Which trap backs up more condensate, a Velan Bimetallic steam trap or a thermodynamic steam trap?
Actual tests show that the thermodynamic steam trap will back up more condensate than a Velan bimetallic steam trap. The reason is because a thermodynamic steam trap discharges condensate based upon ambient conditions, not by the amount condensate in the drain leg. If it is warm outside, or the trap is insulated, it will not open and remove condensate until the steam trapped above the disc condenses. Tests in the Velan lab have shown that the thermodynamic design can collect up to 72 inches of condensate in a ¾” pipe before cycling. Conversely, if a thermodynamic steam trap is exposed to low ambient temperatures, or precipitation, it will cycle continuously, resulting in substantial loss of live steam. The Velan bimetallic steam trap will only hold a maximum of 12-18 inches of water in a ¾” pipe in front of the trap. This will actually promote better condensate removal because of the constant pressure drop across the trap. In superheated conditions, the trap will remain fully closed wh
