IM-P122-02 CMGT Issue 11
9
BPT13 Balanced Pressure Thermostatic Steam Traps
After installation or maintenance ensure that the system is fully functional. Carry out tests on any alarms
or protective devices.
The operating element is a capsule containing a small quantity of a special liquid with a boiling point below
that of water. In the cold conditions that exist at start-up, the capsule is relaxed. The valve is o its seat and
is wide open, allowing unrestricted removal of air. This is a feature of all balanced pressure traps and explains
why they are well suited to air venting.
As condensate passes through the balanced pressure steam trap, heat is transferred to the liquid in the
capsule. The ll liquid boils before steam reaches the trap. The vapour pressure within the capsule causes
it to expand and the trap shuts. Heat loss from the trap then cools the water surrounding the capsule, the ll
condenses and the capsule contracts, opening the valve and releasing condensate until steam temperature
approaches again at which the cycle is repeated.
4. Commissioning
5. Operation
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