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.
The ST is easy to install and has a
small footprint compared to installing two separate
separator and float drain trap units. Removal of the bottom
flange releases the trap mechanism for inspection. All drain
trap components are made of rust-proof stainless steel and
include a nonmagnetic 18-8 stainless steel valve and seat.
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
Code stamp and CRN not applicable to
ST Separator Options:
• Add $68.25 for a ½" thermometer connection.
• Add $390.00 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.
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
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.
• Click on part number for the corresponding
• ST Parts List
Air Sizing Chart
Steam Sizing Chart
• Torque spec for body and drain trap
bolts are 255 in-lbs.
• ST Separator/Trap
• 31LST Low Profile