![]() ![]() ![]() One test weld shall be made on a set of plates from each specification and grade of API Std 650 ground-supported liquid storage tanks plate material, using a thickness that would qualify for all thicknesses in the shell. The API 620 steel storage tank test plates need not be welded as an extension of the tank shell joint but shall be welded in the required qualifying positions. Test plates shall be welded using the same qualified welding procedure and electrodes that are required for the tank shell plate joints. Atmospheric API Std 650 ground-supported liquid storage tanks usually have a connecting pipe directly connected to the atmosphere, so that the operating pressure in the storage tank does not exceed the design pressure at all times. Metal atmospheric storage tanks made of steel welded on the ground are often used to store petroleum, chemical and other similar liquids. ![]() Atmospheric API Std 650 ground-supported liquid storage tanks refer to storage tanks whose gas or vapor pressure is greater than -0.02MPa but less than 0.1MPa. ![]()
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