need a pressure drop on discharge side of pump

[13thzodiac]

Hi
i am new to the pump calculations and in my application i have a pump which is discharging water at 100 psi. i want to reduce this pressure to around 60 psi.
what is the best way to do it.

Thanks in advance for your help

 

[JRLAKE]

More info needed to offer the correct answer which may include trimming an impeller, reducing speed, throttling, etc. Pump curve and flow requirements would be a nice start.

 

[djack77494]

If this is an existing pump, you could consider a pressure reducing valve. For a new pump, you'd be better off if you did not overdesign it and followed JRLAKE's suggestions.

 

[BigInch]

Your 40 psi drop could be a lot of energy wasted, which might even pay for a new properly sized pump over a very short time.

You're probably wasting 40% or more of your pump's power supply. Exact number depends on the pum's efficiency at whatever flowrate you have.

At least ask yourself, "what's the cost of that wasted power over the next 3-5 years or so?"

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

 

[hydtools]

Reduce the system load to reduce the demand on the pump. I'm guessing your system requires the 100psi to push the flow rate through it.

Why do you want to reduce the delivery pressure?

Ted

 

[JRLAKE]

If you reduce the system load the pressure will more than likely increase.

We need way more info to offer the correct answer.

 

[waterexpert]

Have you considered fitting a Variable Speed (Inverter) Drive? This can reduce pump output in a power-efficient way.

Regards
Seán

http://www.expertise-limited.co.uk/

 

[pumpking]

As you will see there are many ways to reduce pressure, however, some posts are right, we need much more information, before definite advice can be given, what pump is it, what does the performance curve look like, do you still need the same flow ? Can your product allow restrictions in the system to 'loose' pressure, what is the product and are there any velocity issues to consider ? If you can re-post with full details of what you have, what you want to do, then im sure you can get some more thorough advice.

Ash Fenn

http://www.cdrpumps.co.uk