Regarding the discussion on scaffolding, can someone explain it?

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This is a letter from a quota station addressed to a certain company; it’s difficult to understand. Could any expert in this field explain each part of it and provide examples? Especially the parts marked in red. The relevant details regarding the methods for calculating the workload in the construction of scaffolding for equipment maintenance and repair are as follows: 1. For scaffolds that protrude outward or are suspended for the maintenance and repair of pipe corridors, as well as those that protrude outward (or are single-sided) for the external maintenance of towers, the area for a single layer is calculated based on the vertical projection of the scaffold onto the ground. Area calculation for multi-layer scaffold elevation projection ； 2. Externally extended (double-extended) scaffolding for external maintenance of the tower: For single-story structures, it is calculated based on the difference between the area obtained by projecting the outermost edge of the scaffolding vertically onto the ground and the area of the tower’s outer surface; for multi-story structures, it is calculated based on the area of its elevation projection ； 3. Double-row scaffold for external maintenance of the tower: Calculated based on the area obtained by multiplying the perimeter of the tower’s vertical projection onto the ground by the height of the scaffold ； 4. Independent scaffold for the maintenance of pipe galleries: Calculated based on the sum of the vertical projection areas of all four sides of the scaffold ； 5. For internal maintenance and repair of equipment such as containers, towers, and tanks, a double-row scaffold is erected along the entire circumference of the vessel wall: the area is calculated by multiplying the inner perimeter of the equipment’s vertical projection onto the ground by the height of the scaffold ； 6. Scaffolding for internal maintenance and repair of equipment such as containers, towers, and tanks: For scaffolds with a height of 3.6 meters or less, the basic layer height is calculated based on the area of the equipment’s vertical projection onto the ground; when the scaffold’s height exceeds 3.6 meters, one additional layer is counted for every 1.2 meters added (any amount less than 0.6 meters is not counted). Thank you