36'' butterfly valve stuck how to operate online?
36'' butterfly valve stuck how to operate online?
(OP)
36'' butterfly valve operated by motor in one of chemical company. during plant running time valve is stuck. We disconnect the Motor and try to close manually. But not possible to close 100% ONLY 44% closing. but we don't have any isolation valve ,so we need to solve by online. any one can give good ideas. Please...





RE: 36'' butterfly valve stuck how to operate online?
shetty0107,
You don't say where you are or what you have already discussed.
So I will suggest one option:
- Contact a "Hot-Tap Specialty Contractor.
- Discuss an Upstream & Downstream Stopple and Bypass arrangement.
- Drain the isolated portion with the Valve then cut it out.
- Replace the Butterfly Valve
- Remove the Bypass and Blind off the bypass connections.
Sometimes its possible to do all the right things and still get bad results
RE: 36'' butterfly valve stuck how to operate online?
Piping Design Central
RE: 36'' butterfly valve stuck how to operate online?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: 36'' butterfly valve stuck how to operate online?
Mr. Little inch: your correct saying. may be support broken or else slug. this is 42'' butterfly valve. and hydrocarbon line . thank you for suggestions.
RE: 36'' butterfly valve stuck how to operate online?
RE: 36'' butterfly valve stuck how to operate online?
What is the fluid service in the line?
Piping Design Central
RE: 36'' butterfly valve stuck how to operate online?
RE: 36'' butterfly valve stuck how to operate online?
The fact the line is 42" does not make a difference to my suggestion. Don't try to second the Hot-Tap people. Contact them and let them tell you what can and what cannot be done to correct your problem.
Sometimes its possible to do all the right things and still get bad results
RE: 36'' butterfly valve stuck how to operate online?
Are you ABSOLUTELY SURE the valve is actually rotating - I don't care what the inticator says, drive out to the valve and see what is really happening! Bad indicator, bad motor (have you changed it yet?), bad controller but good motor, bad motor power supply, bad clamp between motor/actuator and valve stem? You must eliminate every chance of any of those before continuing.
Also - can you stop flow in the pipe, then try closing (or opening) the valve again?
RE: 36'' butterfly valve stuck how to operate online?
RE: 36'' butterfly valve stuck how to operate online?
RE: 36'' butterfly valve stuck how to operate online?
RE: 36'' butterfly valve stuck how to operate online?
RE: 36'' butterfly valve stuck how to operate online?
It is impossible to work on "one-half" of a a stuck or jammed isolation valve that is itself isolating the fluid you need be protected from.