2 replies to this topic

[ANILPIPING]

dear reader , please give me answer for following question.. 1 what is the function of balancing leak off line in boiler feed pump?

[samayaraj]

Hi Anil,

 

Balance leak off line is used to balance the centrifugal pump shaft from axial thrust. During pump operation, especially in multistage centrifugal, suction will have less pressure compared to discharge. Due to this, impeller along with the shaft will have a push from discharge end to suction end which is called as "axial thrust". Due to the axial thrust, pump bearings and internals will be affected. To nullify the axial thrust, a tapping from discharge end is connected to a balancing drum. The water coming out from balancing drum is routed in a line called as balance leak off line. Generally it is routed back to deaerator.

 

Hope this is clear!

 

 

#Samayaraj

Edited by samayaraj, 26 August 2014 - 06:23 AM.

[oscarsender]

Generally for vacuum services a balance line from pump to suction vessel is provided.