Procedure

1. After replacing the new shells checked the root gap of 3.00mm base metal preheating and backing of electrodes followed as standards.
2. Outside shell using of Lotherme 352 dia 3.15mm for root run by diagonally sitting stich welding ,after completing the root welding followed the DPT . and continued lot 352 dia 4mm.
3.Inside the shell for removing penetrated root layer made back gouging then DPT and one layer of lot 352 and final layer with lot 510N to protect thermal shocks.
4. After completing the welding made the UT and found satisafactory.