API standard 650 closed top welded storage tanks secondary seal
These API 650 documents will define the bases of design, operation, inspection, tests, examinations, and maintenance of an API standard 650 closed top welded storage tanks industrial facility. Bidders will study and analyze all this API 650 documentation, both during the preparation of the quotation and during the execution of each project activity.
The water dissolved in the oil will be separated out from the oil stored in the API standard 650 closed top welded storage tanks for a long time, and the acidic water layer will appear at the bottom of the API standard 650 closed top welded storage tanks for a long time, which will accelerate the corrosion of the API standard 650 closed top welded storage tanks and cause the wall thinning and even leakage. With the increase of service life, the API standard 650 closed top welded storage tanks must be inspected and cleaned regularly to check the hidden danger.
API standard 650 closed top welded storage tanks Visual InspectionUpon completion of all the foregoing tests, the pressure in the tank shall be released and a thorough visual inspection shall be made of both the inside and outside of the tank, giving particular attention to all internal ties, braces, trusses, and their attachments to the walls of the tank. Anchors shall be checked for snug tightness and adjusted if required. Anchor threads shall be fouled by peening or tack welding to prevent loosening. In lieu of thread fouling, double nuts may be used.Rate of Water Filling and Water TemperatureThe rate at which water is introduced into a tank for a hydrostatic test shall not exceed 3 ft of depth per hour. The foundation, venting equipment, or other conditions may limit the water filling to a lower rate. Pressure shall not be applied above the surface of the water before the tank and its contents are at about the same temperature.
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