On the corrosion protection of buried storage tanks

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What I want to ask is whether the tank body of buried storage tanks is painted with 6 layers or 7 layers? Is there a **standard** for this? Process: Apply epoxy zinc-rich primer, epoxy ferrochrome intermediate coat, and polyurethane topcoat. After the surface treatment is completed and the hidden works pass self-inspection as well as acceptance checks, apply the epoxy zinc-rich primer in two coats, ensuring a dry film thickness of no less than 70μm; once again, self-inspection and acceptance checks must be passed. Then, apply the epoxy limonite intermediate coat in two layers, with a dry film thickness of not less than 70μm; after self-inspection and acceptance checks, it is deemed satisfactory. Regarding quality and aesthetics, the topcoat is applied after the storage tank has been installed. The painting method involves applying paint from top to bottom and from the inside out, ensuring even coverage. This ensures that areas such as welds and corners are painted evenly, without any issues such as runaways, cracks, bubbles, or incomplete coverage. The desired dry film thickness is achieved, and the coating thickness meets the specified requirements.