API 650 flat-bottom oil storage tanks filler metal
According to API standard 650, the stairs used for API 650 petroleum storage tanks or thermal insulation tanks should be double longitudinal beams supported by a minimum of ribs. If the gap between the API 650 flat-bottom oil storage tanks tank shell and the stringer of the API 650 petroleum storage tank exceeds 200mm, handrails should be provided on both sides of the stairs. Unless otherwise specified, according to API 650 flat-bottom oil storage tanks ASTM A123, the following accessories shall be hot-dip galvanized. The damaged zinc coating should be repaired with zinc alloy.
refrigerated tanks secondary components are those whose failure would not result in leakage of the liquid being stored. Secondary components also include those API 650 flat-bottom oil storage tanks components that are not in contact with the refrigerated liquid but are subject to the refrigerated temperature vapors and have a combined tensile and primary bending stress under design conditions that does not exceed 6000 lbf/in.2. Secondary components that could be designed within this reduced stress are roof plates, including roof manways and nozzles with their reinforcement, roof-supporting structural members, and shell stiffeners.
Requirements for prefabrication of bottom plate of large vertical API 650 flat-bottom oil storage tanks:1. The diameter of tank bottom should be enlarged by 0.1% ~ 0.15% according to the design diameter.2. The minimum dimension of edge plate along the radius direction of tank bottom shall not be less than 700mm.3. The distance between any adjacent welds of the base plate shall not be less than 300 mm.
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