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Old Sep 20th 2018, 02:01 AM   #1
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Calculating Flow Coefficient

Hello,

I need help calculating the flow coefficient through a pressure reducing valve DN20.
The values I currently have are:
Inlet Pressure: 5 bar
Outlet Pressure: 2.75 bar
Flow capacity: 322kg/hr

According to this website below, the density of steam at 5bar is 2.667 kg/m3
Saturated Steam

Using these values, I substituted it into this website to help me calculate the CV value and the result I got was 4.9.
https://www.tlv.com/global/AU/calcul...ce-cv-kvs.html
However, when I manually substitute all the data into the first equation of that page I get an answer of CV=5.6

Why is my flow coefficient so inaccurate? Thanks.
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Old Sep 21st 2018, 05:02 AM   #2
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Is it gauge or absolute pressure?

You also have to know the specific heat
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Last edited by mscfd; Sep 21st 2018 at 05:08 AM.
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