We will perform the following visual inspections on oxygen cylinders！
1: Visually inspect the oxygen cylinders one by one to check whether there are dents, pits, bumps, damage, cracks, interlayer, corrosion or burns on the surface.
2: When there is a depression in the cylinder, the maximum depression depth should be measured. The ruler should be placed along the axis of the aluminum bottle, and the curved template should be placed along the circumference. When measuring with a ruler. The length of the ruler should be greater than five times the maximum diameter of the recess; when measuring with an arc-shaped sample, the arc length of the sample should be greater than 1/3 of the circumference of the aluminum bottle. The maximum depth of the recess exceeds 1.5mm and exceeds 1.0% or more of the nominal diameter of the aluminum bottle. The diameter of the recess is 1/40 and should be scrapped.
3: When the cylinder has bulges, if the circumference of the cylinder increases by 1.0%, it should be scrapped
4: When there is damage, pits or linear corrosion on the outer wall, the edges of the defect should be ground to make a smooth transition with the surrounding wall, and then use a ruler and a micrometer to measure the depth of the damage, pits or corrosion. If the remaining wall thickness at the defect is less than 90% of the design wall thickness, it shall be rejected. Defects that have not reached the scrap conditions should be ground to make the edges smooth transition, but the remaining wall thickness after grinding shall not be less than 90% of the design wall thickness.
5: There are visible cracks or delaminations on the bottle body, which should be scrapped
6: Aluminum bottles with arc scars, welding marks or open flame grilling on the bottle body that damage the metal should be scrapped.
7: When the bottle body has pitting corrosion defects, the corrosion depth should be measured, and the remaining wall thickness is less than 80% of the design wall thickness and should be rejected.
8: When the bottle body has pitting corrosion defects, the corrosion depth should be measured, and the remaining wall thickness is less than 90% of the design wall thickness and should be rejected.