CSA G40.21 grade 260WT plates API standard 650 floating-roof tanks

Under the same sealing effect, the internal floating roof tank of API 650 oil storage tank can further reduce the evaporation loss compared with the API standard 650 floating-roof tanks External floating roof tank. This is due to the shielding of the fixed roof and the gas layer between the fixed roof and the internal floating plate, which has more significant heat insulation effect than the double disc floating roof of the API standard 650 floating-roof tanks external floating roof tank.

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

Low-pressure Storage Tanks for Liquefied Hydrocarbon Gases
API standard 650 floating-roof tanks Primary Components: In general, primary components include those components that may be stressed to a significant level, those whose failure would permit leakage of the liquid being stored, those exposed to a refrigerated temperature between –60°F and –270°F, and those that are subject to thermal shock. The primary components shall include, but will not be limited to, the following parts of a single-wall tank or of the inner tank in a double-wall tank: shell plates; bottom plates; roof plates; knuckle plates; compression rings; shell stiffeners; and manways and nozzles including reinforcement, shell anchors, pipe, tubing, forgings, and bolting.

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