STEAM TRAP APPLICATIONS PROCESS TRAP GUIDELINES – Syphon Drainage
ROTATING STEAM DRYER Commonly found in the Paper Making industry, a rotating piece of equipment offers a unique challenge of removing the condensate. Steam inside a rotating drum cylinder is used to heat product such as sheets of paper over the outside surface of the drum. The steam pressure pushes the condensate up through the pipe to the steam trap. Since the pipe that the condensate is traveling through is surrounded by steam, an issue can develop that will “ Steam Lock ” the trap causing the trap to stay closed, allowing the condensate to build up inside the rotating drum (Figure 4). By placing a Steam Lock Release feature on the Steam Trap, a small amount of steam will be constantly discharged through the trap. This allows condensate to reach the steam trap which causes it to open and function properly. This steam lock release feature is available on ALL F&T and Thermostatic traps and should be considered on this type of application.
Steam Lock Release Option must be used when trap is positioned above condensate level. Rotating Steam Dryer Illustrating “Steam Lock”
Figure 4:
Rotary Coupling (allows drum to freely rotate)
Rotating Drum
Condensate level drops, steam enters and closes steam trap
Condensate rises and steam is trapped, preventing discharge of condensate
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