Design and construction of foundations for API 650 duplex stainless steel tanks

API 650 petroleum storage tank body design is mainly the design of tank bottom, API 650 duplex stainless steel tanks tank top and tank wall, and the design of tank wall is particularly important. As the main pressure bearing part of API 650 petroleum storage tank, the tank wall bears loads including liquid pressure, wind pressure, seismic load, opening stress, etc. The calculation of such loads is explained in detail in various API 650 duplex stainless steel tanks storage tank design standards. But in addition, the API 650 petroleum storage tank wall also bears the push-pull force and torque of the connected pipeline.

Large Low-Pressure Tanks Corrosion Allowance
In cases in which the rate of corrosion is closely predictable, additional metal thickness over and above that required for the initial operating conditions shall be provided and shall be at least equal to the expected corrosion loss during the desired life of the tank.
When corrosion effects are indeterminate before the tank is designed (although they are known to be inherent to some degree in the service for which the tank is to be used), and when corrosion is incidental, localized, or variable in rate and extent, the best judgement of the API 650 duplex stainless steel tanks designer must be exercised in establishing reasonable maximum excess tank wall thicknesses. For all tanks that come under this classification, a minimum corrosion allowance of 1/16 in. shall be provided.

Generally speaking, the duration of the "exhalation" of the API 650 duplex stainless steel tanks is longer than that of the "inhalation" of the API 650 duplex stainless steel 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 650 duplex stainless steel tanks location, open area of the API 650 duplex stainless steel tanks, atmospheric pressure, filling degree of API 650 duplex stainless steel tanks, etc. When the API 650 duplex stainless steel 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.

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