ASTM A333 pipe API 650 unanchored flat-bottom tank

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

In this project a cylindrical tank 75 ft in diameter is designed for an internal pressure of 0.5 lbf/in.2 gauge in the vapor space. The plate material is ASTM A131 Grade B steel for thicknesses of 1/2 in. and less.
The top course of the butt-welded cylindrical sidewall is 1/4 in. thick. The tank API 650 unanchored flat-bottom tank roof is a conical shape with a 2:12 slope and a 1/4 in. thickness with single full-fillet welded lap joints. The maximum design liquid level is 6 in. below the plane of juncture of the roof and sidewall.