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[MW:32577] SA 516 GR 70- AVOIDANCE OF PWHT - 40 mm thickness

By Materials & Welding
The vessel details are 
MOC - SA 516 GR 70 
DIAMETER- 4020mm
LENGTH - 37 MTR
MDMT = - 50 Deg C to  + 250 Deg C 
SERVICE - Non lethal /No Hydrogen Service 

We are proposing Vessel length build up as per FURNACE LENGTH CAPACITY(24 m maximum) and one joint WITHOUT PWHT  ( JOINING PWHTed sections earlier at site )
Proposal - 
1.MOC - SA 516 GR 70 
2.BUTTERING - ENiCrFe2 on 24 m section end and other at 13 m section end)
3,PWHT (section PWHT - One of 24  length and other 13 m)
 of  - 620 Deg C - 125 MINUTES 
4.Bevel preparation 
5.NDT - DPT 
Welding at site ( 24 m section with 13 m section) - ENiCrFe2 OR E309 
6.NDT - DPT AND UT

Expert opinion please  and share experience if any 

Vishwas 

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