Re: Safety Standards
Originally posted by louispanjang
Hello All,
When designing long distance piping setups there is always plenty of emphasis on the adequacy of the piping elements and Standards are available, applied and relied upon.
Pumps are a different matter. Mineral slurry pumps do not appear to be governed by a dedicated Standard like API or PIP where a certificate would be mandatory. In contract discussions with pump manufacturers I have been consistently advised that the testing specified in the enquiry documents was not possible because the working fluid specified was not/could not be available for the test. True. The argument is then used to preclude any testing of the pumps with water on the grounds that the performance corrections might be irrelevant. Works testing has then to be foregone.
Beneath all this performance test negotiation the manufacturers' allowable casing pressure is compliant in the oblivion. The standpoint is that the manufacturers' casing rating must be accepted in the absence of performance test results. Vessels and pipes carry copious certification and test requirements but pumps seem to get away with it, despite the astronomical prices of some 'quality' pumps.
I was recently advised by the Engineering Manager of a/the leading slurry pump manufacturer that they have no NDT system for their castings. Blow holes might or might not be lurking behind the gaskets. How then can pipeline designers verify the casing pressure limitations offered by the salespeople?
Is there a relevant Standard somewhere?
Greetings and salutations Louis,
I always thought they were always rated for one atmosphere of pressure as they were designed as self priming centrifugals?
One phone call or letter to folks at Gould pumps in Seneca Falls, New York just up the road from me would be in order here as they build a huge number of slurry pumps and I am sure they would be able to help you.
I think Wilfey slurry pumps is still a going concern-Denver Co. I think Flygt builds them too or they used to?
The other thought was the ASTM organisation and the pipe maufactures association here in the United States.
As they are a sand cast pump the metallurgy for the cast has to be perfect prior to pouring into a casting mold.
lzaharis ■
Safety Standards
Hello All,
When designing long distance piping setups there is always plenty of emphasis on the adequacy of the piping elements and Standards are available, applied and relied upon.
Pumps are a different matter. Mineral slurry pumps do not appear to be governed by a dedicated Standard like API or PIP where a certificate would be mandatory. In contract discussions with pump manufacturers I have been consistently advised that the testing specified in the enquiry documents was not possible because the working fluid specified was not/could not be available for the test. True. The argument is then used to preclude any testing of the pumps with water on the grounds that the performance corrections might be irrelevant. Works testing has then to be foregone.
Beneath all this performance test negotiation the manufacturers' allowable casing pressure is compliant in the oblivion. The standpoint is that the manufacturers' casing rating must be accepted in the absence of performance test results. Vessels and pipes carry copious certification and test requirements but pumps seem to get away with it, despite the astronomical prices of some 'quality' pumps.
I was recently advised by the Engineering Manager of a/the leading slurry pump manufacturer that they have no NDT system for their castings. Blow holes might or might not be lurking behind the gaskets. How then can pipeline designers verify the casing pressure limitations offered by the salespeople?
Is there a relevant Standard somewhere? ■