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Pump Maximum Flow Rate

Pump Maximum Flow Rate

(OP)
Hi, I would like to ask how to determine the maximum flow rate for Gorman-Rupp Pumps. Its not in the nameplate. Should I base it on the performance curve and take the reading on the maximum side of the operating range. Please advise. Thank you.

RE: Pump Maximum Flow Rate

There is normally a percentage value further to the BEP flow until where the pump can run safely.

What is the application that you are having? Are you able to share rated head, flow, speed? If you can post a pump curve it would also help.

RE: Pump Maximum Flow Rate

in general this would be listed on the pump data sheet.

If it's not there then I would use the end point on the curve.

Often max flow is limited by motor rating, but even within the numbers listed there might be high vibration or high NPSH to contend with.

Or just call them and ask them.....

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

RE: Pump Maximum Flow Rate

It seems as if the operating range shown in the curves you've posted set the limits to the minimum and maximum flows for which the pump can operate safely. So, like you said, I would go for the maximum reading of the operating range to determine the maximum possible flow.

You'll need also to keep an eye on the NPSH and power values deriving from your chosen flow. Your motor and suction conditions need to be suitable for them.







RE: Pump Maximum Flow Rate

Looks like a self-priming pump. Just a thought.... if this is on a lift operation, your flow will be VERY dependent upon the amount of lift you are trying to achieve.

RE: Pump Maximum Flow Rate

Agree 100% with engcorros.

Max flow through pump seems to be 80 to 90 m3/HR depending on speed.

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

RE: Pump Maximum Flow Rate

This is a self-priming contractors style pump. The curve clearly shows the suggested operating range - however being what it is and how this type of pump is quite often used (throw a suction hose in the sump and start pumping) min / max flow is usually never considered.
Under thus type of use and depending on discharge and suction head, the pump will / could run out along the curve until it cavitates - now it might hunt up and down the curve or conditions might just coincide with the curve and the unit might run OK. At the other end of the curve as the sump may empty, the pump will be operating at very low flow well up the curve and the pump will probably lose prime and snore until the sump level inreases and the sequence recommences.

If you would like to explain fully what you are doing / expect when you are likely to get better advice.

Edited:; the comment re. Operating up the curve is only applicable if you are pumping against a high static discharge head.
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: Pump Maximum Flow Rate

One would think that if you picked up the phone and called the manufacturer's representative and discussed the parameters of the installation, the manufacturer's representative should be able to quickly answer your question.

Asking the question on this forum with such little background information is akin to the game of twenty questions.

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