API 650 insulated tanks limitations
API 650 internal floating roof tanks are generally called internal floating roof tanks, floating roof tanks, internal floating disk storage tanks, internal floating disk tanks, etc., specifically referring to API 650 storage tanks and oil tanks with aluminum, stainless steel, etc. The API 650 insulated tanks inner floating roof of series material is an environmentally friendly and economical storage tank that prevents liquid from volatilizing.
The pressed-steel, round manhole with a 20-in. inside diameter shown in Figure F-8 is located in API 620 crude oil tank solid plate in spherical portion of a torispherical roof on a cylindrical storage tank 72 ft in diameter. The internal pressure, Pg, on the underside of the roof is 15 lbf/in.2 gauge. The thickness, t, of the roof plate required by 5.10.3 for the spherical portion of the roof is 1/2 in., which is exactly the thickness provided. No corrosion allowance is required. The materials in the oil tank roof plates and manhole frame conform to ASTM A283 Grade C steel; the main joints in the roof are double-welded butt joints, spot radiographed in accordance with 7.16 and 7.17.
Proper use of API 650 insulated tanks and precautions:1. The API 650 insulated tanks must be used within the safe height range;2. Check before use to ensure that the safety valve and breathing valve are flexible and easy to use;3. The explosion-proof and fire-proof safety measures for oil tanks are implemented effectively;4. The oil level in the API 650 insulated tanks should be accurately measured when receiving and delivering oil, so as to prevent overflow or empty;5. In the process of receiving and sending oil, the flow rate of oil should be controlled, and it should not be too fast to avoid electrostatic accidents.
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