Key quality control points for the design, manufacturing, and installation of reaction vessels ---- Equipment positioning, alignment, leveling, and assembly

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V. The following technical documents must be available prior to equipment installation: 1. Factory certification, instruction manual, quality certificate, and packing technical documents; 2. An approved construction plan for major equipment; 3. Design and manufacturing drawings for special tools that have been approved; 4. Construction drawings that have been finally finalized. 5. The measuring, inspection instruments, and tools used during equipment installation must meet the accuracy standards specified by the **metrology authorities, and they must pass regular inspections. VI. Equipment positioning, alignment, leveling, and assembly 1. The alignment and leveling of the equipment should be carried out by making adjustments and measurements based on the installation reference lines on the foundation, in relation to the reference points on the equipment itself. The criteria for adjustment and measurement are specified as follows: 1) The elevation of the bottom surface of the equipment supports (skirt supports, ear supports) should be based on the elevation reference line on the foundation; 2) The position and orientation of the equipment are determined with reference to the center line of the foundation; 3) The verticality of vertical equipment should be assessed using the markings at 0°, 90°, 180°, and 270° on the equipment; 4) The levelness of horizontal equipment is generally determined based on the center lines on both sides of the equipment. 2. Supplementary measurement points for the alignment and leveling of equipment should be selected at the following locations: 1) the main flange openings (referring to the inlet and outlet of the equipment’s materials); 2) horizontal or vertical contour surfaces; 3) other designated reference surfaces or machined surfaces. 3. The alignment and leveling of equipment shall comply with the following provisions: 1) Alignment and leveling should be carried out in two or more directions that form right angles to each other within the same plane; 2) For vertical equipment with a height exceeding 20 meters, to avoid the influence of weather conditions, the adjustment and measurement of its verticality should not be performed when one side is exposed to sunlight or when the wind speed is above level 4; 3) When aligning and leveling equipment, shims (or other specialized adjustment components) should be used as required for adjustment; adjustments should not be made by tightening or loosening foot bolts or applying local pressure.