Filter By
Connection Size

Connection Type

Special Options
Close X

Check Valve (suffix code "-CV") - Built-in Inlet Check Valve is recommended when used on Superheated Steam

Operating Condition
Condensate Load  

SIB / SIBH Inverted Bucket Steam Trap

DRIP, TRACER: The SIBH inverted bucket trap is primarily used in drip and tracer applications. It has a larger capacity than the SIB series. Inverted bucket traps can handle superheated steam when a check valve is used. These traps are also used on unit heaters, laundry equipment, and other small process equipment where slow start-up due to poor air handling capability can be tolerated.

ModelSizeTypeMax PMO (psig)Max Capacity @ Max PMO (lb/hr)
SIBH-12-SW-151/2"Socket Weld151060
SIBH-13-SW-153/4"Socket Weld151060
SIBH-12-SW-301/2"Socket Weld301000
SIBH-13-SW-303/4"Socket Weld301000
SIBH-12-SW-701/2"Socket Weld70950
SIBH-13-SW-703/4"Socket Weld70950
SIBH-12-SW-1251/2"Socket Weld125950
SIBH-13-SW-1253/4"Socket Weld125950
SIBH-12-SW-2001/2"Socket Weld200860
SIBH-13-SW-2003/4"Socket Weld200860
SIBH-12-SW-2501/2"Socket Weld250760
SIBH-13-SW-2503/4"Socket Weld250760
SIBH-12-SW-4501/2"Socket Weld450263
SIBH-13-SW-4503/4"Socket Weld450263
Product Overview
DRIP, TRACING: The SIB & SIBH Inverted Bucket Steam traps are suitable for removing condensate from steam mains and steam supply lines. They are also used on unit heaters, laundry equipment, and other smaller, low capacity and less critical process applications where slow start-up can be tolerated. The discharge orifice of the inverted bucket trap is mounted at the top of the trap body, which makes them less susceptible to failure from dirt and debris when compared to other trap types. The SIBH is physically larger and has a higher press ure capability for a particular orifice size than the SIB.
• All stainless steel body
• Acceptable for superheated steam (with check valve installed at inlet)
• Waterhammer resistant
• Valve & seat are located at the top of the trap body making them less prone to clogging from debris and pipe scale
• All stainless steel internals with hardened valve & seat
How It Works
When the trap is filled with condensate, the inverted bucket inside the steam trap loses its buoyancy and rests on the bottom of the trap. This pulls the disc off the seat allowing condensate to be discharged through the seat orifice located at the top of the trap. When steam enters, it fills the inverted bucket causing the bucket to float to the surface which closes the discharge valve, containing the steam in the system. Eventually, the steam is bled off through a small hole in the top of the bucket causing it to sink, which repeats the cycle.
Selection / Sizing / Capacities

The PMO (maximum operating pressure) rating of model selected must meet or exceed the maximum steam pressure or the trap may not open. For example; the SIB-12-N-150 has a PMO of 150 PSI. Condensate capacity (lbs/hr) of the trap is based on the differential pressure across the trap.

Dimension and Weights
5.5 lbs.
Installation and Maintenance
Trap must be installed in upright position to function properly. The stainless steel body is seal welded and therefore non-repairable. If a new trap is required, remove and replace. Bucket traps require an internal water seal to operate. Applications with superheated steam can cause the water seal to flash into steam and trap to fail in open position. A check valve installed at trap inlet will help prevent the loss of prime.