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Pressure Safety Valve Test Interval


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#1 samroo

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Posted 29 December 2015 - 02:51 PM

Dear,

working in gas processing facility as utility operation engineer. we have high pressure boilers producing steam of 40 bar. The test intervals for the boiler PSV is 01 years. After 01 year each boiler PSV is tested to atmosphere. Is it possible to change the interval to 02 years and is there any standard for PSV test intervals? Please provide your valuable inputs



#2 Bobby Strain

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Posted 29 December 2015 - 03:54 PM

So, where is the facility? There is usually a government entity responsible for enforcing related regulations. So, check with them.

 

Bobby



#3 latexman

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Posted 29 December 2015 - 07:19 PM

samroo,

 

Also, you may want to study Risk-based inspection (RBI).  Google it.



#4 breizh

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Posted 29 December 2015 - 08:31 PM

Samroo,

You need to check your local regulation , to me you cannot change the interval without involving the authorities in charge. You mentioned test to atmosphere but what about calibration ?

 

Breizh



#5 samayaraj

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Posted 29 December 2015 - 11:06 PM

Many of the safety valve calibration is done offline which will reduce the plant output due to release of steam. I hope you want to increase the calibration span to avoid reduction in the plant output. If this is the case, you can go for online safety valve testing. It is otherwise called as "Trevi Test". Just google it, you will find lots of information on this. In Trevi Test, your plant output will not get disturbed as there no steam release while doing this test. The only negative in this test is, you cannot check the reset pressure.



#6 samroo

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Posted 30 December 2015 - 01:17 AM

Thanks  for your replay. the facility is in middle east and the after  one year boiler is off lined from the steam header and steam drum pressure increased till PSV lift to atmosphere and then bring the pressure to normal and connected to the steam header. No plant production interruption owing to have stand-by boiler. please comment 



#7 dutru

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Posted 02 February 2016 - 08:15 PM

The first step would be to check with local legislation, and I assume that you have done it already.

If the local authority allows, risk based method can be used to extend the PSV testing interval. Now you have two choices:

- The quantitative API 581 method: this one requires PSV testing data and procedure to meet with certain requirements, and most of the time the calculation is complex, confusing, and takes long time

- The qualitative risk based method proposed long time ago by BP, and since has been adopted by other companies such as Premier Oil, KNOC, Conocophillips. You should refer to BP GN31-008 for more information.

 

There is another sub-option of the qualitative method, which was developed by a consultant named  Centrica Energy, using a different flow chart than BP but same philosophy. I'm not sure, though, where this method is actually used.


Edited by dutru, 02 February 2016 - 08:16 PM.





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