PWHT Requirements for o-lets 1

[cheifchick]

Good Morning All,

Code: B31.8

Am welding 1.500" wt piping. Per code and welding procedures, PWHT is required and is being performed. However, our project engineer is challenging the practice of PWHT 1500# "o-let" connections.

My stand, we are making our tap connections by cutting with oxycetele torch (burning), which does in fact subject the entire base metal to heat. The proper fit of the WOL to the pipe constitutes a full penetration weld (root bead). The weld metal it self, measures 1.225".

Am I proceeding correctly, or am I wasting time and money? Thoughts or code references would be greatly appreciated.

 

[metengr]

PWHT is required for the stated conditions above. See

825.2
Welds in all carbon steels shall be stress relieved when
the nominal wall thickness exceeds 11?4 in.

825.3
When the welded joint connects parts that are of different
thicknesses but of similar materials, the thickness
to be used in applying the rules in paras. 825.1 and 825.2
shall be
(a) the thicker of the two parts being joined, measured
at the weld joint
(b) the thickness of the pipe run or header in case
of branch connections, slip-on flanges, or socket weld
fittings

 

[cheifchick]

Thank you so much!

Your help is GREATLY appreciated.