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[MW:12548] defect on circ-seam of H2 service vessel

By Materials & Welding

Dear Mr. Pradeep Goswami & other experts...

 

We have a newly fabricated Vessel having following details

 

 

Vessel:  1200 mm ID X 4550 mm TL-TL

MOC: SA 516 Gr 60

Code of constr: ASME section VIII div 1 2007 edn.

Thickness: shell-20mm; DE-24 mm

Design pr- 32.3 kg/sq.cm; Design temp - 80 deg.C

Service: LPG+Naphtha ; Vessel is designed for  Hydrogen service, 100%RT, Fully PWHT; hydrotested ,cleared by TPI, erected at site, yet to be commissioned

 

 

Imperfection (a notch or gouge out)of about 3-4 mm deep and 15 mm long observed on weld seam CS-1 (Top Dished end to shell circ. seam joint ) from inside of vessel. Please see the attached image of segment radiographed by us.

 

My queries...

 

What rectification shall I do on the defective segment on the service point of view?

What are the NDE's required?

Is a local PWHT mandatory at the repaired segment?

Any special precautions for H2 service...

 

appreciate your quick feedbacks..

 

Regards

Hrishi

 

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