Pipe Class change for a flanged valve
Pipe Class change for a flanged valve
(OP)
The question has come up as to whether both flanges of a thru-bolted butterfly valve that also has a class change from B31.1 to ASME Section III should be ordered as ASME SA material or if the B31.1 side flange can be ordered as ASTM A material. I have attached a pic of the valve from the P&ID.
Would the answer change if the valve was not thru-bolted and each flange was secured with its own bolt set?
Part of the issue seems to be the hydrotest requirement differences between B31.1 and Section III.
thanks
Mark
Would the answer change if the valve was not thru-bolted and each flange was secured with its own bolt set?
Part of the issue seems to be the hydrotest requirement differences between B31.1 and Section III.
thanks
Mark





RE: Pipe Class change for a flanged valve
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pipe Class change for a flanged valve
and, what about non thru-bolted, would one side have ASTM material flange and bolting and the other have ASME material for the flange and bolting?
RE: Pipe Class change for a flanged valve
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pipe Class change for a flanged valve
If safety related, I would want the entire valve in compliance.
"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek
RE: Pipe Class change for a flanged valve