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Relief Valve Interlocking

prv psv piping interlock

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#1 Lapeche

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Posted 23 June 2021 - 03:39 PM

Hello everyone,

 

I am looking for articles with feedback/return-on-experience regarding relief valves interlocking:

- focusing on interlocks with key versus 3way valves, example here attached;

- advantages and inconveniences;

- reliability matters ;

- cost.

 

What readings would you recommend to me, please?

 

Thank you

 

 

Attached Files



#2 Bobby Strain

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Posted 23 June 2021 - 04:32 PM

Much depends upon the jurisdiction that regulates such things.

 

Bobby



#3 fallah

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Posted 24 June 2021 - 02:02 AM

Hello everyone,

 

I am looking for articles with feedback/return-on-experience regarding relief valves interlocking:

- focusing on interlocks with key versus 3way valves, example here attached;

- advantages and inconveniences;

- reliability matters ;

- cost.

 

What readings would you recommend to me, please?

 

 

API 520 Part II



#4 breizh

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Posted 24 June 2021 - 03:29 AM

Hi,

In the link attached you will find references to read : http://orangetech.co..._Protection.pdf

 

At the end it should be a decision from the owner and the management team . Cost should not be the issue . 

 

My view

 

Breizh 



#5 Lapeche

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Posted 25 June 2021 - 10:41 PM

Thank you for your replies.

Yes, I do know and use Standards such as API, ASME, and ISO.

I was aiming to collect a return of experience that would help to prove one option versus the other.

 

I have always used designs with interlocks on staggered relief valves, without any special operational issues. But when using 3-way valves, I already had one of these mechanically blocked, and therefore, impossible to make the relief valve change over, without shutting down the entire refinery steam main header.



#6 breizh

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Posted 25 June 2021 - 11:10 PM

Hi,

To me the answer is in your reply.

Review with your management team .

Good luck

Breizh 



#7 fallah

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Posted 25 June 2021 - 11:30 PM

 

I have always used designs with interlocks on staggered relief valves, without any special operational issues. But when using 3-way valves, I already had one of these mechanically blocked, and therefore, impossible to make the relief valve change over, without shutting down the entire refinery steam main header.

 

Please provide a brief description for: "Interlock on staggered PSVs" you have already used...

 

About the mechanically blockage of 3-way valve, have you periodically inspect it for ease and smooth operation?



#8 Lapeche

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Posted 01 July 2021 - 02:54 PM


 

Please provide a brief description for: "Interlock on staggered PSVs" you have already used...

 

About the mechanically blockage of 3-way valve, have you periodically inspect it for ease and smooth operation?

 

Thank you for your message Fallah,

This is the "piping arrangement" I am referring to, as an example:

Interlock_2_PSV.PNG

 

Unfortunately, I am afraid that no one is taking care of "smoothing" instruments.

 

Regards



#9 Lapeche

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Posted 01 July 2021 - 02:58 PM

Hi,

To me the answer is in your reply.

Review with your management team .

Good luck

Breizh 

Thank you Breizh,

sure it is, but with stubborn people, we often need a few more arguments.

I am going trough a few references on instrument reliability, I will let you know if something comes up.

 

Regards,



#10 Bobby Strain

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Posted 01 July 2021 - 03:55 PM

I don't understand what issues you are trying to address. An explanation will be of great help. You might also tell us your facility location.

 

Bobby



#11 Lapeche

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Posted 02 July 2021 - 03:04 PM

I don't understand what issues you are trying to address. An explanation will be of great help. You might also tell us your facility location.

 

Bobby

Bobby hello,

thank you for your message.

I am searching for references about instruments reliability, more precisely, about isolation valves used on relief valve change over.

The plant is in Europe, if it helps.



#12 Bobby Strain

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Posted 02 July 2021 - 04:30 PM

Before you go too far, you should determine what the relevant codes require. Do you have a preference that is hard to sell to your management? Or boss?

 

Bobby



#13 fallah

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Posted 02 July 2021 - 10:42 PM

 


 

Please provide a brief description for: "Interlock on staggered PSVs" you have already used...

 

About the mechanically blockage of 3-way valve, have you periodically inspect it for ease and smooth operation?

 

Thank you for your message Fallah,

This is the "piping arrangement" I am referring to, as an example:

Interlock_2_PSV.PNG

 

Unfortunately, I am afraid that no one is taking care of "smoothing" instruments.

 

Regards

 

 

Interlock is applied on Duty/Spare PSVs not on the Staggered PSVs in which following to relief load increment they will be opened one by one till all opened at maximum relief load...



#14 breizh

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Posted 10 July 2021 - 01:01 AM

Hi ,

Consider this reference where the author addresses  the use of a 3 way valve  (chapter 6) 

The safety relief valve handbook  by Marc HELLEMANS 

Hope this is going to help you

Breizh 



#15 Lapeche

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Posted 14 July 2021 - 02:46 PM

Hi ,

Consider this reference where the author addresses  the use of a 3 way valve  (chapter 6) 

The safety relief valve handbook  by Marc HELLEMANS 

Hope this is going to help you

Breizh 

Thank you again for the reference Breizh






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