The final finish of the weld shall be such that the
change of section from drum to standpipe, or from flange
to standpipe is gradual and free from sharp notches.
After completion of welding (except in the case of seal
welds) the drum shall be stress-relieved by heat treatment.
branch must be a loose fit in the hole but the gap at any point, should not
exceed 3 mm or en/2 whichever is less.
Weld sizes B1 + F1 = 1.52n
F1 should not exceed 16 mm not be less than 2n/2.
Weld size B + F = 1.5 en minimum or
1.5 es minimum, whichever
F should not exceed 16 mm nor be less than en/2.
en = thickness of
es = thickness of shells.".