ISO 630 grade E275 quality D plates API Std 650 ground-supported liquid storage tanks

Welding certification is regulated by Section 10 of the American Society of Mechanical Engineers (ASME). For both API Std 650 ground-supported liquid storage tanks storage tank API 650, non-destructive inspection is required, but third-party inspection is not required.

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Treatment of API Std 650 ground-supported liquid storage tanks welding defects:
1. Lack of fusion: once found, it should be shoveled and grinded off before re welding.
2. Incomplete penetration: over standard defects shall be removed and re welded. When welding on both sides, the shallow side of the groove can be grinded and shoveled to expose the welding root on one side, and then the welding is repaired.
3. Slag inclusion: over standard defects shall be removed and re welded.
4. Crater: weld to full after grinding.
5. Air hole: if the internal air hole exceeds the standard, it shall be welded again after being removed by grinding shovel, and the surface air hole shall be removed by grinding wheel and then repaired.