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Pilot Operated Pressure Relief Valve - Change Over

mechanical isolation

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#1 augustine123

augustine123

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Posted 11 February 2016 - 02:37 PM

Dears,

 

I am working in a process industry, I would like to know how to change over pilot operated pressure relief valve from one to another for hand over to maintenance. I am caught between experienced operators who say  ( A and B  PRV Valves ) initial A isolated and B in line - To start change over first open pilot A..then main A .. close main B then pilot B.

 

Some others say Open Main A, Open Pilot A, close pilot B then main B. 

 

I am confused, i am aware of the working. Please guide.

 

Cheers

 

Franck.



#2 Bobby Strain

Bobby Strain

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Posted 11 February 2016 - 06:03 PM

Think it through. The correct sequence will then be obvious. If you get it wrong, you will know soon enough. Just don't do anything to the active valve first.

 

Bobby



#3 manojkaila

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Posted 14 February 2016 - 07:41 AM

Dear Franck

 

If your are changing from A to B sequence should be as below.

 

1 Open the isolation valve of Pilot B.

2 Open the isolation valve of Main B.(I believe outlet valve is already open)

3 There should not any pop up or up set it means your valve working fine.

4 Close the isolation valve of Main A.

5 Close the isolation valve of Pilot A.

6 Close the outlet valve of Main A. Depressurize A and hand over to maintenance.

 

I hope this will hlep

 

Good Luck

 

Manoj



#4 Bobby Strain

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Posted 14 February 2016 - 10:05 AM

Manoj,

     You didn't quite get it right. Close, though.

 

Bobby






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