Previous in Forum: Two Fire Pump In Series   Next in Forum: API 5L Line Pipe
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
4 comments
Rate Comments: Nested
Anonymous Poster

Power Required To Drive

11/27/2007 4:50 AM

what should be the power of the motor required to drive a pump of capacity 7000m3/hr and the pressure difference is 5kg/cm2? The efficiency of the pump is 90%.
Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: power required to drive

11/27/2007 5:09 AM

Convert the pressure to N/m2. Multiply by the flowrate. Divide by the efficiency. Divide by 3600sec/hr. Answer is in Watts. Done.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Reply
Codemaster
Guru

Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
Good Answers: 137
#3
In reply to #1

Re: power required to drive

11/27/2007 6:36 AM

Hello PW - only thing I'd add to that is I'm sceptical about the 90 % pump efficiency. It's a big pump (~1200 kW) but even so 90 % is optimistic. Axial flow (propellor-type) pumps have good efficiency but I suspect 5 kg/cm2 is above their pressure range.

Cheers.....Codey

__________________
 Give masochists a fair crack of the whip
Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#2

Re: power required to drive

11/27/2007 5:23 AM

.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Reply
TexasCharley
Guru

Join Date: Jul 2007
Location: 30°30'N, 97°45'W, Elv: 597 ft.
Posts: 2410
Good Answers: 10
#4

Re: Power Required To Drive

11/28/2007 8:28 PM

Hey, there is only a period. Ooooh....I get it.

__________________
 I never apologize. I'm sorry that's just the way I am.
Reply
Reply to Forum Thread
Have a Different Question?
4 comments
Copy to Clipboard

Users who posted comments:

Codemaster (1); PWSlack (2); TexasCharley (1)

Previous in Forum: Two Fire Pump In Series   Next in Forum: API 5L Line Pipe

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Mechanical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (90 right now)
Show Members
Advertisement