A662 Gr B plates API standard 650 low-alloy steel tanks

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

Impact Tests for High Alloys
Impact tests are not required for the high-alloy (austenitic stainless steel) API standard 650 low-alloy steel tanks base materials, nickel alloy based materials, aluminum base materials, and weld deposited for the nonferrous (aluminum) materials. Impact tests are not required for austenitic stainless steel welds deposited by all the welding processes for services of –200°F and above. Austenitic stainless steel welds deposited for service below –200°F by all welding processes shall be impact tested in accordance with Q.6.2 except that the required impact values shall be 75% of the values as given in Q.2.2.2, Item c.

The floating roof is the top cover floating on the liquid level, so the sealing performance of API standard 650 low-alloy steel tanks API 650 oil storage tank is very important. The floating plate mainly adopts elastic packing, and at the same time, it is compressed with the wall of API 650 oil storage tank with pressure strip around, and fixed with the floating plate with bolts. After the API standard 650 low-alloy steel tanks floating plate is lowered to a certain position of about 1.8m, a prop will support the floating plate to keep it in position.

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