API standard 650 self-anchored flat-bottom tanks structural shapes

The company has a group of experienced steel plate continuous processing line construction, production management, operation and professional and technical personnel. The company is a modern enterprise integrating scientific research and development, production processing, sales and service. Our main products include hot rolled plates, seamless pipes, API standard 650 self-anchored flat-bottom tanks and steel structures. At the same time, it also adheres to international standards and adheres to the international line.

Tank cracks are common API standard 650 self-anchored flat-bottom 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 standard 650 self-anchored flat-bottom tanks construction, which become obvious after the later use. Or in the process of using the API standard 650 self-anchored flat-bottom tanks, the tank body material generated new defects due to corrosion, pressure, wear and other reasons, and tank cracks.

Test plates shall be welded using the same qualified welding procedure and electrodes that are required for the tank shell plate joints. The API 620 steel storage tank test plates need not be welded as an extension of the tank shell joint but shall be welded in the required qualifying positions. One test weld shall be made on a set of plates from each specification and grade of API standard 650 self-anchored flat-bottom tanks plate material, using a thickness that would qualify for all thicknesses in the shell. Each test welded of thickness t shall qualify for plate thicknesses from 2t down to t/2, but not less than 5/8 in. For plate thicknesses less than 5/8 in., a test weld shall be made for the thinnest shell plate to be welded; this test weld will qualify plate thicknesses from t up to 2t.