Out of Round 8ft diameter butterfly valve
Out of Round 8ft diameter butterfly valve
(OP)
I need some creative ideas on how to repair/modify an 8ft diameter butterfly valve that is out of round (probably that way at initial construction). Valve isolates cooling water to section of power plant condenser. Leakage is too great to allow condenser maintenance downstream. Repair/modification would have to be done in situ. Any ideas or people to talk to.





RE: Out of Round 8ft diameter butterfly valve
Maybe you can reduce the flow without repairing the valve.. Can you find a way to insert and inflate a big-ass tractor inner tube or bladder upstream of the almost- closed butterfly?
... probably violates all kinds of safety rules.
Mike Halloran
Pembroke Pines, FL, USA
RE: Out of Round 8ft diameter butterfly valve
Are there other upstream valves that you can open to divert or reduce the flow to the bad valve to the point that repair work can be performed.
RE: Out of Round 8ft diameter butterfly valve
If you worried about repairing something downstream, there are companies out there that can freeze water inside the pipe so you can do repairs and maybe add other isolation valves so you don't have to do this again.
Do a search on here I think it was discussed not to long ago. I am sure it isn't going to be cheap though.
Zuccus
RE: Out of Round 8ft diameter butterfly valve
The valve was repaired at make-shift repair shack/lean-to at the site.
The valve fabricator had bolt holes at one flange end filled with weld filler metal and holes were redrilled thru undisturbed steel to suit field bolt-up requirements.
I do not recall the intended service of the valve but it must of been very low pressure system for client to buy off on repair. At very large diameter the numbrer of bolt holes can be overwhelmiing
RE: Out of Round 8ft diameter butterfly valve
RE: Out of Round 8ft diameter butterfly valve
http://www.barsproducts.com/
not sure if comes in tank car packaging.
RE: Out of Round 8ft diameter butterfly valve
RE: Out of Round 8ft diameter butterfly valve
RE: Out of Round 8ft diameter butterfly valve
I haven't checked lately but there may be places you can rent a plug. Also there are several other people that make large pipe plugs with inflateable seals.
http://www.sealfastproducts.com/products.htm
RE: Out of Round 8ft diameter butterfly valve
rmw
RE: Out of Round 8ft diameter butterfly valve
In my opinion: very difficult in any case to repair inline. Shut-down and replacement recommended.