LPG storage tank flaw detection

2.2 Wall thickness measurement The wall thickness of the key parts of the underground liquefied gas storage tank is measured. The measurement position is representative and there are enough measurement points. The measured minimum wall thickness is 16.5 mm. 2.3 Non-destructive testing 2.3.1 Magnetic particle flaw detection The magnetic particle flaw detection was carried out on the butt welds on the inner and outer surfaces of the liquefied gas storage tank and within 150 mm on both sides of the welds. A total of 8 surface cracks were found on the inner and outer surfaces.