fillet weld size for slip on flanges B31.1
fillet weld size for slip on flanges B31.1
(OP)
looking at details acceptable fillet weld size detail indicates X mim = 1.4 Tn ; tn is defined as nominal pipe wall thickness , is TN the required design wall t or the actual pipe wall t





RE: fillet weld size for slip on flanges B31.1
This link is from ASME B31.3 but the pipe and the flange are the same for both B31.1 and B31.3
http://www.google.com/url?sa=t&rct=j&q=&am...
Sometimes its possible to do all the right things and still get bad results
RE: fillet weld size for slip on flanges B31.1
pennpiper, this is for the outside fillet.
Regards,
Mike
RE: fillet weld size for slip on flanges B31.1
And back to the original question; Any SO flange welds that are at least 1.4 x nominal pipe wall are acceptable; IF the pipe can be proved to be thinner than Nominal [12½% below nominal is allowed on the SA-53 and SA-106 pipe spec's] a weld that is 1.4 x Actual Wall is acceptable.
In no case is 1.4 x Actual Wall thickness required for pipe that is actually thicker than nominal. The reason is simple; that extra pipe thickness was not used for figuring the MAWP of that pipe system. ASME design rules use Nominal Wall.