Copper-bearing steel sheets API Std 650 SUG I tanks
Application scope of API 650 petroleum storage tank:1. API Std 650 SUG I tanks Working pressure: atmospheric storage tank;2. API 650 petroleum storage tank working temperature: -30℃～150℃;3. API 650 petroleum storage tank liquid medium: various oil products, including naphtha, gasoline, diesel, kerosene, crude oil, fuel oil, heavy oil, benzene, xylene, methanol, ethanol;4. API 650 petroleum storage tank volume: current design considerations generally do not exceed 10,000 cubic meters.
The API Std 650 SUG I tanks stiffener ring and backing strip (if used) are primary components, and they shall comply with the requirements of API 620 storage steel tank Q.2.1. The stiffener rings may be fabricated from plate using an intermittent weld on alternating sides between the web and the flange.Except for aluminum or stainless steel tanks, all fillet welds shall consist of a minimum of two passes. The ends of the fillet welds shall be 2 in. from the rat hole (see Figure Q-1), and these welds shall be deposited by starting 2 in. from the rat hole and welding away from the rat hole. An acceptable alternative to the detail that includes stopping fillet welds 2 in. short of the rat hole would be to weld continuously through the rat hole from one side of the stiffener to the opposite side. All craters in fillet welds shall be repaired by back welding.
To scientifically evaluate the remaining service life of the API Std 650 SUG I tanks, it is necessary to know the thickness change and development trend of the storage tank sheet after long-term use, combined with the metal characteristics of the storage tank, the influence of various external conditions and the continuous change of the oil pressure in the API Std 650 SUG I tanks, etc. factors to judge. Because the metal characteristics, corrosion defects, load and other numerical parameters of the API Std 650 SUG I tanks are randomly changed, the value of the remaining service life of the storage tank will also be dynamic.
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