60 inch butterfly valve with a drain?
60 inch butterfly valve with a drain?
(OP)
Greetings friends,
Needed a little help we have a 60 inch butterfly valve in a flare line which is passing it has got a small bore gate valve connected to it right opposite the drain we just wanted to know the purpose of the valve can any one tell me what's the purpose of small bore valve attachef to the butterly valve & is it safe If we inject sealant to it to stop passing the isolation is required in order to reverse spectacle blind downstream to isolate a drum
Needed a little help we have a 60 inch butterfly valve in a flare line which is passing it has got a small bore gate valve connected to it right opposite the drain we just wanted to know the purpose of the valve can any one tell me what's the purpose of small bore valve attachef to the butterly valve & is it safe If we inject sealant to it to stop passing the isolation is required in order to reverse spectacle blind downstream to isolate a drum





RE: 60 inch butterfly valve with a drain?
On large municipal water valves, they frequently have a small bypass valve. I've understood in the past that the purpose of that valve was to let them relieve some of the pressure differential across the main valve to make the main valve easier to operate. That seems to be an application not considered in the link there.
RE: 60 inch butterfly valve with a drain?
RE: 60 inch butterfly valve with a drain?
This sounds VERY dangerous in a flare line 60 inch in diameter!
You have a bypass valve that is leaking (I think) around a flare line (safety release line right?) main valve, and you want to inject (an unknown) sealant into the bypass/vent valve inlet upstream of a spectacle flange, just so you can insert a blind flange in the spectacle flange location? Do you propose continuing to operate under this condition?
RE: 60 inch butterfly valve with a drain?
RE: 60 inch butterfly valve with a drain?
Pressure gage point? Relief valve point? Test point for checking the seals periodically?
Sample point not likely: Why would you sample a non-flowing, trapped and isolated part of the product being produced. Vent point if on top. Drain if below.
RE: 60 inch butterfly valve with a drain?
We have no type, no vender, no drawing, virtually nothing.
Sounds like someone put the spectacle blind the wring side of the isolation valve to me...
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: 60 inch butterfly valve with a drain?
RE: 60 inch butterfly valve with a drain?
RE: 60 inch butterfly valve with a drain?
Presumably there would be two vent/drain locations on the valve body, which location to be used would depend on which orientation the valve is installed. The valve would have to be installed with the stem horizontal if you wanted to drain flare line liquids from the cavity created by the double disc configuration (obviously).
But this is all speculation.
[Edited to clarify]
RE: 60 inch butterfly valve with a drain?