API Std 650 aboveground steel oil storage tanks external pressure
API 650 is the standard for welded tanks for oil storage. It specifies the design, manufacturing, welding, inspection and installation requirements of oil tanks. API 650 API Std 650 aboveground steel oil storage tanks is widely used in storage tanks with internal pressure less than or equal to 2.5 PSI, used to store products such as crude oil, gasoline, chemicals, and produced water. BBN has extensive experience in API Std 650 aboveground steel oil storage tanks API 650 tanks with diameters between 8'-300', suitable for refineries, terminals, pipeline facilities and other customers.
The tank 20-in. inside-diameter nozzle shown in Figure F-6 is located in solid plate in the sidewall of a cylindrical storage tank 148 ft in diameter in an area where the thickness of the wall plate, tw, is 11/2 in. A corrosion allowance of 0.10 in. is required on all surfaces of the tank exposed to the stored liquid. The total internal pressure, Pl + Pg, at the center of the opening is 24.9 lbf/in.2 gauge. The thickness of the API Std 650 aboveground steel oil storage tanks wall plate, t, required by 5.10.3 for the latitudinal unit forces, T2, acting at this level is 1.44 in.
The water dissolved in the oil will be separated out from the oil stored in the API Std 650 aboveground steel oil storage tanks for a long time, and the acidic water layer will appear at the bottom of the API Std 650 aboveground steel oil storage tanks for a long time, which will accelerate the corrosion of the API Std 650 aboveground steel oil storage tanks and cause the wall thinning and even leakage. With the increase of service life, the API Std 650 aboveground steel oil storage tanks must be inspected and cleaned regularly to check the hidden danger.
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