Local PWHT between P-1 and P-4 materials
Local PWHT between P-1 and P-4 materials
(OP)
Dear all,
I have a revamp project by replacing a 54" nozzle in a vertical tower as shown in the attached sketch.
Does anyone have experience how the PWHT to be proceeded between P-1 and P-4 to prevent damage the carbon steel section which supposedly not to see temp greater than 1200F ?
I have a revamp project by replacing a 54" nozzle in a vertical tower as shown in the attached sketch.
Does anyone have experience how the PWHT to be proceeded between P-1 and P-4 to prevent damage the carbon steel section which supposedly not to see temp greater than 1200F ?





RE: Local PWHT between P-1 and P-4 materials
RE: Local PWHT between P-1 and P-4 materials
The local PWHT will be sub-out, I will check if they can perform temper bead. I also heard of reduced PWHT temp with prolonged duration. Where can I find the guideline ?
RE: Local PWHT between P-1 and P-4 materials
Table UCS-56.1 in Section VIII, Div 1.
Regarding maximum PWHT temperature for carbon steel, there is elevated temperature property data above 1200 deg F based on a percentage of YS and TS.
RE: Local PWHT between P-1 and P-4 materials
Be careful with transition between 1,25” shell thk SA 516-70 (138 MPa) and 2,5” insert plate SA-387 12 CL 2 (123 MPa), considering design temp. 200ºC
I prefer insert plate SA-516-70, round and not square plate. Nozzle 54” welded as per figure UW-16.1 (a). In this case PWHT is not required, only preheat to 120ºC.
Regards
r6155
RE: Local PWHT between P-1 and P-4 materials
RE: Local PWHT between P-1 and P-4 materials
What is your design metal temperature?, 1000ºF?
See ASME II Part D notes G10, S1 and T2 for SA-516 70, and S4 and T5 for SA-387 12 Class 2
Regards
R6155