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Old March 7th, 2018, 09:37 AM   #1
bfranklin
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Boiler feedwater DP(kPa) to flow(m3/hr) calculation

All,

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, 10:41 AM   #2
gclshortt
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http://control.com/thread/1026237316

The above thread may help you out.
Regards,
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http://www.accautomation.ca
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Old March 7th, 2018, 11:10 AM   #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: https://www.engineeringtoolbox.com/o...uri-d_590.html
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