API 650 aboveground welded storage tanks shell plates
The preparatory work before the construction of the API 650 aboveground welded storage tanks is directly related to the quality assurance, project progress, construction safety and other aspects of the entire oil tank project. Therefore, the preparation work before the API 650 aboveground welded storage tanks construction should be paid attention to and planned. Before API 650 aboveground welded storage tanks construction, you need to prepare conventional machinery, materials, and facilities, as well as the quality control of the project, such as the installation method of the API 650 aboveground welded storage tanks, the welding method of the steel plate, and the inspection of the tank material. In addition, there is the most important item, construction safety protection.
The API 650 aboveground welded storage tanks stiffener ring and backing strip (if used) are primary components, and they shall comply with the requirements of API 620 storage steel tank Q.2.1. The stiffener rings may be fabricated from plate using an intermittent weld on alternating sides between the web and the flange.Except for aluminum or stainless steel tanks, all fillet welds shall consist of a minimum of two passes. The ends of the fillet welds shall be 2 in. from the rat hole (see Figure Q-1), and these welds shall be deposited by starting 2 in. from the rat hole and welding away from the rat hole. An acceptable alternative to the detail that includes stopping fillet welds 2 in. short of the rat hole would be to weld continuously through the rat hole from one side of the stiffener to the opposite side. All craters in fillet welds shall be repaired by back welding.
API 650 storage tank, double-layer oil tank environmental protection advantages: ordinary single-layer steel API 650 aboveground welded storage tanks oil tank is corroded by underground water and gas and electrolytic corrosion because it is buried underground all year round. The API 650 tank has a double-layer structure with a gap of 0.1 mm. The API 650 aboveground welded storage tanks outer layer of FRP ensures that the leakage will not directly leak into the soil and water source.
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