API 650 cylindrical liquid-storage tank structural period of vibration

The establishment of a correct method for evaluating the life of API 650 cylindrical liquid-storage tank requires the preparation of criteria related to the strength and cracks of API 650 cylindrical liquid-storage tank, 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.

Impact Tests for High Alloys
Impact tests are not required for oil steel storage material nickel alloy welds made with electrodes/filler metals covered by AWS Specification A5.11 or AWS Specification A5.14, provided the nominal nickel content is 50% or greater, and the weld is deposited by the shielded metal-arc welding (SMAW), gas metal-arc welding (GMAW), gas tungsten-arc welding (GTAW), or plasma-arc welding (PAW) processes. When A5.11/A5.14 specifies the nickel content as a “remainder,” the nickel content shall be determined by summing the maximum specified values of the other elements (use the average specified value for elements with specified ranges) and subtracting from 100%.

The vent pipe mouth should be 4m or more above the ground. The nominal diameter of the API 650 cylindrical liquid-storage tank API 650 petroleum storage tank vent pipe should be no less than 50mm and a flame arrestor should be installed.

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