API 650 welded steel storage tanks formulas
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 welded steel 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 welded steel storage tanks ASTM A123, the following accessories shall be hot-dip galvanized. The damaged zinc coating should be repaired with zinc alloy.
Materials for API 650 welded steel storage tanks primary components shall comply with the requirements of Tables R-1 and R-2. All primary components shall be impact tested in accordance with R.2.1.2 through R.2.1.4. Impact testing of API 620 welded storage tanks plates, including structural members made of plate, shall comply with Table R-1. Impact test specimens shall be taken transverse to the direction of final plate rolling.
Requirements for prefabrication of bottom plate of large vertical API 650 welded steel 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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