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Api 521 Noise Calculation

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#1 nhcf


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Posted 07 March 2019 - 11:47 AM

Section provides calculations for estimating noise from a discharge pipe.  The equation uses "L", sound pressure level, which is taken from Figure 18, and based on a pressure ratio = absolute pressure upstream of relief valve/absolute pressure downstream.  The figure only shows ratios up to 10.  What is the "L" value for conditions where the PR is > 10.  For instance, 750 psi line venting to atmosphere, 764.7/14.7 is > 10.  Is the calculation no longer valid?



#2 jakes


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Posted 21 July 2020 - 11:11 AM

Hi! Did you ever come up with an answer to this? I am wondering the same thing.

#3 breizh


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Posted 22 July 2020 - 05:45 AM


Consider the doc attached , you may find pointers.

Good luck


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Edited by breizh, 22 July 2020 - 05:46 AM.

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