What kind of tests for bare pump?
What kind of tests for bare pump?
(OP)
Hi All,
I have a pump which designed to ISO 5199.
To avoid prolong downtime and long lead time, I would like to purchase ONLY a bare pump to keep as spare.
Just to check, do I need to ask vendor to include: hydrostatic test, performance test and NPSH test?
I have a pump which designed to ISO 5199.
To avoid prolong downtime and long lead time, I would like to purchase ONLY a bare pump to keep as spare.
Just to check, do I need to ask vendor to include: hydrostatic test, performance test and NPSH test?





RE: What kind of tests for bare pump?
RE: What kind of tests for bare pump?
Yes, you are right. A bare pump means a pump without motor.
Actually we can use shop motor if it is available from vendor to perform all the tests.
My concern is the necessity to perform the performance test and NPSH test since its operating condition would remains the same as existing pump.
Hydrostatic test maybe should be included to make sure there is no leakage.
RE: What kind of tests for bare pump?
I would also think you would need a spare set of bearings if this pump is going to sit on the shelf. On large pumps waiting in storage for installation we have the contractor rotate the shaft on a periodic basis
RE: What kind of tests for bare pump?
RE: What kind of tests for bare pump?
Hydro test, performance test to a nominated duty, vibration test and prepared for storage would be the norm.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: What kind of tests for bare pump?
Personally, I see no need for that, assuming you're buying from a reputable vendor.
RE: What kind of tests for bare pump?
Upshot is I would always want to see performance testing performed on any pump I specified.
RE: What kind of tests for bare pump?
http://www.eng-tips.com/viewthread.cfm?qid=417235
http://www.eng-tips.com/viewthread.cfm?qid=418631
RE: What kind of tests for bare pump?
Hydrostatic tests are always performed by the manufacturer whether you want it or not.
Most manufacturers run a performance test anyway, they just charge you to provide the results of the test. The charge is always nominal and should be paid for.
An NPSH test can be useful if there is a close margin; your call.
For critical service pumps you may want to evaluate necessity of:
- mag particle or similar test for casting quality, or even request mill certificates.
- record vibration data (added onto performance test)
- performance test using job mechanical seals.
Ask the manufacturer what all they offer, they'll be happy to tell you.
As Artisi says, you can have whatever you want, if you're willing to pay for it.