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Control Valve Flow Determine
#1
Posted 06 April 2020 - 12:38 AM
Suppose i need control valve of flow rate 10m3/hr. Now during designing we are considering Normal, Maximum and Minimum flow rate. So how to calculate this flowrate??
#2
Posted 06 April 2020 - 01:36 AM
Hi,
Control valve is sized for the following case
1) Max Flowrate and Min Press Drop
2) MIn Flowrate and Max Pressue Drop
Generally we know the Normal Flowrate, this is the Process requirement.
We add a design margin (lets say 10%) on top of normal flowrate to get the max flowrate i.e. Max Flow = 1.1 Normal Flowrate
Minimum flowrate is based on the turndown requirement i.e. minumum flow for which the plant needs to be operated (This generally is around 30%) i.e. Min Flow = 0.3 x Normal Flowrate. There are situations where this value can be zero as well.
#3
Posted 06 April 2020 - 03:16 AM
Hi ,
Attached links to support your work
https://www.control-...com/worksheets/
http://www.cheresour...g-and-selection
Good luck
Breizh
Edited by breizh, 06 April 2020 - 03:18 AM.
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