How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
(OP)
Hi All,
I am wondering about how to fill out API mechanical data sheet supposed to cover 2 different operation condition? in the other hand, we have a 2+1 condensate transfer pumps with specified conditions . but this pump's capacity will be different after 5 years. how it can be?
I am wondering about how to fill out API mechanical data sheet supposed to cover 2 different operation condition? in the other hand, we have a 2+1 condensate transfer pumps with specified conditions . but this pump's capacity will be different after 5 years. how it can be?





RE: How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
Without some more information to the system, controls, etc it's hard to get much more specific.
I had a system where we were offloading tank cars through a common line, we had to design the system from one pump oto three running in parallel. With the line losses, I knew the discharge pressure was going to vary enough to worry me. We summarized the information and sent it out for proposals. While we got proposals back, when we looked at the proposals and curves we ended up having to install a backpressure control valve as none of the centrifugal pumps could handle the range of discharge pressures without running off the end of their curves. Just don't accept the vendors' proposals, you need to look at them in light of your system and its design.
RE: How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
Of course that is not to say a manufacturer can't give any additional assurance for the remainder of the performance curve; but it has always been the practice of manufacturer's to guarantee one point.
RE: How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
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: How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
Let the vendor work out how can they met these conditions...There are many options depending on the conditions
1) by impeller change--bigger or samller
2) By adding or removing impellers if it is multi-stage pumps-- casing and motor based on the most stringent requirement.
3) Using VFD..
It all depends on the changes required.
Before you issue the formal inquiry, you better talk to some vendors first to make sure it is workable.
RE: How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
"This pump is one and the same pump as is specified on (the other) data sheet, so it must perform satisfactorily at each service condition."
RE: How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
RE: How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
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: How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
You should also ensure the pump supplier shows the min and max impeller curves on the proposal curve, as for your year 5 case you may want to the impellars so you can operate nearer the BEP.
RE: How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
RE: How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
Yes you may have to trim the impellers, fit a larger impeller or adjust the flow control valves in the system in the future. Pipes may age but they may also be cleaned or replaced. Future process duties are notorious for being wrong. The "future" as you see it now may not be what it is when it occurs!
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---B.B. King
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RE: How Fill Mechanical Data Sheet for a Pump covering 2 different operation condition?!!!!!
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.)