API 650 flexible liquid storage tanks cover plates

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

Any joints between the adjacent sections of API 620 oil storage tank stiffening rings, as shown in Figure Q-1, shall be made so that the required moment of inertia of the combined ring-shell section is provided. Weld joints between adjacent sections shall be made with full-thickness and full-penetration butt-welds. Stiffening-ring butt-welds may employ metal backing strips. Backing strips and the associated welding shall be made in a manner that provides a smooth contour in the rat hole and all other weld joint ends. All weld passes shall be started at the rat hole and other weld joint ends and shall be completed by moving away from these ends. Passes shall be overlapped away from edges to provide a smooth continuous weld.

The welded steel API 650 storage tank API 650 flexible liquid storage tanks is designed, manufactured and installed on the surface according to the API standard system classification. API 650, API620 and API 12D belong to the API standards for professional construction.