Factory Direct Pipeline Products, Inc.
145 State Highway 94
Blairstown, New Jersey  07825 U.S.A.
office (908) 362-9981  fax (908) 362-5631

Wright-Austin ST and 31L-ST Gas Liquid Separators
Cast Iron separators with integral drain trap for up to 40% by weight of the units flow capacity

This version of Wright-Austin cast iron air/liquid separators has an integral drain trap, making it easier to install and very compact. This design also reduces installation costs and eliminates the need to size and source a properly designed trap to work with in conjunction with the separator. The integral trap automatically ejects the condensate at predetermined levels without loss of line pressure.

ST gas/liquid separators usually ship within 7-10 days after receipt of an order.  If the lead time is critical, please contact our office and obtain a lead-time estimate based upon the current manufacturing backlog. 

gas liquid separator with trap SIZE CONNECTION PART NUMBER PRICE EACH
¾" FNPT 0.75STBN $336.70
1" 1.STBN $374.01
1¼" 1.25STBN $567.84
1½" 1.5STBN $649.74
2" 2.STBN $728.91
125# FF ANSI FLANGED 2.STFN $797.16
2½" FNPT 2.5STBN $1,065.61
3" 3.STBN $1,037.40
125# FF ANSI FLANGED 3.STFN $1,291.29
4" 4.STN $2,004.73
5" 5.STN $2,277.73

Low Profile Design
The Type 31L-ST is a horizontal, in-line separator is very compact and can be supported by the line in which they are installed, an important consideration in space restricted applications. These units would require a "special order". Expect a lead time of around 12-14 weeks.

Type 31 LST gas liquid separator
250 PSI @ 450°F
1¼" 1.2531LSTN
1½" 1.531LSTN
2" 2.31LSTN
2½" 2.531LSTN
3" 3.31LSTN
125 PSI @ 450°F
4" 4.31LSTFN

Performance Overview

  • ST separators are designed to remove entrained liquid and solids from air, gas or steam.  Their integral drain trap allows fluid to drain from the system without a system pressure drop.  This specific design is effective for applications where the entrained liquid flow rate is up to 40% by weight of the units flow capacity.

  • When properly sized, this separator will remove up to 99% of all liquid and solids greater than 10 microns in size from an air, gas or steam flow.  The removal is accomplished by a design that causes the air/gas/steam to enter a controlled centrifugal flow.  This results in forcing the entrained material to the outer wall and the VCP prevents re-entrainment.

  • Cast iron ST separators are constructed to ASME code for unfired vessels, Section VIII, Division 1 but NOT stamped. Code stamp and CRN not applicable to this product.

  • If you need assistance with proper selection, please fill-out our inquiry form.

  • Repair kits are only available for the float drain trap assembly. P/N 90-0-8C for $228.06.

  • Torque spec for body and drain trap bolts are 255 in-lbs.

  • ST Separator Options:

    • Add $77.00 for a 1/2" thermometer connection.

    • Add $280.00 for a 50 wt, 120 volt, self-limiting heating element for applications below freezing. The heater does not increase line temperature and can be easily removed for inspection. Add an "H" to the part number after the "ST"; adds 3.5 lbs. to the weight.