high pressure pump and booster pump (drop in pressure)
high pressure pump and booster pump (drop in pressure)
(OP)
Hi
I am new , We are running an R.O plant in an isolated island where it is very difficult to inspect during the summer because of severe weather conditions. The only connection between our office and the island is through phone.
The problem is as follow:-
ยท The high pressure(multi stage) pump is not delivering the desired head, instead of 54 bar it delivers only 47 bar. This shortage in pressure is effecting the result of water from the R.O plant which is the only water resource in the island.
The team there opened the multi stage H.P. pump and they found minor damage in some of the seals, they replaced them, but the problem continued with the same pressure drop.
Before the high pressure pump there is a booster pump with a pressure of 2.5 bar. But during this month the discharge pressure gage of the booster pump is not working though it appears that the booster pump is delivering the desired pressure.
My question :-
Can a small drop in the booster pump pressure effect the discharge pressure of the multi-stage high pressure pump (for example:- from 2.5 bar to 2 bar) .
Thanking you all
I am new , We are running an R.O plant in an isolated island where it is very difficult to inspect during the summer because of severe weather conditions. The only connection between our office and the island is through phone.
The problem is as follow:-
ยท The high pressure(multi stage) pump is not delivering the desired head, instead of 54 bar it delivers only 47 bar. This shortage in pressure is effecting the result of water from the R.O plant which is the only water resource in the island.
The team there opened the multi stage H.P. pump and they found minor damage in some of the seals, they replaced them, but the problem continued with the same pressure drop.
Before the high pressure pump there is a booster pump with a pressure of 2.5 bar. But during this month the discharge pressure gage of the booster pump is not working though it appears that the booster pump is delivering the desired pressure.
My question :-
Can a small drop in the booster pump pressure effect the discharge pressure of the multi-stage high pressure pump (for example:- from 2.5 bar to 2 bar) .
Thanking you all





RE: high pressure pump and booster pump (drop in pressure)
Get that pressure gauge replaced. Do a single gauge pressure survey through the system and compare them to what the pumps should be doing at design and the pressures the pumps need at design (eg suction pressure).
RE: high pressure pump and booster pump (drop in pressure)
This will clarify your comment.
International College
Naresuan University
Phitsanulok
Thailand
RE: high pressure pump and booster pump (drop in pressure)
RE: high pressure pump and booster pump (drop in pressure)
TD2K (Chemical)
Artisi (Mechanical)
quadtracker (Petroleum)
thank u all for ur kinde advice and time.
RE: high pressure pump and booster pump (drop in pressure)
BTW: For you question: Head is summed for pumps in series. So a drop in discharge from your booster would result in a 0.5 drop in total - unless as TD2K says you get cavitation.
High speed (multi stage pumps) may have very high NPSHr. I resently oversaw deliverence of a water injection pump (for an oil filed). This pump has a NPSH of 8 bar (80 meter or approx 250 ft of head). So the initial "booster" pump had a discharge head of 16 barg!