Weld Neck Flange Welded to Weldolet
Weld Neck Flange Welded to Weldolet
(OP)
Hi guys,
I wanted to connect a 2" ball valve to a volume tank. In order to connect to the ball valve, I would need to put a weldolet on the volume tank.
My question is can I weld directly the weldolet to the valve or I have to weld a piece of pipe first and then weld this pipe to the ball valve?
Your answers will be appreciated
Thanks and Regards
Robin Araujo





RE: Weld Neck Flange Welded to Weldolet
You can weld anything onto a weldolet so if you have a weld end valve then yes you can do this or directly weld a weldneck flange. There is also a product called a "weldoflange" which is a single forged flange and weldolet as one item which reduces one weld.
Of more concern though is that you're talking about welding a weldolet onto some sort of tank - I don't know what you mean by "volume tank" - it's not a term familiar to me. Normally this is called a nozzle and needs to be designed such that the additional loads on the tank are acceptable, i.e. weight of the valve and piping, other forces etc and this usually requires some sort of compensation plate on the tank to reduce stress loads. I haven't seen a weldolet put on a "tank" before, only piping or a pressure vessel, where other design codes apply such as ASME VIII or PD 5500. ditto tanks have their own design codes which you need to follow if you're going to modify an existing unit. If you're not careful you could rip a hole in the tank once you bolt everything togehter and fill it with liquid....
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Weld Neck Flange Welded to Weldolet
Also, consider future replacement of the welded valve. Cutting, welding may involve decontamination and/or purging. Might want to use a flanged valve?
donf
RE: Weld Neck Flange Welded to Weldolet
Talking 'bout olets, vesselets are olets designed for vessels, arent they?
RE: Weld Neck Flange Welded to Weldolet
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way