API Std 650 cylindrical liquid-storage tank structural shapes

Tanks which are designed following rules and guidelines of API 650 are API 650 tanks. API 650 API Std 650 cylindrical liquid-storage tank is the governing code for Welded tanks for Oil storage normally operating in the atmospheric pressure range. The code API 650 provides guidelines for design, fabrication, material, erection, and inspection of welded vertical and cylindrical storage tanks. Such API Std 650 cylindrical liquid-storage tank Tanks must be above ground with a closed or open top.

In this project, an elemental area of API 620 oil storage tank wall is constructed of ASTM A516 Grade 55 steel plate subjected to a meridional unit force, T1, of 2620 lbf/in. tension and a latitudinal unit force, T2, of 2880 lbf/in. compression. The meridional radius of curvature, R1, is 132 in., and the length of the normal from the surface to the axis of revolution, R2, is 409 in. The joints in the wall are spot-radiographed, double-welded butt joints, and no corrosion allowance is required.
The problem in this example is to graphically find the minimum thickness of tank wall required for the given conditions (see API 620 tank standard 5.10.3.3).
Solution: As determined from Table 5-1, the maximum, allowable tensile stress value, Sts, for ASTM A516 Grade 55 steel plate in simple tension is 16,500 lbf/in.2. Since the compressive stress is latitudinal, the governing value of R for this situation is R1, or 132 in.

Under the condition of static storage without receiving and sending operation, the temperature of gas space, evaporation rate, depth and pressure of vapor in the API Std 650 cylindrical liquid-storage tank will change with the change of temperature and pressure in a day. The oil loss caused by the process of discharging oil vapor and inhaling air gas is called "small breathing" loss, which is also called static storage loss of oil tanks.

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Our company will accept the product quality objection registration record, pass it to the API Std 650 cylindrical liquid-storage tank production unit and relevant departments, and timely coordinate the supervision of product API Std 650 cylindrical liquid-storage tank quality objection. Our company coordinates the relevant department personnel to the customer unit to carry on the investigation, the processing.