Re: Pump efficency

From: <geoff.stone@lendlease.com.au>
Date: Mon Jul 30 2001 - 18:47:00 EDT

One has to do a cost benefit analysis in any study to improve overall efficiency of a pump installation.

Some key issues may be :

1. Replace control valves by using variable speed drives. Thus the energy used does not include that burnt up across the valve. The old school used to use one third of the system losses across the control valve as a rule of thumb.
2. Use low efficiency motors. Use low noise motors also to reduce cost of noise mitigation.
3. Select the pump from a supplier who's design has a higher efficiency than the lowest price offering.
4. Look at the details of the piping. Improve radius on the suction nozzle and eliminate square edge entires, use longer transitions rather than step edged type etc
5. Use full bore valves rather than reduced port.
6. Consider three smaller ( 2 duty/1 standby) rather than two larger pumps.
7. get over the thought that 2 pole speed pumps are going to wear out faster than 4 pole speed pumps. @ pole speed pumps are smaller and more efficient. they cost a lot less to buy and install. the component spares cost a lot less to hold in store.. There is many a reciprocating motor (take your family car engine) ruinning well in excess of 2000 rpm every day without failing.
8. Replace vee belt drives with variable speed variable frequency drives. Vee belts use up tpo 5% of the energy in a drive. more if they slip or a re misaligned.

Regards

Geoff Stone

Design Detail & Development

R & D Team- B User <mrdbuser@tatachem.tata.com>@tatachem.tata.com> on 28/07/2001 07:38:28 PM

Please respond to <a href="/group/PipingDesign/post?postID=xvyQ-LHTzpQPRZ5SD2NItDMGJ1G6FwYVo0k4bTB3zEyB59gwT9iB5nnp58hzaCHO0tSYKjOZz-p1vCbgCre5p3wEJgxLGQ">PipingDesign@yahoogroups.com</a>

Sent by: R & D Team - C User <mrdcuser@tatachem.tata.com>

To: "'PipingDesign@yahoogroups.com'" <PipingDesign@yahoogroups.com> cc:

Subject: [PipingDesign] Pump efficency

  Today every plant people think about minimising production cost. Major cost factor in CPI is Power requirement.
To increase the pump efficiency what all modifications or controls are required so that we can reduce the power requirement for pump. Can anybody throw light on this topic.
Thanks in advance.
Hitesh

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Received on Mon Jul 30 18:47:00 2001