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Information to put into a pump class

Information to put into a pump class

(OP)
Hello all,
I am writing up a powerpoint/class for our operations department here at our terminal. I will be covering the very basics of positive displacement and centrifugal pumps, hydraulics, and troubleshooting. I was looking on here for some literature to browse and use in my presentation and class. I found one thread that looked like it seemed like the perfect answer, http://www.eng-tips.com/viewthread.cfm?qid=329781. It is missing a file that supposedly answered many common questions about pumps. Can anyone reupload this file so that I can touch on pump information that relates to a lot of common questions, especially from people who are operating the pumps.

In short, I'd like to let our pump operators know WHY they are running pumps certain ways, instead of just WHAT a pump is. I feel this will be vital to understanding and being interested in the topic.


Any information to help this along would surely help. And if the powerpoint would be helpful to anyone else, I could always upload it after.

Thank you,

RE: Information to put into a pump class

Attachment doesn't show up for me either, but Artisi is still around and may respond.........

RE: Information to put into a pump class

I can not locate it either - will look further - but in the mean-time look at this one http://www.pump-magazine.com/index.htm - it has a wealth of info .

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

RE: Information to put into a pump class

(OP)
Thank you all for the links, I have saved them all and added them to my folder. I notice most information that I find on overall pump fundamentals and information deals with centrifugal pumps. We have plenty of positive displacement pumps here, but they seem more difficult to find. I will start to go through the articles posted soon. I will mainly be looking for information to explain what goes wrong within pumps and the fundamentals on why pumps fail or burn up or deteriorate based on bad operation. We are trying to train our guys to know how they are damaging the pumps when they misuse them.

Thank you all for the replies, I will start looking at these links!

RE: Information to put into a pump class

That's probably because there are a lot more centrifugals around....

PD pumps tend to be fairly robust, but clearly operating out of range or dirty fluid will do you no good.

Loss of inlet pressure, running dry, running against a closed head are to be avoided.

In many cases when something goes wrong, it's often not the pump, it's the system around it / how you operate it.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Information to put into a pump class

(OP)
Yes, you are correct, I don't mean to say it's the fault of the pump. But we have not been operating them properly and it leads to pump repairs, seal repairs, etc. I am trying to get them to understand what actually happens to the pump when it is operated incorrectly, so that they get a better understanding of damages they cause. And hopefully some of this information will be in the links provided.

Thanks, as usual, LittleInch for the consistent responses on this forum.

RE: Information to put into a pump class

I do some lecturing on things like this and one of the key issues which is hard to get across to people is that umps don't come in packages of flow (at least centrifugals don't)

Many people think if you have a pump doing 400 X/hr then you add two more in parallel you'll get 1200 X/hr.

Of course for PD pumps that is what happens, but then pressure will vary to meet the resistance to flow, be it height, friction or the pressure of whatever is on the end of the pipe.

For all intents and purposes centrifugal pumps are constant pressure devices (in a 20% band) and PD pumps are constant flow devices, in a 10% band.
If they get that then you'll have made progress.

Then talk about inlet pressure, cavitation, pulsation, low flow, high flow etc

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

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