A516 Gr 65 plates API 650 open-top tanks

The process parameters should be strictly controlled in sand blasting of API 650 open-top tanks. The working pressure of abrasive chamber is between 0.5 and 0.6a, and the outlet pressure of air compressor shall not be lower than 0.6 WPa. According to the test results, the distance between nozzle and workpiece shall be controlled at 80 - 200 mm and spraying angle of 30 ~ 75°is appropriate.

Production Weld Tests
Production weld test plates shall be welded for API 650 open-top tanks primary-component butt-welded shell plates when welding procedure qualifications are required to be impact tested per Q.6.2 and Q.6.3. The number of production weld tests shall be based on the requirements of Q.6.6.3 and Q.6.6.4. The locations impact tested (i.e., HAZ and/or weld deposits) shall likewise be the same as required for weld procedure qualifications per Q.6.2 and Q.6.3. Weld testing shall be in accordance with Q.6.6.5. Test plates shall be made from plates produced only from the heats that are used to produce the shell plates for the large welded steel tank.

Before pressure testing, thoroughly flush the API 650 tank floating roof primary drain hose system. Supply API 650 open-top tanks blind flanges, gaskets, and bolting (for other types of blanking covers as may be required) necessary for testing.

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