Accurate Differential Water Pressure Measurement
Accurate Differential Water Pressure Measurement
(OP)
When measuring differential pressure across a set of heat exchanger tubes in the 3 to 6 psi differential pressure range, what are the best practices to obtain an accurate measurement?
Then when using the information to define and use a Cv value to measure flow what is the typical accuracy that one can expect?
Are there articles and or instrument suppliers guidelines available on this subject?
Then when using the information to define and use a Cv value to measure flow what is the typical accuracy that one can expect?
Are there articles and or instrument suppliers guidelines available on this subject?





RE: Accurate Differential Water Pressure Measurement
I would have a cross on the inlet and outlet feed pipes.
Use 2 identical pressure gauges on the inlet and outlet. Make sure these gauges read identically, through prior testing, known values etc. As a backup, if dP is what's really important, i would use a dP pressure gauge connected to the 4th leg on each of those crosses.
You should be able to use some clear tubing, or if it's feasible swagelok tubing and setup your dP gauge across the HX.
This way, you have 2 measurements, that will give you the same result.
RE: Accurate Differential Water Pressure Measurement
RE: Accurate Differential Water Pressure Measurement
RE: Accurate Differential Water Pressure Measurement
Because I was thinking a simple analog, magnahelix style dp gauge would work. They make gauges for liquid dP measurements, and are very sensitive in the 0-5 psi range.
RE: Accurate Differential Water Pressure Measurement
RE: Accurate Differential Water Pressure Measurement
If you want very simple measurements like the old days you could go to a u-tube manometer and have some fun when you blow mercury allover the area..
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RE: Accurate Differential Water Pressure Measurement
Where is the sensor?
RE: Accurate Differential Water Pressure Measurement
This one is rated for use with water:
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