Weldolet direct onto weld neck flange

[Spoonful]

Hi All,

Here I have got an question,

For a small nozzle say 25NB, on a vessel, the normal layout is weldolet welded onto the vessel and a pipe is welded onto the weldolet and then a WN flange is welded onto the pipe.

The question is can the WN flange welded direct onto the weldolet? if ignore the potential problem of tight room for the fasteners?

Thanks

 

[europipe]

It's okay.
There is room enough for the fasteners.
Draw it.

 

[DSB123]

You can actually get a forged fitting called a Weldoflange which is a combined weldolet and flange rather than having to weld the two fittings together.

 

[europipe]

DSB, a little costly?

 

[DSB123]

europipe,
Two fittings vs one also one less butt weld plus the radiography etc. Think you need to do the total sums again on cost!!!!

 

[Spoonful]

what I am try to find out is, is there any code have any statement that preventing weld weldolet direct to flanges. I cant see why not. I want to have a some sort of proof that we can do it this way.


WN flange and Weldolet can be both off shelf items, I guess a weldoflange is not that widely available, so might have to be custom made, plus if all other welded will be x rayed, so it might not be that much extra cost to do x ray on this extra weld. There might be some case where taken other factor into consideration that make weldoflange more beneficial than two pieced welded.

 

[DSB123]

Weldoflanges are off the shelf items/components. There are no restrictions to welding a weld neck flange to a weldolet.