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Dear All,
Will you please explain me what is Capacity correction factor due to overpressure,Kb in orifice area calculation in PSV.How do we calculate this value.Please explain.
Thanks in advance.
Stu
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Kb Value In Psv Designing
Started by stu, Aug 25 2008 08:52 AM
2 replies to this topic
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#2
Owoidem
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Posted 25 August 2008 - 02:20 PM
Capacity correction factor for backpressure: Conventional (non-balanced) PSVs in critical (sonic) flow gas or vapor and conventional PSVs in any liquid service, Kb = 1.
To determine if flow is critical or sub-critical, refer to API RP520 Equation 1, (Ref. 51.3).
To determine if flow is critical or sub-critical, refer to API RP520 Equation 1, (Ref. 51.3).
#3
JoeWong
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Posted 26 August 2008 - 06:21 AM
Back pressure will tend to produce a closing force on the unbalanced portion of the disc. This force may result in a reduction in lift and an associated reduction in flow capacity. Capacity correction
factors, called back pressure correction factors, are provided by manufacturers to account for this reduction in flow....extracted from API RP 520 Part 1.
For preliminiary PSV sizing, graph in API RP 520 Part 1 can be referred.
factors, called back pressure correction factors, are provided by manufacturers to account for this reduction in flow....extracted from API RP 520 Part 1.
For preliminiary PSV sizing, graph in API RP 520 Part 1 can be referred.
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