API Std 650 cylindrical welded storage tanks workmanship

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

In this project, the area of tank wall used is of the same construction, material, and geometry as that described in F.1.3.1 except that the thickness of the plate is 3/8 in. The wall is stressed in the same manner as is described in F.1.3.1. A corrosion allowance of 1/16 in. is required. The computed (meridional) tensile stress, stc, in the net thickness after deduction of the corrosion allowance is 8000 lbf/in.2.
The problem in this example is to find the maximum allowable (latitudinal) compressive stress value for the given conditions, in conformance with the provisions of API 620 tank standard 5.5.4.5.
Solution: As determined from Table 5-1, the maximum allowable tensile stress value, Sts, for ASTM A285, Grade C, steel plate in simple tension is 16,500 lbf/in.2. Since the compressive stress is latitudinal, the governing value of R in this situation is R1, or 75 in.

Oil, Gas, Chemical, Water, and Bio-Fuel storage. Maximum of the most common welded steel tanks used in industry are designed following API 650. Tanks typically found in Refinery API Std 650 cylindrical welded storage tanks tank farms, Terminals, Pipelines, and other process facilities use these tanks.

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Hot rolled plates are known for their superior mechanical properties over commodity grades of merchant bar. The hot rolled API Std 650 cylindrical welded storage tanks plates products are made to specific chemistry and mechanical properties ranges, allowing them to be used in engineered applications. Resulting shafts, axles, and gears can be used in the automotive API Std 650 cylindrical welded storage tanks industry and agriculture equipment. A36 mild steel has good strength, formability, and excellent welding properties. We also can supply welding, fabricating, and bending service.