API standard 650 unanchored tanks shells

Design calculations and drawings required API standard 650 unanchored tanks for the fabrication and erection of each API 650 tank. A drawing index for each API 650 tank is required and shall be re-submitted each time drawings are revised and re-issued.

The water dissolved in the oil will be separated out from the oil stored in the API standard 650 unanchored tanks for a long time, and the acidic water layer will appear at the bottom of the API standard 650 unanchored tanks for a long time, which will accelerate the corrosion of the API standard 650 unanchored tanks and cause the wall thinning and even leakage. With the increase of service life, the API standard 650 unanchored tanks must be inspected and cleaned regularly to check the hidden danger.

The API standard 650 unanchored 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.

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