Effect of Atmospheric Pressure on Pump Lift
Effect of Atmospheric Pressure on Pump Lift
(OP)
I am sizing a small jet pump to lift a low flowrate of water into a building for a temperature measurement.
The problem is that a high amount of lift is required.
I have a pump selected that has a good amount of lift but the disclaimer says the capacities are given at near sea-level conditions.
The location is at 481 m above sea level and I am wondering what impact this elevation difference will have on the suction lift?
Thanks!
The problem is that a high amount of lift is required.
I have a pump selected that has a good amount of lift but the disclaimer says the capacities are given at near sea-level conditions.
The location is at 481 m above sea level and I am wondering what impact this elevation difference will have on the suction lift?
Thanks!





RE: Effect of Atmospheric Pressure on Pump Lift
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Effect of Atmospheric Pressure on Pump Lift
I tend to throw in my 2 cents worth (and I have a handful of pennies).
How accurate does the reading have to be? Would pumping a low flowrate stream into a building affect the reading to a degree that you'd consider significant?
Have you considered putting the thermometer/thermocouple/RTD into the bulk of the stream?
RE: Effect of Atmospheric Pressure on Pump Lift
RE: Effect of Atmospheric Pressure on Pump Lift
"The problem is that a high amount of lift is required" --is this suction "lift" or are you referring to discharge head?
At 481m ASL the effective maximum suction "lift" achievable from any pumping system will reduce by something like 0.7m.
RE: Effect of Atmospheric Pressure on Pump Lift
Is there something wrong with jet pumps?
Where did you get 0.7m from?
RE: Effect of Atmospheric Pressure on Pump Lift
Absolutely nothing wrong with jet pumps in the right application - however, as your application is not fully explained would you be better served with a standard pump?
Where is the eductor(jet)located in your pump system - at the pump inlet or external to the pump (at the inlet to the suction pipework)?