How much lift will a steam trap provide?
A. None. A trap does not provide lift. Lift is provided by the trap inlet pressure. Normally a 1 foot (305 mm) lift is practical for every 1 pound (.45 kg) of differential pressure. When there is a modulating regulator in the steam supply the trap discharge must drain by gravity or condensate will back up into the steam space, which may cause water hammer. When the trap discharge has a lift, a check valve must be installed to prevent backflow of condensate. Condensate lifts should be avoided if possible, since they can cause poor air venting and water hammer. ../images/blnkspace.gif Q.
None. A trap does not provide lift. Lift is provided by the trap inlet pressure. Normally a 1 foot (305 mm) lift is practical for every 1 pound (.45 kg) of differential pressure. When there is a modulating regulator in the steam supply the trap discharge must drain by gravity or condensate will back up into the steam space, which may cause water hammer. When the trap discharge has a lift, a check valve must be installed to prevent backflow of condensate. Condensate lifts should be avoided if possible, since they can cause poor air venting and water hammer.
