isolation procedure

[IPSS]

I was wondering if there are any standards that should be followed when we need to classify valves that need to be locke closed/open?
On what basis should the classification be done?

Thanks a lot and I hope to see your comments/ experience at work on the matter.

Greetings wa salam,

Brahim

[luster]

The best way is to find isolation procedure from one of famous companies like AGIP, BP, Shell or similar. Search through this forum or somewhere else, read and link up through referent literature inside procedures (they are always calling standards and rules through text). In the philosophy section you will see which equipment and processes must be treated in manner you explained above. (example: pig traps, reservoirs in parallel....). At the end you can search manufacturers and you will also see a lot of interesting and useful info though examples which they use often as reference or advertisement.

[jokull]

I think you're trying to "mark" valves in a process in order to avoid human error or unauthorized manipulation of them. If so, then such marking would be based on:
1. the normal operation mode documented in the process manual.
2. a risk analysis which evidenced that some valves must remain open/locked in order to have a safe operation.
3. frequency of unauthorized/incorrect valve position.

Hope this information help you.

Regards.

[jokull]

I think you're trying to "mark" valves in a process in order to avoid human error or unauthorized manipulation of them. If so, then such marking would be based on:
1. the normal operation mode documented in the process manual.
2. a risk analysis which evidenced that some valves must remain open/locked in order to have a safe operation.
3. frequency of unauthorized/incorrect valve position.

Hope this information help you.

Regards.