I do not think the +/- 25 F tolerance is stated in D1.1, but I believe the 25 F tolerance
has something to do with furnace calibration. The calibration sticker on the furnace that
we use shows the specific temperatures tested (ex. 1000, 1050, 1100, 1125, 1500, 1175),
and then it also shows +/- 25 F for the temperatures listed.
When our WPSs require PWHT we state in the PWHT section +/- 25 F next to the
temperature (assuming this is common). If the wrong program was punch in or the furnace
was acting squirrelly, then I can see were the +/- tolerance would help out. As long as
the temper temperature was not exceeded as you stated, then I do not see the harm in
utilizing the tolerance. Don't get me wrong though, I understand that the PQR was tested
at a specific temperature, and a major increase or decrease would change the mechanicals,
but I don't see what +/- 25 F would hurt. Any other input on this would be greatly appreciated.
Thanks GRoberts, you always reassure me that I'm on the right path.