Why some SPECS ask pump operation to the left of the BEP?
Why some SPECS ask pump operation to the left of the BEP?
(OP)
PER API 610, 70%-120%of BEP for prefered operation range. But in our company's spec, it is preferred pump operation to the left of the BEP which means 70%-100%.
Any body can explain a little bit? Thanks.
Any body can explain a little bit? Thanks.
MSc. Mechanical Engineering;
5 years EPC experience;
Oil & Gas industry in Canada.





RE: Why some SPECS ask pump operation to the left of the BEP?
Hydraulic and vibration, seals, bearings problems decrease in this range.
That is because design of pump ocurrs at BEP.
I hope this helps.
RE: Why some SPECS ask pump operation to the left of the BEP?
Why don't you ask the spec. writer WHY? That should solve your problem.
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: Why some SPECS ask pump operation to the left of the BEP?
Independent events are seldomly independent.
RE: Why some SPECS ask pump operation to the left of the BEP?
RE: Why some SPECS ask pump operation to the left of the BEP?
Independent events are seldomly independent.
RE: Why some SPECS ask pump operation to the left of the BEP?
Any more info on the type of API pump we are talking about ?
ps: For Waste water submersible pumps (so not API), it is very common that the pump is selected to operate at left of the curve (50- 60% of BEP).
RE: Why some SPECS ask pump operation to the left of the BEP?
Be careful with the terms "operate" and "design." If you tell a pump vendor to design for left of BEP, you might not have the NPSH or motor HP covered for flows higher than BEP. Which defeats the purpose, if the intent of the spec was to have flexibility for future flow increase with the equipment.
Operation left of BEP is what you say the spec says, that's fine, pick a slightly larger pump. But "Preferred operating region" (OP said range, I assume it was meant to be region) is a term that has a definition in API. Paraphrasing, it is the flow range that the pump must pass base limits of vibration at test (there are higher limits for "allowable operating region.")
The range of BEP that is used when selecting a pump is 80-110%. This is specified in API, but does not have a firm definition. It sounds like the spec limits this to 80-100%. That is what it means.
Even if everyone understands the intent, one word can change a lot in a specification.
RE: Why some SPECS ask pump operation to the left of the BEP?
regards,
arthur stack
softedge=innovation