booster pump design
booster pump design
(OP)
I have a pump application where the npsha is less than the npshr. process specs given below:
npsha = 7.5 ft
npshr = 18 ft
sg = 0.6
vis = 0.36 cp
liquid at bubble point
suction p = 350 psig
discharge p = 4200 psig
I realize that there are other ways to increase the npsha other than installing a booster pump (i.e. raise vessel height, etc.) but at this point I am only interested in how I would even begin to spec out or design a booster pump to get the npsha on the main pump up to the required npshr. Can anyone provide me with the equations, as well as the theoretical and practical knowledge on how to do this?
Thanks.
npsha = 7.5 ft
npshr = 18 ft
sg = 0.6
vis = 0.36 cp
liquid at bubble point
suction p = 350 psig
discharge p = 4200 psig
I realize that there are other ways to increase the npsha other than installing a booster pump (i.e. raise vessel height, etc.) but at this point I am only interested in how I would even begin to spec out or design a booster pump to get the npsha on the main pump up to the required npshr. Can anyone provide me with the equations, as well as the theoretical and practical knowledge on how to do this?
Thanks.





RE: booster pump design
I don't really understand the numbers you're giving. You say 350 psi at suction. What is that? It can't be the expected suction pressure, that would give you a 1346 foot head.. well above 18ft. What is that?
http://virtualpipeline.spaces.msn.com
RE: booster pump design
The simplest way to find a suitable booster pump is probably to contact the major pump manufacturers that you are most comfortable working with. You have the flow rate and the suction pressure. All you need to do is estimate how much discharge pressure you want from the booster and that is all the conditions that the pump company will need to recommend a pump. If you want to be certain to avoid cavitation on the larger pump, I would suggest sizing the booster to provide 3 or 4 times the NPSH(r) for the larger pump. So, for the sake of argument, I would select a pump with perhaps 50 or 70 feet of head. Try to get a pump that will be running at 1800 rpm rather than 3600. Try to get a pump sized to run very close to BEP flow.
Johnny Pellin
RE: booster pump design
http://virtualpipeline.spaces.msn.com
RE: booster pump design
Doug
RE: booster pump design
http://virtualpipeline.spaces.msn.com