The part that really caught our attention with this is that along with a U1A we have a copy of the in-house Quality Control checklist. The AI did sign off on the U1A, but there was never an initial on the checklist for the Post-Weld Heat Treatment. This may simply be attributed to the AI not...
The 4 reactors operate as follows:
Hydrotreater - 480 deg F at ~240 psig and is 5'D x .750" thick
Desulferizer A - 515 deg F at ~240 psig and is 5'6"D x .750" thick
Desulferizer B - 558 deg F at ~240 psig and is 5'6"D x .750" thick
High Temp. Shift Converter - 631 deg F and is 5'6"D x .750"...
We very well could be chasing a non-issue. We are not trying to run out screaming 'The sky is falling', but there is talks of some changes in operating condition. We are just trying to cover all basis when the ball gets placed in our court. We are trying to come up with a basis to plan the...
We have factored the reduced temp and increase time factor. Unfortunately, our records do not include the duration of time at temperature. I am hesitant on making assumptions in this, but your point has been considered.
While reviewing some records at work on some reactors in our Hydrogen unit that they may not have been Stress Relieved to the proper temperature.
The material is SA-387 Gr.11 Class 2 (1-1/4% Cr) which is a P-4 Material. Our records indicate that the vessels were stress relieved at 1100 deg F...
