Circulation pump
Circulation pump
(OP)
Hi everyone,
We have a problem with our circulation pump of the firewater tank. the rated power on the plate shows 11 kw,
while our reading given 4.7 kw (8.5 R-Y-B, V-L-L -396v) & (Pump 35 l/s & 15.4 m and suction lift of 1.6m, dH-0 m)
we have enhanced the suction discharge lines as 8 nos of foot valves (PN16)in the suction of 150mm and 12 nos MFP nozzles of 50mm connected in 100mm discharge line in order to cover the entire tank water for circulation.
Besides the flow reading was less as 21 l/s in fully opened line and the discharge pressure in the downstream was 6-7 psi.
NPSH available has been proven above the required to aforementioned design. ( NPSHa =3.9 m, NPSHr =2.1m )
Is the pump performing under and cause cavitation? could anyone diagnose the problem and advise me what is lacking
Please
We have a problem with our circulation pump of the firewater tank. the rated power on the plate shows 11 kw,
while our reading given 4.7 kw (8.5 R-Y-B, V-L-L -396v) & (Pump 35 l/s & 15.4 m and suction lift of 1.6m, dH-0 m)
we have enhanced the suction discharge lines as 8 nos of foot valves (PN16)in the suction of 150mm and 12 nos MFP nozzles of 50mm connected in 100mm discharge line in order to cover the entire tank water for circulation.
Besides the flow reading was less as 21 l/s in fully opened line and the discharge pressure in the downstream was 6-7 psi.
NPSH available has been proven above the required to aforementioned design. ( NPSHa =3.9 m, NPSHr =2.1m )
Is the pump performing under and cause cavitation? could anyone diagnose the problem and advise me what is lacking
Please





RE: Circulation pump
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: Circulation pump
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Circulation pump
rated power from motor plate. yes we realized that the available head even we get positive answer by calculation theoretically, it must have affected the capacity.
Is the PN (PN16) rating of the foot valve playing any role, I mean, the spring is too stiff to be lifted fully?
RE: Circulation pump
RE: Circulation pump
Magnetic or any mechanical type such as turbine
RE: Circulation pump
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: Circulation pump
RE: Circulation pump
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Circulation pump
please find attached zip file format. sorry for the inconvenience.