Using a Pump Curve w/No Design Data
Using a Pump Curve w/No Design Data
(OP)
I need to justify the repair of a branch of an existing well water line in our plant. We are currently running city water to the areas this failed branch supplies and have meters to provide daily use requirements. I know what it's costing me to supply city water on a daily basis to these areas. Now I need to see what it's going to cost me to pump it from our well. The problem I have is that I have no design information from the original well installation. I have no pump discharge pressure or GPM data, so I am finding it hard to plot my operation point on the pump curve in order to obtain my pump efficiency in order to calculate my costs.
Long story short (too late) should I just assume the pump to be running at the BEP? If not, any suggestions on filling in the blanks? Although I know my daily well water consumption, I feel it would be incorrect to just calculate the average GPM for a 24 hr period as demand varies throughout the day.
Thanks for any help.
Long story short (too late) should I just assume the pump to be running at the BEP? If not, any suggestions on filling in the blanks? Although I know my daily well water consumption, I feel it would be incorrect to just calculate the average GPM for a 24 hr period as demand varies throughout the day.
Thanks for any help.





RE: Using a Pump Curve w/No Design Data
Have your process flows changed since the well system was shut in? If the process volumes have not changed since then, probably the well system will support your needs today and you might be able to assume you will operate close to BEP. If not, consider the possibility of changing the pump. A quick sensitivity analysis of how the efficiencies affect the results will give you an idea of how much you could save by changing the pump to a model with a more exact efficiency match.
http://virtualpipeline.spaces.msn.com
RE: Using a Pump Curve w/No Design Data
For the exercise you are doing of comparing cost it is far more important to consider the efficiency of your system, head and Q than the efficiency of your pump.
You need to describe the system in more detail.
RE: Using a Pump Curve w/No Design Data
http://virtualpipeline.spaces.msn.com
RE: Using a Pump Curve w/No Design Data
Make a list of all your pumps, with Brand, Service and serial number, request Pump Performance to suitable pump manufacturer. They will provide performance curves, and all data to start a correct analysis.
To make Performance Curves in Field or Plot a operations points to verefy how much energy is lost, you will need to
measure capacity, presures (discharge amd suction) and amperage.
When you finally draw your duty points in Performance Curves, you realize if you are losing high Energy levels or not.
RE: Using a Pump Curve w/No Design Data
RE: Using a Pump Curve w/No Design Data
Yes, absolutely. No point "running out on the curve" giving specific advice that depends on unknown details.
http://virtualpipeline.spaces.msn.com