API standard 650 partially anchored liquid-storage tanks design metal temperature

This API 650 tank standard is designed to provide industry with tanks of adequate safety and reasonable economy for use in the API standard 650 partially anchored liquid-storage tanks storage of petroleum, petroleum products. and other liquid products.

Allowable Design Stresses
The maximum allowable design stresses for the API standard 650 partially anchored liquid-storage tanks materials outlined in Q.2.1 shall be in accordance with Table Q-3.The values for the allowable design tensile stress given in Table Q-3 for materials other than bolting steel are the lesser of (a) 331/3% of the specified minimum ultimate tensile strength for the material or (b) 662/3% of the specified minimum yield strength, but they are 75% of the specified minimum yield strength for the stainless steel, nickel alloy, and aluminum materials. Allowable test stresses are based on the limitation of API 620 oil tank storage standard Q.8.1.3.

Generally, external environment corrosion should be considered before design and construction of API standard 650 partially anchored liquid-storage tanks and so on storage tanks. The corrosion on the outer surface of storage tank is often worse than that on the inner surface. Especially in the chemical industry area, there are often acid fog, alkali or salt dust in the atmosphere. These impurities form an active corrosive medium with dew or steam and oxygen in the atmosphere. The corrosion of the external environment of the storage tank shortens the maintenance period of the storage tank, even causes the storage tank to be scrapped in advance, which affects the normal operation of the storage and transportation.

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