API 650 welded steel oil storage tanks EN specifications plates
The calculated thickness of the above-mentioned wall panels required by the hydrostatic pressure is also It API 650 welded steel oil storage tanks should be increased by the same ratio, unless special analysis is performed to determine the seismic overturning moment and the corresponding stress at the bottom of the wall of each layer of API 650 tank.
The cleanliness of the API 650 welded steel oil storage tanks has a great influence on the safety of the tank and the quality of the oil stored. Keeping the API 650 welded steel oil storage tanks clean can slow down the corrosion of the tank wall and reduce the pollution to the oil. If the inside of the API 650 welded steel oil storage tanks is not cleaned all the year round, a lot of rust and metal impurities will be produced in the tank. These impurities will cause the oil to slowly oxidize and deteriorate. The impurities mixed into the oil will also block the filter and oil circuit, causing oil supply failure.
Preheating should be performed by heating and maintaining this heat in appreciable lengths of the joint to be welded, preferably using a strip burner with a mild flame rather than a harsh flame such as that from a cutting torch. Electrical strip heaters are available and have been found to be satisfactory. The preheat of 300°F should be checked with a temperature-sensitive crayon, or similarly accurate means, so that the steel 4 in. (or four times the API 650 welded steel oil storage tanks plate thickness, whichever is greater) on each side of the joint will be maintained at the minimum preheat temperature. Ring burners or heaters are recommended for nozzle and manway welds. At no time during the welding should the base metal fall below a temperature of 300°F.
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