ASTM A216 grade WCC external floating roofs API 650 special tank

To scientifically evaluate the remaining service life of the API 650 special tank, it is necessary to know the thickness change and development trend of the storage tank sheet after long-term use, combined with the metal characteristics of the storage tank, the influence of various external conditions and the continuous change of the oil pressure in the API 650 special tank, etc. factors to judge. Because the metal characteristics, corrosion defects, load and other numerical parameters of the API 650 special tank are randomly changed, the value of the remaining service life of the storage tank will also be dynamic.

The API 650 special tank outer wall shall be designed for the purging and operating pressure of the space between the inner and outer tank shells and for the loading from the insulation, the pressure of wind forces, and the roof loading.
The outer tank bottom, shell, and roof shall have a minimum nominal thickness of 3/16 in. (7.65 lbf/ft2) and shall conform to the material requirements of Q.2.3.

The vent pipe mouth should be 4m or more above the ground. The nominal diameter of the API 650 special 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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