globe valve with spool blind query 1

[hswang2]

Dear Sir/Madam
I attached part of the P&ID from my project.

Could anyone kindly tell why is the valves and blind flanges set there together? Is any reason behind this?

Thank you so much.

 

[unclesyd]

It looks like a spectacle blind that could be used to isolate the equipment for maintenance work.

We have many of these around our facility, in fact we have this arraignment on all of our plate heat exchangers for ease in the cleaning and changing gaskets.

 

[pennpiper]

unclesyd is correct about the "Blind" symbol.

You should find and study the "Legend" Sheet that normally is included with any set of P&IDs.

A. I think that the valve you are concerned about is a "Ball" Valve not a Globe Valve.

B. The "Spec Blind" at the Drain valve is installed in the closed position.

C. The "Spec Blind" in the Incoming Feed line is installed in the open position.

 

[StewPad]

Spectacle blind AKA figure-8 blank AKA Madka AKA scissor blind - Use the same pipe and valve flanges

-so your "skilled" engineer won’t open the solvent line on the maintenance guys.

-add a line in your check list to check them before starting up.

 

[sheiko]

Another subject: i would add a second drain between the control valve and its downstream block valve, because, the control valve is fail close.

"We don't believe things because they are true, things are true because we believe them."