Welding lap joint stub end ASME B31.3

[coolniks37]

I have a short section of piping that needs to connect two flanged valves.
Because of space constraints, I am planning to weld two stub ends together..
Is that allowed per ASME B31.3?

 

[LittleInch]

There is no restriction on fitting to fitting welding.

Clearly you need to install both rings before welding.
And make sure that you can insert bolts from the other side and don't clash with nuts and studs.

Why not two WN flanges?
Or Slip on?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[coolniks37]

Hi LittleInch,

Thanks a lot! Seems we are on the same page.
Reason for Lap Jt flanges, is that piping is Ti & no Ti flanges listed in B16.5.

 

[LittleInch]

Ah,

Never knew that.

This post also covers that so assume your stub joints are to ASME B 16.9?

https://www.eng-tips.com/viewthread.cfm?qid=345014

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[coolniks37]

Perfect! Appreciate your help! Thanks a lot, LittleInch.