API 650 tanks hydrostatic testing requirements

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

Oil tank is often used to store crude oil, diesel oil, gasoline and other oil. The main structure of API 650 tanks is composed of tank top, tank wall, tank bottom and accessories. The API 650 tanks should be inspected after the completion of construction, and the detection methods of different structure positions are different. Tank wall inspection: for the newly built oil tank, water filling test shall be conducted to check whether the tank wall is tight, and the appearance inspection shall be conducted for the tank wall plate and weld. Tank wall thickness detection: the oil tank wall thickness is mainly detected by ultrasonic wave, with high efficiency.

Allowable Design Stresses
The maximum allowable design stresses for the API 650 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.

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