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Old March 7th, 2018, 10:37 AM   #1

bfranklin is offline
Join Date: Sep 2012
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Boiler feedwater DP(kPa) to flow(m3/hr) calculation


My client is looking to have me calculate the boiler feed water differential pressure in kPa to and actual flowrate in m3/hr.

Once the actual flow rate is derived, the flow rate goes into a custom function block which will get pressure and temperature (density) compensated.

The current conditions are:
DP: 42 kPa
Orfice ID: 40.4241mm
Pipe ID: 76.2mm

Control system:
Control logix L74 Version 20
HMI: Factory Talk SE Version 9

Could someone please provide me with the correct formula?
Also a solution to the equation with the parameters listed?

Thanks so much!
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Old March 7th, 2018, 11:41 AM   #2

gclshortt is offline
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The above thread may help you out.
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Old March 7th, 2018, 12:10 PM   #3
Tom Jenkins
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Th full details for the calculation are included in ASME PTC 19.5. It is probably worth it for your employer to purchase this standard.

This link may help:
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