Why do we use condensate pot in drum level measurement? Should it be used vertically or horizontally? Why not only impulse pipes used for accurate measurements??

 

Because "+" of "H" impulse pipe is inserted in the steam part of a drum. Therefore, it is necessary to have condensate pot in order to condensate steam into water so differential pressure transmitter can measure level as difference between two water tubes. "L" impulse pise is inserted directly into water part of a drum.

 

A condensate pot (horizontal) gives you a known level. Without some form of heat radiator the condensate level in the tubing can vary +/- by a few inches with changes in pressure. You often see a 3.000# fitting used instead of a condensate pot to serve the same purpose.

Roy