ASME 31.3 - WeldOlet to Blind Flange
ASME 31.3 - WeldOlet to Blind Flange
(OP)
Per ASME B31.3, is welding a 2" Weldolet to a 20" blind flange code compliant? If so, what code discusses this situation. Similar situation is welding a 3" Weldolet to an 8" Blind flange.





RE: ASME 31.3 - WeldOlet to Blind Flange
Note all holes should be in the centreof your blind flange. Any off centre or multiple holes really need this to be considered using ASME VIII.
I would always question what exactly you are connecting this weldolet to. The bigger and heavier it is the more susceptible your small connection is to mechanical damage, fatigue, over stress (e.g.a 2" #1500 valve) without further support.
Take care with these types of connections and use proper components whenever possible.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: ASME 31.3 - WeldOlet to Blind Flange
RE: ASME 31.3 - WeldOlet to Blind Flange
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: ASME 31.3 - WeldOlet to Blind Flange
This is what we did for one of our projects:
Weldolet required were flat. We had to weld it to blind flange. Received had curvature to match the OD of some pipe. We asked the manufacturer, if we machine the weldolets to remove only the curved portion (matching the radial portion of pipe), will it be compromising strength. Their reply in writing was that there would not be any difference as the smallest part (to fit the axial pipe direction) is the weakest portion to bear the pressure. So machining up to this point will not affect strength.