SCREW PUMPS OR CENTRIFUGAL PUMPS
SCREW PUMPS OR CENTRIFUGAL PUMPS
(OP)
Does anyone know when screw pumps are used. In the project we had lots of hydrocarbon like Naphtha, gas oil, gasoline....
For Fuel oil with the viscosity of 950 CP and flow rate of 1250m3/hr, I used twin screw pumps which now the client ask us to use the centrifugal ones or explain whay centrifugal pumps can not be used.
For the mentioned condition of fuels centrifugal pumps can be used?
For Fuel oil with the viscosity of 950 CP and flow rate of 1250m3/hr, I used twin screw pumps which now the client ask us to use the centrifugal ones or explain whay centrifugal pumps can not be used.
For the mentioned condition of fuels centrifugal pumps can be used?





RE: SCREW PUMPS OR CENTRIFUGAL PUMPS
Especially if the flowing conditions changes as your high visvosity fluid also often see a strong temperature dependency of the viscosity.
Best regards
Morten
RE: SCREW PUMPS OR CENTRIFUGAL PUMPS
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"Pumping accounts for 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: SCREW PUMPS OR CENTRIFUGAL PUMPS
Also the design case will be maximum viscosity(950 CP). The pumps will be used in Tank farms to transport the products into the ships.
Our client want to have the chipest pumps for this applications. Screw manufacturers submitted suitable offer with force loblication (external lobrication system).
Can we use the centriugal pumps for this application?
RE: SCREW PUMPS OR CENTRIFUGAL PUMPS
**********************
"Pumping accounts for 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: SCREW PUMPS OR CENTRIFUGAL PUMPS
It realy will be appicable?
RE: SCREW PUMPS OR CENTRIFUGAL PUMPS
See htt
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"Pumping accounts for 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: SCREW PUMPS OR CENTRIFUGAL PUMPS
RE: SCREW PUMPS OR CENTRIFUGAL PUMPS
Thanks so much for your kindd hepls,
I have problem with the pump selection, let me explain to you,
Actually for pump type selection I used Exxon Mobil Corporation guids. They mentioned for viscosity over 600 CP centrifugal pumps are not suitable, then I used screw pumps (according to API 676) for this condition (940 CP, 1375m3/hr, Discharge pressure=16.5barg). I also searched throughother references (shell...) and I found that screw is the best chose. Also, I calcuated voscositycorrection factor for this condition and it is near 0.6, Ifound that the total required power will increased for centrifgal 1.2times rather than screw pumps.
I searchmuch reference projects and I found that in many similar projects, the screw was used (for the same condition..)
Finally the client asked for centrifuga pumps! I would like toknow which option (my select or client request)isthe best one withconsidering commercial and technical matters.
Thanks
RE: SCREW PUMPS OR CENTRIFUGAL PUMPS
In your case the optimal selection may depend on how much time you spend pumping gasoline versus how much time you spend pumping heavy crude.
My e-mail; Google "virtualpipeline" and its #1.
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"Pumping accounts for 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: SCREW PUMPS OR CENTRIFUGAL PUMPS
The required power will increase because of the efficiency correction factor of 0.6!
Is it usual to use centrifugal pumps for such viscose fluid and mentioned condition? On the other hand, many operational problems will be raised during the operation or not?
RE: SCREW PUMPS OR CENTRIFUGAL PUMPS
**********************
"Pumping accounts for 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: SCREW PUMPS OR CENTRIFUGAL PUMPS
<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying " Damn that was fun!" - Unknown>>
RE: SCREW PUMPS OR CENTRIFUGAL PUMPS
RE: SCREW PUMPS OR CENTRIFUGAL PUMPS
I've also used two pumps, in series for start, switching to parallel when things get moving.
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"Pumping accounts for 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/