Shutdown Interlock Numbering on P&IDs
Shutdown Interlock Numbering on P&IDs
(OP)
Hi,
Is there a good way to develop Interlock numbering schemes on P&IDs. Should it be done on an equipment by equipment basis ?
Like a high level transmitter in a vessel has the same interlock number as the inlet SDV. The low level transmitter has the same interlock number as outlet SDV.
Please advise if anybody has used a good system and it served the best purpose.
Thanks,
RM
Is there a good way to develop Interlock numbering schemes on P&IDs. Should it be done on an equipment by equipment basis ?
Like a high level transmitter in a vessel has the same interlock number as the inlet SDV. The low level transmitter has the same interlock number as outlet SDV.
Please advise if anybody has used a good system and it served the best purpose.
Thanks,
RM





RE: Shutdown Interlock Numbering on P&IDs
Use separate logic diagram for the interlocks - there really isn't room on a P&ID to show complete logic.
Then put the logic diagram number in the interlock diamond.
If it is a long number you need only use the last few digits if you have a suitable drawing numbering scheme.
Francis
www.controldraw.co.uk
www.s88control.blogspot.com
RE: Shutdown Interlock Numbering on P&IDs
Best regards Morten