API standard 650 aboveground welded storage tanks data sheet
Generally speaking, the duration of the "exhalation" of the API standard 650 aboveground welded storage tanks is longer than that of the "inhalation" of the API standard 650 aboveground welded storage tanks every day. There are many factors affecting the "small breathing" loss, mainly including the following points: the change of temperature difference between day and night, sunshine time of the API standard 650 aboveground welded storage tanks location, open area of the API standard 650 aboveground welded storage tanks, atmospheric pressure, filling degree of API standard 650 aboveground welded storage tanks, etc. When the API standard 650 aboveground welded storage tanks is full of gas, the space volume is small, and the "small breathing" loss is less; if the space volume is large, the loss is also large.
Inspection of Welded Storage Tanks Surfaces Exposed during FabricationThe edges of API standard 650 aboveground welded storage 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.
Upon completion of API standard 650 aboveground welded storage tanks construction, provide Purchase with a Vendor's Certification that the tank conforms to the requirements of API 650 and to the additional requirements as specified.
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