EN S275J2 plates API 650 anchored tanks

API 650 storage tank, double-layer oil tank environmental protection advantages: ordinary single-layer steel API 650 anchored tanks oil tank is corroded by underground water and gas and electrolytic corrosion because it is buried underground all year round. The API 650 tank has a double-layer structure with a gap of 0.1 mm. The API 650 anchored tanks outer layer of FRP ensures that the leakage will not directly leak into the soil and water source.

When the day light gradually decreases, the temperature of oil in the API 650 anchored tanks will also decrease, the evaporation speed will gradually slow down, and the pressure in the API 650 anchored tanks will also decrease. When the pressure in the API 650 anchored tanks is lower than the negative pressure rating of the breathing valve, the outside air is sucked into the API 650 anchored tanks through the open vacuum valve, which is the "suction" process of the oil tank.

Investigation of Subgrade
On actual steel storage tank sites to be used, test borings or test pits, or both, may be made at the direction of a competent engineer who will specify the number and location. They need not be equally spaced but should be laid out to uncover possible weak spots.
In general, test loadings of subgrade at the bottom of test pits need be resorted to only when such heavy loading as may be imposed by footings for major column supports for spheres or similarly elevated API 620 low-pressure tanks is specified. Results may be deceptive if average load-bearing capacity over a considerable area is wanted. All field data shall be recorded with maps, and copies shall be supplied to all engineers concerned with design, erection, and later operation.

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