SPIRAX SARCO · LIQUID DRAIN TRAPS
Spirax Sarco FA450 Steel Liquid Drain Trap – Float Operated Ball Float Trap
Spirax Sarco FA450 steel liquid drain trap for continuous drainage. 465 psig PMO, 750°F. Ideal for receiver & air line drainage. Buy from PC Engineering
Overview
The Spirax Sarco FA450 is a float-operated steel liquid drain trap designed for continuous, automatic drainage of liquids from gas or vapor systems. The trap responds directly to variations in liquid flow rate, ensuring thorough and reliable drainage without manual intervention.
The FA450 features a robust carbon steel body with stainless steel internals, making it suitable for high-pressure and high-temperature industrial applications. The ball float mechanism operates in a vertical plane, opening the valve proportionally to the incoming liquid load for efficient discharge.
This liquid drain trap is engineered for inline horizontal installation and allows complete internal servicing without disturbing piping connections. The 1-1/2" and 2" models feature double-seated valves; note that these may not shut tight under no-load conditions, though normal liquid load typically exceeds any residual leakage.
Key Features
- Float-operated ball float mechanism for continuous, modulating discharge
- Carbon steel body (ASTM A216 WCB) with stainless steel internals for durability
- Maximum operating pressure up to 465 psig (model and specific gravity dependent)
- Maximum operating temperature of 750°F (400°C)
- Horizontal inline installation with serviceable internals
- Available in NPT, socket weld (ANSI B16.11), and ANSI 150/300/600 flanged connections
- Optional 1/2" bottom drain for blowdown
- 1/2" NPT balance pipe connection for proper operation
Specifications
| Parameter | Value | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Model | FA450 | |||||||||
| Sizes | 3/4" to 2" (DN20 to DN50) | |||||||||
| Max. Operating Pressure (PMO) | Up to 465 psig (varies by model and liquid specific gravity) | |||||||||
| Max. Operating Temperature | 750°F (400°C) | |||||||||
| Pressure Shell Design (PMA) | 535 psig at 650°F / 505 psig at 750°F | |||||||||
| Body Material | Carbon Steel – ASTM A216 WCB | |||||||||
| Internals | Stainless Steel (AISI 431, 304, 420F) | |||||||||
| Ball Float & Lever | Stainless Steel – ASTM A240 Type 304 | |||||||||
| Cover Gasket | Stainless Steel Reinforced Exfoliated Graphite | |||||||||
| Connections | NPT (standard), SW to ANSI B16.11, ANSI 150/300/600 Flanges | |||||||||
| Balance Pipe Connection | 1/2" NPT | |||||||||
| Size | A (in/mm) | A1 (in/mm) | B (in/mm) | C (in/mm) | D (in/mm) | E (in/mm) | F (in/mm) | G (in/mm) | Weight NPT/SW | Weight Flanged |
| 3/4" (DN20) | 6.1 / 155 | 10.0 / 254 | 2.6 / 66 | 2.6 / 66 | 6.4 / 163 | 4.7 / 119 | 7.4 / 188 | 4.0 / 102 | 18.0 lb / 8.2 kg | 23.8 lb / 10.8 kg |
| 1" (DN25) | 6.5 / 165 | 10.4 / 264 | 4.5 / 114 | 3.3 / 84 | 8.2 / 208 | 6.3 / 160 | 9.2 / 234 | 5.8 / 147 | 28.0 lb / 12.7 kg | 33.0 lb / 15.0 kg |
| 1-1/2" (DN40) | 9.8 / 249 | 14.0 / 356 | 5.1 / 130 | 3.1 / 79 | 9.7 / 246 | 7.7 / 196 | 11.0 / 280 | 6.4 / 163 | 55.1 lb / 25.0 kg | 64.0 lb / 29.0 kg |
| 2" (DN50) | 11.8 / 300 | 16.0 / 406* | 5.5 / 140 | 3.6 / 91 | 9.9 / 251 | 7.7 / 196 | 11.5 / 292 | 6.5 / 165 | 68.0 lb / 31.0 kg | 82.0 lb / 37.3 kg |
Applications
- Receiver drainage in compressed air and gas systems - Air line drainage - Draining liquid from its vapor phase in process equipment - Condensate removal from gas separators and knock-out drums - Industrial gas processing and distribution systems - Any application requiring continuous liquid drainage from gases
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