60m diameter API standard 650 carbon and low-alloy steel tanks
The manufacturing requirements of bottom plate of vertical metal tank, API standard 650 carbon and low-alloy steel tanks are as follows: 1. In order to compensate welding shrinkage, the layout diameter of tank bottom is 5-2mm than the design diameter; 2. The butt joint of edge plate of tank bottom shall be machined automatically or semi-automatically; 3. The distance between any two adjacent welding joints on the tank bottom plate and the distance between the butt joint of edge plate and the longitudinal weld of bottom ring wall plate shall not be greater than 200 mm.
The API standard 650 carbon and low-alloy steel 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 standard 650 carbon and low-alloy steel 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 standard 650 carbon and low-alloy steel 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 standard 650 carbon and low-alloy steel 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.
