A537 class 1 plates API Std 650 ground supported flat-bottom tanks

Tanks which are designed following rules and guidelines of API 650 are API 650 tanks. API 650 API Std 650 ground supported flat-bottom tanks 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 ground supported flat-bottom tanks Tanks must be above ground with a closed or open top.

The specifications used in the design of large oil tanks, API Std 650 ground supported flat-bottom tanks mainly include American Petroleum Institute Standard API 650, Japanese Industrial Standard JIS B8501, British Industrial Standard BS2654 and Chinese National Standard GB50341 from a global perspective. The formulas used in each specification are based on the hoop stress in the membrane theory. Each specification is based on the performance characteristics of materials and the construction technology level of their respective countries to determine the allowable stresses and weld coefficients. Therefore, the calculation results of tank wall thickness of API Std 650 ground supported flat-bottom tanks with the same volume are sometimes quite different according to different specifications.

API 620 Crude Oil Tank Pneumatic Pressure
An air pressure equal to 1.25 times the pressure for which the vapor space is designed shall be applied to the enclosed space above the water level. In the case of a double-wall tank with an open-top inner tank, where the air pressure acts against the outer tank and the inner tank is thus not stressed by the air pressure, the inner API Std 650 ground supported flat-bottom tanks may be emptied of water before the pneumatic pressure test begins. The test pressure shall be held for 1 hour.

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Japan is a typical shipping first, and its raw materials are imported from Oceania, central and South America and other Asian countries. Most of the API Std 650 ground supported flat-bottom tanks steel produced is exported to China and other Asian countries, and a small amount is exported to America. Shipping is the main way of its API Std 650 ground supported flat-bottom tanks steel international transportation. According to the data, steel goods account for about 20% of the total sea freight in Japan. The domestic transportation of Japanese steel is mainly truck.