PMO — FT450-32	465 psig (32 barg)
PMA (Max Allowable Pressure)	535 psig at 650°F (37 barg at 342°C)
TMA (Max Allowable Temperature)	750°F at 0–505 psig (400°C at 0–34 barg)
Cover Gasket	Exfoliated Graphite
Weight (NPT/SW)	18–68 lb depending on size
Weight (Flanged)	23.8–82 lb depending on size

Applications

The Spirax Sarco FT450 steam trap is used across a wide range of industrial process equipment:

- Heat exchangers and shell-and-tube units - Unit heaters and air heating coils - Process vessels with modulating temperature control valves - Steam main drip stations - Jacketed kettles and reactors - Drying cylinders and pressing equipment

Typical industries include chemical processing, pharmaceuticals, food & beverage, textiles, and paper manufacturing.

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Frequently Asked Questions

Get a Quote

Contact PC Engineering for pricing, availability, and technical support for the Spirax Sarco FT450 Float & Thermostatic Steam Trap. Call us or fill in our inquiry form — our engineers will respond within 24 hours.

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