How to change valve under pressure ?
How to change valve under pressure ?
(OP)
I have 1/2" (male) valve that I have to change under 40 bar pressure !!
There is no way to close this part of gas line (natural gas).
It's actualy one-direction stop valve in shape of usual bolt with high six-side head.
How do I change this valve ?
Is there any tool for this operation ?
Thank You in advance ..
There is no way to close this part of gas line (natural gas).
It's actualy one-direction stop valve in shape of usual bolt with high six-side head.
How do I change this valve ?
Is there any tool for this operation ?
Thank You in advance ..





RE: How to change valve under pressure ?
There are specialist companies that do it for you. It is pretty amazing what the do.
RE: How to change valve under pressure ?
Go with hacksaw on this one. There are so many ways to kill someone with 40 bar that it doesn't bear contemplation. The experts will find a way to do something like installing a lubricator to insert a line stoppel and pull the valve out. Replace it with technology that works.
There is no cookbook way to do this and it takes a lot of experience and really specialized tools.
David
RE: How to change valve under pressure ?
Good luck.
RE: How to change valve under pressure ?
I agree with the other posts - It isn't worth getting someone killed to try this without a lot of experience. Even with an experienced contractor, you need to have a contingency plan in case something goes wrong. The worst case is usually that the line breaks while its being worked on. The plant operators must be ready with a plan in case this happens. Our on site contractor who handles these types of jobs for us is FlowServe. Check them out at http://www.flowserve.com/srvnrepair/line_stop_ani.asp
jt
RE: How to change valve under pressure ?
RE: How to change valve under pressure ?
http://www.carbertesting.com
RE: How to change valve under pressure ?
From answers above, the most I like is to inject some kind of gel, and freze it inside of gas line. Now I would like some recomendations what kind of gel, or other medium I could use for this, where can I buy it (I'm located in Europe) and other useful hints.
Thank you all, once again..
RE: How to change valve under pressure ?
RE: How to change valve under pressure ?