Internal Grinding of avoid PWHT

[mechinspec]

I have came across situation where there is Client approved WPS to weld 60" X 19.05 mm thick CS Pipe & Fitting for sea water service wihtout PWHT.
But the Material received has thickness more then 20 mm some of them are upto 24 mm, as per ASME 31.3 Fig 328.4.3 (b) internal trimming is allowed to avoid misalignment.
My Question :- Is it allowed to internally grind the excess metal to the required thickness ie 19.05mm in order to avoid PWHT.

Appreciate your comments and sugesstions.
Thanks,
MechInspec

 

[metengr]

Is it allowed to internally grind the excess metal to the required thickness ie 19.05mm in order to avoid PWHT.

.

The question as phrased, No.

 

[Kiwi2671]

mechinspec,
Not sure which year B31.3 you are using but 2008 only requires PWHT for greater than 20 mm nominal wall thickness.
Key word here is nominal - definitions in 31.3 lists nominal as a designation - not an exact measurement.
So if you are supplied with 3/4" (19.05 mm) nominal wall thickness pipe and it happens to be actually 24 mm thick then IMHO it does not require PWHT (so grinding to correct misalignment is fine).
Bound to be an interpretation on this somewhere but cannot chase it up (sitting in an internet cafe in Northern Thailand)
Regards,
Kiwi