PARALELL PUMPS
PARALELL PUMPS
(OP)
HELLO, COULD YOU help me with this case:
flow = 500.000 l/h
Suction= on load
Discharge= 2000 mts length,10 mts high. diameter 10"
liquid= vegetal oil ( 500 ssu)
these rules are ok?
Qt= Q1+Q2+Q3+Q4
Ht= H1+H2+H3+H4
so..
I HAVE TO SET 4 VANE PUMPS IN PARALELL.
EACH OF THEM IS GOING TO DELIVER 125.000 L/H.
PUMPS DELIVER THE LIQUID TO A 10" COLECTOR THAT GO 2000 Mts STRAIGHT TO THE SHIP.
DISCHARGE HEAD VALUE IS 11.5 BAR. ( aprox)
EACH PUMP HAVE TO DELIVER 125000 L/H,AT 11.5 BAR PRESSURE AT WORKING CONDITIONS.
is it true.??
Then I have to know how is the power that each pump needs to pump the liquid to the ship.
flow= 125000 l/H
discharge head= 11.5 bar
flow = 500.000 l/h
Suction= on load
Discharge= 2000 mts length,10 mts high. diameter 10"
liquid= vegetal oil ( 500 ssu)
these rules are ok?
Qt= Q1+Q2+Q3+Q4
Ht= H1+H2+H3+H4
so..
I HAVE TO SET 4 VANE PUMPS IN PARALELL.
EACH OF THEM IS GOING TO DELIVER 125.000 L/H.
PUMPS DELIVER THE LIQUID TO A 10" COLECTOR THAT GO 2000 Mts STRAIGHT TO THE SHIP.
DISCHARGE HEAD VALUE IS 11.5 BAR. ( aprox)
EACH PUMP HAVE TO DELIVER 125000 L/H,AT 11.5 BAR PRESSURE AT WORKING CONDITIONS.
is it true.??
Then I have to know how is the power that each pump needs to pump the liquid to the ship.
flow= 125000 l/H
discharge head= 11.5 bar





RE: PARALELL PUMPS
Please review
http://www.mcnallyinstitute.com/18-html/18-1.htm
RE: PARALELL PUMPS
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"Pumping systems account for nearly 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic
"Note: Make that 99.99% for pipeline companies" - http://virtualpipeline.spaces.live.com/
RE: PARALELL PUMPS
THE HEAD IS:
ht=h1=h2=H3
tHIS IS CORRECT??
RE: PARALELL PUMPS
parallel heads do not add together. Head will be somewhere inside a range from the suction head + lowest pump differential head to the suction head + highest pump differential head.
**********************
"Pumping systems account for nearly 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic
"Note: Make that 99.99% for pipeline companies" - http://virtualpipeline.spaces.live.com/
RE: PARALELL PUMPS
so how can I get the woking pressure for each pump.??
First I calculate the total head value ( of the piping system) and then with this value I go to the curve and I get the power required for each pump.( with its flow, the same each pump)
I thougt that the prssure value was The total head value of the piping system for each pump.
Do you understand me??
RE: PARALELL PUMPS
Please review (worth repeating):
RE: PARALELL PUMPS
**********************
"Pumping systems account for nearly 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic
"Note: Make that 99.99% for pipeline companies" - http://virtualpipeline.spaces.live.com/
RE: PARALELL PUMPS
For instance, if the total discharge head is - let's say 10 metres for the discussion, then each pump sees the same discharge head (10 metres) while pumping at the specified rate with the 4 pumps in operation.
RE: PARALELL PUMPS
"Pumping systems account for nearly 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic"
Of the 20% of the energy used, what percentage of that do you think is wasted energy due to poorly selected pumps, pipelines, configurations etc resulting in operating away from BEP, by-passing excess flow back to source, throttlled flow etc?
RE: PARALELL PUMPS
Artisi,
I need to stop thinking about all of the poorly sized systems I have observed in the US and abroad. With that said, I will guess a minimum of 25% is "wasted energy"
:(
RE: PARALELL PUMPS
33.33 -50 % ?
**********************
"Pumping systems account for nearly 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic
"Note: Make that 99.99% for pipeline companies" - http://virtualpipeline.spaces.live.com/
RE: PARALELL PUMPS
RE: PARALELL PUMPS
See thread407-231185: Low Volume Gear pump
**********************
"Pumping systems account for nearly 20% of the world's energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: PARALELL PUMPS
Do you really mean vane pumps? These are positive displacement pumps, but your discharge head is quite high for this type of pump. Can you provide details of the pumps?
RE: PARALELL PUMPS