Flowrate in a vertical straight up-and-down pipe
Flowrate in a vertical straight up-and-down pipe
(OP)
Hello. Does anybody know how to determine the direction of the flow in a straight pipe with 1 globe valve knowing its diameter, length, and pressure (at each end is the same)?
Thank you.
Thank you.





RE: Flowrate in a vertical straight up-and-down pipe
RE: Flowrate in a vertical straight up-and-down pipe
I have been trying to apply different assumption to understand why the pressure drop is equal to 0? Might it be a pump?
RE: Flowrate in a vertical straight up-and-down pipe
At no flow, the lower gauge will read 13 psig greater than the top gauge.
During flow from top to bottom when the total pressure drop equals 13 psid across the 30 feet the top gauge will read the same value as the lower gauge.
RE: Flowrate in a vertical straight up-and-down pipe
Thank you.
RE: Flowrate in a vertical straight up-and-down pipe
This is not true for gravity pipes such as danw2 is describing, where one end is open to the atmosphere. There, you are measuring static head, not dynamic head. Normally, there should be some head loss across a globe valve. This can be measured by installing pressure gauges on each side of the valve.
For a situation that you are describing (probably a low flow scenario), the only method to determine flow is with a flow meter.
RE: Flowrate in a vertical straight up-and-down pipe
RE: Flowrate in a vertical straight up-and-down pipe