IMPROVEMENT OF THE QUALITY OF WELDED ASSEMBLY FOR BRANCHPIPE CUTTING INTO THE WALL OF OIL STORAGE TANK

摘要

Performance of the assembly for cutting branchpipes for process pipelines and hatches in lower rings of the wall of high-capacity oil storage tanks is considered. It is shown that one-sided grooving of holes for the branchpipes followed by circumferential welding on the inside of tank wall, specified by industry standards, cannot guarantee the required complete penetration. It is suggested that the two-sided non-symmetrical edge preparation should be made, providing substantial improvement of welding conditions and quality of the circumferential welds.