Pressure Gauge Readings at Pump Suction and Discharge?
Pressure Gauge Readings at Pump Suction and Discharge?
(OP)
Hi all,
I am fairly new to this forum and need your help to clear my confusion surrounding the pressure gauges reading at pump suction and discharge?
1. How can I determine what would be the pressure gauge reading at pump discharge?
2. Is the pressure gauge reading at pump suction equals to NPSHa?
3. Can I determine TDH using gauge readings?
Appreciate any help.
I am fairly new to this forum and need your help to clear my confusion surrounding the pressure gauges reading at pump suction and discharge?
1. How can I determine what would be the pressure gauge reading at pump discharge?
2. Is the pressure gauge reading at pump suction equals to NPSHa?
3. Can I determine TDH using gauge readings?
Appreciate any help.





RE: Pressure Gauge Readings at Pump Suction and Discharge?
Or, Pdischarge = Psuction + pump tdh, so you can figure it from there.
2 No. Not even close.
3 Yes : Pdischarge - Psuction = tdh if the pump is running (don't forget to resolve units of measure)
RE: Pressure Gauge Readings at Pump Suction and Discharge?
I actually would like to calculate the pressure reading at the pump discharge by having following info:
- flow
- pump centerline elevation - Hp
- discharge pipe elevation - Hd
- Friction loss on discharge pipe - HLd
Can I say:
Pressure reading at pump discharge = (Hd - Hp) + HLd
Should I add velocity head too?
RE: Pressure Gauge Readings at Pump Suction and Discharge?
Suction Pressure
+ Pump Head added at a given flowrate,
convert to pressure
(see your pump curve)
Usually ignoring velocity head isn't a problem.
Now go have a look at http://www.mcnallyinstitute.com
There's tons of "how to" info on the pages there.
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure Gauge Readings at Pump Suction and Discharge?
Don't forget to add the destination pressure to (Hd - Hp) + HLd.
"We don't believe things because they are true, things are true because we believe them."
RE: Pressure Gauge Readings at Pump Suction and Discharge?
That info gives you the system head, not a "pressure reading at pump discharge", and that only if there is no outlet head and the pipeline is flat.
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pressure Gauge Readings at Pump Suction and Discharge?
rmw