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internal pressure of 4 lbf/in.2 gauge material

internal pressure of 4 lbf/in.2 gauge material

internal pressure of 4 lbf/in.2 gauge material

Suggested Practice Regarding Installation of Low-pressure Storage Tanks
Access: All openings and accessories for tanks internal pressure of 4 lbf/in.2 gauge constructed according to this standard shall be installed so that any periodic inspections required can be readily made.
Corrosion: When a tank bottom rests directly on the ground, a survey shall be made to establish the need for cathodic protection.
Drainage: All tanks in which water might accumulate under the hydrocarbon contents shall be provided with adequate drains that are suitably protected from freezing.

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The API 650 is the American standard for welded flat-bottomed vertical internal pressure of 4 lbf/in.2 gauge storage tanks. This standard dictates tank design, manufacture, welding, inspection and installation requirements.

Treatment of internal pressure of 4 lbf/in.2 gauge 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.

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