Is it feasible to use a combined platform on top of arch-shaped tanks with a diameter of 3.4 meters and a vertical height of over 7 meters?

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The tanks have a diameter of 3.4 meters and a vertical height of over 7 meters; a combined platform is installed at the top of these arch-shaped tanks. 1. The top arch uses a standard end cap, with a height of around 850 millimeters, and railings are installed around this end cap. Additionally, combined platforms are set up at the vertical height of the tank body for several tanks. However, this arrangement makes it difficult to walk around; is such an approach acceptable? How does your factory do it? Are there any pictures? 2. If no passageways are created around the tank for operations, is an arch height of 850 too high? Are there any regulatory requirements in this regard? What is the maximum allowable height for the vault? 3. How can this integrated platform be made more cost-effective and easier to operate? There is a mixer at the top, as well as various instruments such as level gauges that need to be repaired.