The silencing was achieved by the fitting of an APT14 automatic pump-trap. It eliminated condensate build up in the steam heating coils of a hot water calorifier in the basement of the company’s offices. This excess condensate caused the calorifier to continuously bang and crackle when the offices were up to temperature.
The pump-trap is a combined steam trap and mechanical pump that is capable of draining condensate from heat exchangers and process plant under all load conditions, even vacuum.
Being half the size of a traditional pump-trap solution, the APT14 can be installed in areas with as little as 0.2m installation head. This was an important feature for this application as it avoided the cost of having to elevate the calorifier, or excavate a pit in the concrete floor to install a conventional pump. Neither of these solutions were economically viable.
As the unit is self-contained, it requires no electricity, and uses plant steam as motive power to pump out condensate.
In operation, condensate enters the unit’s chamber through the inlet. Under normal conditions the condensate freely flows through the chamber into the condensate return system. In some circumstances, however, high back pressure from the condensate return system can prevent condensate leaving the heat exchanger.
When this happens, the condensate outlet closes. Condensate continues to flow into and fill the chamber. A mechanical float rises with the condensate level until a snap action mechanism opens a steam inlet. Steam pressure then forces out the condensate; the float falls until it re-engages the pump mechanism, which closes the steam inlet, until the next time when the cycle is repeated.
Spirax-Sarco Tel: 01242 521361