Pump Protection
Pump Protection
(OP)
I have gathered a couple of things from this forum, as well as from reading.
Deadheading or low flow - BAD
High flow to the right of BEP - BAD
Ashcroft makes a differential pressure switch with 2 independently adjustable setpoints. I am thinking of using such a device on a transfer pump. I would set one switch to open below a certain differential pressure (high flow) and set the other to open above a certain differential (low flow). I would put a spring-loaded bypass contact around the low pressure switch in order to allow the operator to start the pump.
This almost seems too easy. Am I missing something?
Deadheading or low flow - BAD
High flow to the right of BEP - BAD
Ashcroft makes a differential pressure switch with 2 independently adjustable setpoints. I am thinking of using such a device on a transfer pump. I would set one switch to open below a certain differential pressure (high flow) and set the other to open above a certain differential (low flow). I would put a spring-loaded bypass contact around the low pressure switch in order to allow the operator to start the pump.
This almost seems too easy. Am I missing something?





RE: Pump Protection
DP switches are a pain to operate/calibrate, we have gotten rid of ours and put in pressure transmitters. The PLC subtracts the two pressures and decides high/low shut ins, easy to install and maintain, and they always work.
RE: Pump Protection
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Pump Protection
RE: Pump Protection
If you need any more information, let me know and i can mail something through to you.
RE: Pump Protection
A switch could be mounted on the arm of the check valve unless a non slam annulus type is being used. These are really good to prevent damage due to waterhammer.
A non invasive method is an ultrasonic flow switch, strapped on. Several companies make them. If there is a flow meter in the line use that.
Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng
www.waterhammer.bigblog.com.au