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[MW:20834] Re: Slug catcher weld repairing

By Materials & Welding
hi tavakoli

1-for the wires they are correct

2-try the preheat to be 150c and also to control uniform distribution to the preheat temp. (like using PWHT machine heaters)


3-try to control the heat input to be within range of PQR

this to avoid cracks but the lof is normally related to the fit up and welder skill

 

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On Wednesday, 14 May 2014 13:11:33 UTC+2, tavakoli...@gmail.com wrote:
we have sludge catcher finger type in Sirri Island of IRAN, material is API 5L X65 & gas H2S is 25000 ppm 
After 4 years bad operation, field weld of all fingers has been damaged and all fingere filled by sludge! all field weld have leakage and should be repaired.
We prepare a test piece with filler 80 S Ni1 and electrode 8018G but after radiography and  related test, some of welds have crack and LOF! preheat was 100 C and hydrogen remove has be done (250 C)
Now which Filler wire & electrodes are suitable for repairing?
which instruction is proper?
Please advice me for this matter...

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