EN 10025 S355J0 plates API Std 650 aboveground welded storage tanks

Production Weld Tests
Production weld test plates shall be welded for API Std 650 aboveground welded storage 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 Std 650 aboveground welded storage tanks blind flanges, gaskets, and bolting (for other types of blanking covers as may be required) necessary for testing.

Prefabrication requirements for API Std 650 aboveground welded storage tanks, large vertical storage tanks:
1. The machined surface of the edge of the steel plate should be smooth, and there should be no defects such as slag inclusion, delamination, cracks, etc., and the surface hardened layer produced by the flame cutting groove should be removed.
2. Dimension deviation after steel plate processing: the deviation of plate width is less than 1.5 mm, the deviation of plate length is less than 2 mm, and the difference between diagonals is less than 3 mm.