3 replies to this topic

[babulala]

For a pump in existing system how to measure the developed head across it.
Is it the diffrence beteween suction & discharge PG readings. please clarify.

[Padmakar Katre]

Dear,
You are right the differential pressure in a centrifugal pump is nothing but the Discharge Pressure minus Suction Pressure. Now you can convert this to head by using the density of the fluid.

[man2k]

Pumps developed head has both pressure & velocity components.(sqr(velocity)/2g)+diff head across the pump.mr.padmakar is correct but in as i feel only in shutoff condition the difference in PG of suction & discharge can give fully developed head of the pump as there is no flow (Velocity=0).

[djack77494]

only in shutoff condition the difference in PG of suction & discharge can give fully developed head of the pump as there is no flow (Velocity=0).

The true pump developed head would also be obtained if the suction & discharge pipes were the same size and pressure gauges were mounted in each. More often than not, however, this is not the case, and a correction for the difference in velocity heads should be incorporated into the calculation.