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The Light Green Machine Institute
Weekly
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Check out Nip Impressions weekly
|  | Nip Impressions� is Paperitalo Publications' flagship publication. Published every Thursday afternoon (US Eastern Time), Nip Impressions� is eagerly read by pulp and paper professionals around the world and is ranked the No. 1 website in the industry by Alexa.
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3 April 2013:
Variable Speed Pump Drives
|  As we have stated previously, we are going to be taking the ideas developed in this column over the last couple of years and developing them into design practices. This is how it works. We will provide the basic narrative here for one design practice each week. We will keep it open for comments for one month. After that, we will finish it in formal form and offer it for sale at a modest price. Here is where you come in. If you make a substantive contribution to a standard, the organization for which you work will be granted a pro bono license to use that standard with its current issue number for as long as you like. We have had good response so far! Contribute, please
This week's:
Variable Speed Pump Drives (LGM 2013.013.01
when issued)
Reference:
Variable speed drives (VSD) pumps offer higher efficiencies, reduction of energy usage, elimination of control valves and bypass lines, improved process control and lower maintenance.
Objective:
To use variable speed pump drives.
Consideration:
Motor-driven equipment accounts for approximately two-thirds of electricity consumption in the industrial sector, therefore energy losses in the system can be reduced by improving motor efficiency for pumps. Throttling the output with a valve that controls the (fixed speed) pump output is a common method rendering significant energy losses. Most existing pumping systems are oversized, many by more than 20%, thus providing substantial opportunity for systems optimization.
Variable speed drives (VSD) pumps offer higher efficiencies, reduction of energy usage, lower initial equipment cost, lower life cycle costs, easier control and less maintenance. Potential use in the pulp and paper industry is to control the fan pump in the approach section. Fan pumps must also be able to vary the flow over the entire range of paper machine operation because of change in product requirements or operating conditions. Pulp stock pumps should be chosen to run at the lowest speed possible to achieve stable operation which many not prove to be efficient. Good pump selection is primarily concerned with reliability, with efficiency and costs as secondary considerations.
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As always, your comments will be appreciated.
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Think light!
Brian Brogdon, Ph.D.
Executive Director
or
Jim Thompson
Founder
Send us your comments!
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Disclaimer
LGMI Weekly Ideas are presented for your consideration and inspiration only. It is solely your responsibility to check for engineering correctness, applicability, standards, insurance policy and local, national or any other legal compliance required before implementing. Neither The Light Green Machine (TM) Institute, Paperitalo Publications, Talo Analytic International, Inc., nor any individual associated with these entities accepts any responsibility for your application or compliance issues.
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