Pnumetic shutoff valves-mechanical or instrumentation

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panthripu

Member
Hi guys
Need your opinion and comments please.
There is a confusion here in our location. Who is responsible for the maintenance of pnumetic valves of various sizes from small to big. As a valve has its actuator,DC valve,limit switches and FLR , the limits and solenoids are taken care by electrical/instrument crew , however they insist that rest i.e. valve , actuator and air should be taken care by mechanical team thinking that its part of pnumetics.Whereas mechanical team says no everything should be taken care of by instrumentation mentioning that it completely an instrument .
What does your experience in various plants says ?
 
kwired

kwired

Electron manager
Location
NE Nebraska
panthripu said:
Hi guys
Need your opinion and comments please.
There is a confusion here in our location. Who is responsible for the maintenance of pnumetic valves of various sizes from small to big. As a valve has its actuator,DC valve,limit switches and FLR , the limits and solenoids are taken care by electrical/instrument crew , however they insist that rest i.e. valve , actuator and air should be taken care by mechanical team thinking that its part of pnumetics.Whereas mechanical team says no everything should be taken care of by instrumentation mentioning that it completely an instrument .
What does your experience in various plants says ?
Click to expand...
By nature electricians understand pneumatics better than the mechanics, not saying that means they should maintain them, but they do understand them better in many cases.
 
Smart $

Smart $

Esteemed Member
Location
Ohio
FLR = ???

I've seen multiple variations on what craft does what regarding AOV's (air operated valves). And there are projects where AOV specialists do all regarding large AOV's. In recent experiences, pipefitters set the valve body in process piping (actuator being attached), run air supply lines, sometimes signal air lines. Electricians only run conduit and pull wire. I&C takes care of everything else, including positioners, limit switches, calibration, commissioning. Some I&C crews are made of certified I&C pipefitters and certified I&C electricians, usually 1:1, and do it all.
 
kwired

kwired

Electron manager
Location
NE Nebraska
Smart $ said:
FLR = ???

I've seen multiple variations on what craft does what regarding AOV's (air operated valves). And there are projects where AOV specialists do all regarding large AOV's. In recent experiences, pipefitters set the valve body in process piping (actuator being attached), run air supply lines, sometimes signal air lines. Electricians only run conduit and pull wire. I&C takes care of everything else, including positioners, limit switches, calibration, commissioning. Some I&C crews are made of certified I&C pipefitters and certified I&C electricians, usually 1:1, and do it all.
Click to expand...
That is what often happens at installation, the OP is asking who is responsible for maintenance and troubleshooting.
 
Smart $

Smart $

Esteemed Member
Location
Ohio
kwired said:
That is what often happens at installation, the OP is asking who is responsible for maintenance and troubleshooting.
Click to expand...

And I said, "I&C takes care of everything else, including positioners, limit switches, calibration, commissioning." ... :huh:
 
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panthripu

Member
Pnumetic shutoff valves-mechanical or instrumentation

Shut off valve is not an instrument. Its part of pnumetic system. What about a pnumetic cylinder controlled by a DC valve. We never consider it as instrument then why the shut off valves. I agree about the control valves which includes electrical signal from controller,air signal from i/p controller and controls the valve at various positions. But shutoff valve....no way instrument.
 
Smart $

Smart $

Esteemed Member
Location
Ohio
panthripu said:
Shut off valve is not an instrument. Its part of pnumetic system. What about a pnumetic cylinder controlled by a DC valve. We never consider it as instrument then why the shut off valves. I agree about the control valves which includes electrical signal from controller,air signal from i/p controller and controls the valve at various positions. But shutoff valve....no way instrument.
Click to expand...
No one said a shutoff valve is an instrument... but it is a control.

Some industries do not recognize I&C (Instrumentation & Control) as a craft boundary, instead they see I&E (Instrumentation & Electrical) as the boundary. In the latter case, I&E would not be involved with a pnuematically-operated control component.
 
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