API Std 650 floating-roof tanks welding requirements
The establishment of a correct method for evaluating the life of API Std 650 floating-roof tanks requires the preparation of criteria related to the strength and cracks of API Std 650 floating-roof tanks, mechanical damage mechanisms, corrosion mechanisms, and mathematical models of fatigue crack growth, etc., which are compiled into computer programs. In the process of programming the program, it is required to select the operating parameters, plates, reinforcement accessories, metal properties, corrosion levels, mechanical damage defects and other data of the oil storage tank under various conditions.
The API Std 650 floating-roof 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.
The internal floating plate of internal floating roof tank of API 650 tank is different from that of open floating plate of API Std 650 floating-roof tanks External floating roof tank of API 650 tank, so it is impossible to have rain and snow load.
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BBN steel strictly control quality of our carbon steel plate, alloy steel plates and structural steel plates. For API Std 650 floating-roof tanks ASTM A572 Grade 50 structural steel plate, Our Q/C Department will inspect dimension before shipment, making sure structural steel plate thickness tolerance and width, length tolerance are matchable to the API Std 650 floating-roof tanks standard requirements. The company is a good ASTM A572 Grade 50 structural steel plate supplier in the globle market and the head is located in China. Welcome to send us inquiry and questions about structural steel plate.
