13.5m diameter API Std 650 unanchored tanks

Tank cracks are common API Std 650 unanchored tanks defects, mainly including tank wall cracks, internal cracks, weld zone cracks. The reason for these defects may be that the defects not exceeding the standard existed in the early stage of API Std 650 unanchored tanks construction, which become obvious after the later use. Or in the process of using the API Std 650 unanchored tanks, the tank body material generated new defects due to corrosion, pressure, wear and other reasons, and tank cracks.

Production Weld Tests
Production weld test plates shall be welded for API Std 650 unanchored 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.

Upon completion of API Std 650 unanchored tanks construction, provide Purchase with a Vendor's Certification that the tank conforms to the requirements of API 650 and to the additional requirements as specified.

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