Mechanical loading on API Std 650 anchored liquid-storage tanks

The effect of air pressure on the API Std 650 anchored liquid-storage tanks tank walls of the API 650 tank must be considered when the design pressure is greater than 2 kPa.The fixed point method can be used to design the tank wall of atmospheric or micro internal pressure API Std 650 anchored liquid-storage tanks storage tank.

The establishment of a correct method for evaluating the life of API Std 650 anchored liquid-storage tanks requires the preparation of criteria related to the strength and cracks of API Std 650 anchored liquid-storage tanks, mechanical damage mechanisms, corrosion mechanisms, and mathematical models of fatigue crack growth, etc., which are compiled into computer programs. In the process of programming the program, it is required to select the operating parameters, plates, reinforcement accessories, metal properties, corrosion levels, mechanical damage defects and other data of the oil storage tank under various conditions.

The API 650 oil tank stiffener ring and backing strip, if used, are primary components, and they shall comply with the requirements of R.2.1. The API Std 650 anchored liquid-storage tanks stiffener ring may be fabricated from plate using an intermittent weld on alternating sides between the web and the flange. One rat hole with a minimum radius of 3/4 in. shall be provided at each longitudinal shell joint and ring juncture weld.

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