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

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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