Pump Testing for NPSHR 1

[DAFChkPmps]

Hello all,

I just found this site and found some interesting threads. One spoke a little about NPSH testing and I have some products that I need to get NPSHR data on and my question is do any of you know a test house that does this type of testing?

Thanks in advance

Doug
CheckPoint Pumps

 

[Ashereng]

Doug,

For NPSHR, we usually go by what the pump manufacturer says.

For NPSHA, in the past, we have relied on our own data. We put a pressure transmitter in the suction to the pump.

"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

 

[DAFChkPmps]

Ashereng, We are a Pump MFG and are just getting big enough to need the testing. Thanks for the tip on the transmitter on the suction side. But if you hear of a test house from any other pump mfg please pass it along.

Thanks again.

 

[Ashereng]

Ooops. Sorry. Missed that. You need to figure out the NPSHR because you ARE the manufacturer.

Have you tried calling another pump manufacturer and see who they use?

Also, some of them may have a lab where they will take contracts to determine NPSHR for other manufacturers. Would this work for your company?


"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

 

[rmw]

I worked for a company that had its own test lab for our final product which was evaporators, but since NPSHR was so critical for our product, we tested the pumps too.

We found with most manufacturers that they overstated (or is it understated) their NPSH values. We only found a few pumps where we could trust the vendor curves implicitly.

But, we tested all mfgr's pumps, regardless. We had to be right.

rmw

 

[Ashereng]

rmw, maybe you can forward the company/vendor that made the test rig to Doug?

"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

 

[rmw]

We made the test rig. Since we had to test a variety of models and sizes of our product, our test lab had a cacophony of pipes, tanks, fittings etc. Plus, we were a manufacturing company, so if we needed anything special, the shop could build it for us.

We had done this for a variety of pumps and had decided on some specific brands (we handled sea water so our range was narrowed by those who could produce pumps in all bronze or similar metallurgy's and we did Navy work, so only those who could work to Mil Specs were generally used.) So after we found the keepers, we only did further testing when new vendors were being analyzed.

rmw