Wright-Austin Type ST Cast-Iron Separator with Integral Float Trap, 1-1/2 and 2-1/2 in. NPT
Wright-Austin has been building these since before most of the compressed air industry existed, and the Type ST is the version that does not need a separate trap hung off the bottom. Separator and float trap share one cast-iron body. Air spins, liquid drops out, the stainless float opens the valve and ejects condensate without losing line pressure. There are no moving parts in the separating section at all, which is why these units outlast the compressors they are fitted to.
Key specifications
- Body: cast iron, ASTM A-278
- Working pressure and temperature: 250 PSI at 450 F
- Efficiency: removes 99 percent of liquid and solid entrainment 10 micron and larger
- Trap internals: non-magnetic 18-8 stainless valve and seat, hollow stainless float
- Standard orifice: 1/8 in. with Viton soft seat
- Drain connection: 3/4 in. NPT. Vent connection: 1/4 in. NPT
- Rated pressure drop at 100 psig: 1.19 psi
- 1.5STBN: 1-1/2 in. FNPT, 345 SCFM maximum at 100 psig
- 2.5STBN: 2-1/2 in. FNPT, 945 SCFM maximum at 100 psig
Cast iron, and what that buys you
Weight and temperature headroom. A 450 F rating puts the Type ST straight on a compressor discharge where aluminum and zinc separators have no business being, and it handles saturated steam service as readily as compressed air. The trade is obvious the first time you lift one onto a pipe stand. Budget for proper support: this is not a unit you hang off threaded pipe and hope.
Code status
No ASME code stamp and no CRN is available on the cast-iron ST. If your jurisdiction or your insurer requires a stamped vessel at this point in the system, this is not the separator for that location, and it is better to know now than at inspection.
Lineage
The line has been sold as Wright-Austin, then under Eaton Filtration as the Type T and ST, and most recently through Hamlet and Garneau. Catalog numbers never changed. A 1.5STBN ordered today is the same casting as a 1.5STBN ordered thirty years ago, which is useful when you are matching an existing installation rather than designing a new one.
Pricing note
Both sizes are current closeout stock. The 1-1/2 in. in particular is listed elsewhere at more than two and a half times what it sells for here.
NOTE: Actual product may be different from pictured!
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