Dearator Position

Dear Guest,To prevent or reduce the chance of Cavitation.... The boiling of a liquid caused by a decrease in pressure rather than an increase in temperature...... Vapors don't work well with pumps.

This may be to allow the bubbles to coalesce, or join together in the pipe to the dearator. This way the dearator releases only air, and not froth, which would be messy.

Loved the replies, but it is actually to maintain a constant suction pressure to the feed pump that it is supplying.

Dear Al, Please help me to understand your first posting..... What is(does it mean), a Constant Suction Pressure?

It means that the pressure at the inlet of the feed pump is constant. Provided the Dearator pressure control is good. Having a constant inlet pressure stops the pump from surging. The outlet preesure is constant depending on the drum level feed valve position of course. Plus you will also have a constant inlet temperature.

Make sure you have a low DA cut off. If the DA runs out of water and you have a feed pump with a stainless impellor, it will seize up very quickly.

Sorry for the delay in replying.