KS 9-4:2018

Gas cylinders-Refillable welded low carbon steel cylinders for liquefied petroleum gas (LPG) exceeding 1.5 litre water capacity Part 4:Requalification and inspection.

Specifies the interval, inspection and testing procedures for requalification of refillable welded low carbon steel LPG cylinders of water capacity exceeding 1.5 L and up to including 150 L.