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Acoustic Induced Vibration Assessment


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#1 kc45

kc45

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Posted 05 August 2022 - 02:30 AM

Hello!

 

I have a question regarding AIV assessment with reference to the EI guideline.

 

Referring to the attached file, I have a PSV relieving to the vent header (18" line) via a 16" line.

 

There is a 2" relieve point after the PSV. (See attached file for visual reference)

 

My question here is; for AIV assessment, is my next welded discontinuity the 2" connection or the point where the 16" line meets the 18" line.

 

 

Also, in this case my sound power level is pretty high due to high relieving volume. EI suggested to increase pipe schedule but I've tried going for the thickest thickness but the LOF is still more than 1.

 

What other typical measures is taken for a PSV flow that causes AIV issues?

Attached Files

  • Attached File  AIV.jpg   26.41KB   0 downloads

Edited by kc45, 05 August 2022 - 02:31 AM.


#2 Pilesar

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Posted 05 August 2022 - 12:29 PM

I've not done calcs like this, but that does not stop me from offering my opinion. The 2-inch line might affect the vibration positively or negatively but probably can be ignored since the main flow is through the large pipe. Consider calculations with both your options. Reviewing the results will help you determine which way is conservative and the magnitude of any differences in conclusions.



#3 breizh

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Posted 07 August 2022 - 09:15 PM

Hi,

You may want to drop an email to these guys ?

https://www.dnv.com/...brations-110735

 

Good luck

Breizh 






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