Re: [MW:32580] SA 516 GR 70- AVOIDANCE OF PWHT - 40 mm thickness

Normally the use of Nickel electrodes to avoid PWHT was practised in the SR(self reinforced) Nozzles where the vessel is not PWHTed and the Nozzle weld requires PWHT. Experts can throw some light on the C seam and any code restrictions.

Thanks & Regards

J.Gerald Jayakumar

On Friday, 29 October, 2021, 11:53:02 am GMT+4, Vishwas Keskar Welding Manager WELDING <vvkeskar123@gmail.com> wrote:

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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