lganga
Mechanical
- Apr 10, 2011
- 109
Because of a CUI problem, we have to replace a 300 mm width, along 180°C and 18 mm thickness SA 285C plate.
The process column works in two different temperatures ( from bottom to half of it is designed at 100°C, out of 285 C plate and the upper part at -25°C with A 516 Gr70 normalized plate).
It is a letal service column, with PWHT.
Vessel is 35000 mm high and 1500mm diameter .
The patch is at 17000mm elevation from bottom,material is 516 GR70 butt welded to the 285C original plate and 18 mm thickness.
Questions:
1) is there any welding porcedure that prevents the PWHT?
2) In case of PWHT , can it be done partially in two 90° parts? (of course with reinforced steel forms or plates for bearing and inertial reinforcement).
Regards
LCa
The process column works in two different temperatures ( from bottom to half of it is designed at 100°C, out of 285 C plate and the upper part at -25°C with A 516 Gr70 normalized plate).
It is a letal service column, with PWHT.
Vessel is 35000 mm high and 1500mm diameter .
The patch is at 17000mm elevation from bottom,material is 516 GR70 butt welded to the 285C original plate and 18 mm thickness.
Questions:
1) is there any welding porcedure that prevents the PWHT?
2) In case of PWHT , can it be done partially in two 90° parts? (of course with reinforced steel forms or plates for bearing and inertial reinforcement).
Regards
LCa
