ASTM A131 structural shapes API Std 650 storage tanks
API 650 tank has the advantages of less load on the floating plate, simple and light structure, and can save the central drainage pipe and rotating floating ladder on the API Std 650 storage tanks floating plate. The materials for easy construction and maintenance and sealing parts can avoid aging due to sunlight.
Generally speaking, the duration of the "exhalation" of the API Std 650 storage tanks is longer than that of the "inhalation" of the API Std 650 storage tanks every day. There are many factors affecting the "small breathing" loss, mainly including the following points: the change of temperature difference between day and night, sunshine time of the API Std 650 storage tanks location, open area of the API Std 650 storage tanks, atmospheric pressure, filling degree of API Std 650 storage tanks, etc. When the API Std 650 storage tanks is full of gas, the space volume is small, and the "small breathing" loss is less; if the space volume is large, the loss is also large.
In this project, a cylindrical tank 62 ft 6 in. in diameter is designed for an internal pressure of 4 lbf/in.2 gauge in the vapor space. The plate material is ASTM A131 steel with appropriate grades for different plate thicknesses in accordance with Table 4-1 for a design metal temperature less than 65°F but not less than 25°F. No corrosion allowance is required for any portion of the tank. The top course of the butt-welded cylindrical sidewall is 1/4 in. thick. The roof is a single lap-welded spherical dome with an internal radius of 50 ft and a thickness of 1/4 in. The maximum design liquid level is 6 in. below the plane of the juncture of the tank API Std 650 storage tanks roof and sidewall.
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