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Vacuum Breaker


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Posted 06 November 2019 - 07:24 AM

Dear all,


We want to check a vacuum breaker capacity for column operating at -5 KPaG.

Our System is, vapor feed goes to column --- overhead of column is connected to blower and operating pressure of column is -5 KPaG.



As per API 521, 5th edition, section 4.6, It states that vacuum relief is required for


"Removal of vapor from a vessel by attachment to pumps/compressors, or by attachment to equipment

capable of pulling a vacuum (whether by design, such as vacuum pumps and ejectors, or inadvertently
such as vent-collection systems where the flow of material along a header can induce a vacuum in other



Now, our system is similar to this, and we want to check adequacy of the existing installed vacuum breaker on the feed line.


But, we are not able to find any co-relation or equation in regards to calculation of the air-flow required.

Any guidelines in this regards will be helpful.


Thanks in advance,





Edited by CSNK, 06 November 2019 - 07:25 AM.

#2 breizh


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Posted 06 November 2019 - 08:38 AM

Hi ,

Why don't you check your technical dossier and or the purchase order of this piece of equipment ? You should have specification attached and or reference to call the vendor for support.

A sketch will save words , please submit it for us to understand .


My view




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Posted 07 November 2019 - 08:28 AM

I am trying to contact vendor, but a simple sketch is attached for reference.

But some initial calculation is what i was trying.

#4 breizh


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Posted 08 November 2019 - 04:26 AM

hi ,

You may find software from Protectoseal or Groth , probably others ,on the web. You need to be familiar with this kind of tool !!

To me the most important is the scenario to size the equipment , only you can select it .

Good  luck.


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