3m diameter API Std 650 ambient temperature tanks
API 650 is the standard for welded tanks for oil storage. It specifies the API Std 650 ambient temperature tanks design, manufacturing, welding, inspection and installation requirements of oil tanks. API 650 is widely used in storage tanks with internal pressure less than or equal to 2.5 PSI.
Inspection of Welded Storage Tanks Surfaces Exposed during FabricationThe edges of API Std 650 ambient temperature tanks plates, openings and fittings exposed during fabrication shall be inspected carefully to make sure that any defects have been uncovered, as well as to determine that the work has been performed properly.Minor defects found may be repaired only after the inspector approves the method and extent of repairs. Materials that have more than minor defects that cannot be satisfactorily repaired shall be rejected.Spot radiographic or ultrasonic examination shall be not less than 6 in. extending along the weld. Spot radiography shall comply with the standards given in 7.15.1.3. Where spot radiographic or ultrasonic examination is applied at joint intersections, the surface shall be prepared and examined for a distance of 3 in. on each side of the intersection, making the minimum length of examination 6 in. on the horizontal weld and 3 in. on the vertical weld.
Usually, the soil resistance of the foundation should be considered before the design and construction of API Std 650 ambient temperature tanks. The soil endurance in the API Std 650 ambient temperature tanks construction area plays a decisive role in the basic cost of the tank. In areas with high soil resistance, not only the cost of foundation treatment can be greatly reduced, but also the ratio of height to diameter of storage tank can be obtained. Therefore, the investment cost of the API Std 650 ambient temperature tanks can be greatly saved in the area with large soil resistance.
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