8 replies to this topic

[sn_sn]

is there any preference, where to install check valve in gas pipe? upstream of actuated valve or downstream of actuated valve? arrangement is manual valve, check valve, manual valve and pressure transmitter. we need to convert one of the manual valve to actuated valve which will be closed at high high pressure measured at pressure transmitter. so which valve should be converted to actuated valve? upstream of check valve or downstream of check valve

Edited by sn_sn, 26 May 2023 - 05:06 PM.

[Pilesar]

So the actuated valve is to be open all the time unless there is high high pressure detected? Then the location of the actuated valve will not affect normal operation and I don't think it really matters as long as you can block in the check valve for maintenance. I would probably choose to put the actuated valve closest to the source of the high high pressure unless there is reason for the other location.

[sn_sn]

Yes actuated valve to be open all the time unless high high pressure detected. need to decide which manual valve to be coverted to actuated valve. downstream of checkvalve or upstream of checkvalve.

[breizh]

Hi,

Tell us what your reasoning is, someone will acknowledge or not! 

Behave like an engineer, do not only bring open questions.

This is the way it works.

 

Note: The actuated valve should be close to the source.

 

Good luck

Breizh 

[sn_sn]

@Breizh already explained the reason. cant disclose confidential information about project. just was designing something and question came in my mind so asked. because i was confused what should be the solution. what wrong i did? where i didnt behave like an engineer? its upto you if you don't want to answer and share your thoughts. sorry if i did anything wrong here. happy to delete my account and will not ask any question in future if i did anything wrong here. this is the knowledge sharing platform. young engineers can ask any kind of question even if its silly or simple. you should not insult anyone and tell someone that behave like an engineer.

Edited by sn_sn, 27 May 2023 - 07:32 AM.

[breizh]

Hi,

I did not intend to insult you, my bad.

My point is the following, whenever possible describe the scenario with supportive documents, explain your proposal and ask for confirmation. 

Good luck in your engineering career.
Breizh 

[latexman]

With the PT, ABV and high pressure shutdown, do you still need the CK valve?  I realize CK valve is cheap backflow protection, and it may be easier now to leave it than remove it.  Maybe you need both for PHA or something.

 

Also, is the source of high pressure scenarios upstream of the PT, downstream of the PT, or both?  Just be careful when the ABV closes, it does not blind the PT of the pressure source(s).

[seuenergy]

It seems that you are designing one back flow protection with actuated valve (interlock with HH differential pressure) as well as check valve.

 

Actually, the loop (HH dp + logic + actuated valve) provide the credit for protection. And the check valve is not an independent protection layer. So there is no different for its location. It also can not change the pressure break point, so all the pipeline should be the same class.

 

But if you consider maintenance the check valve, you should select one point which isolation is easy to be done. 

 

This is not something confidential, it is just common engineering practice.

[ahmed abd elmonem]

Generally, I'd prefer to put the boundaries of any unit operation isolated by manual valves. thus any actuated devices to be inside this boundary. this is just a common practice in my career.

thanks