How should storage tanks with internal floating roofs and heating coils, in which the density of the oil is greater than that of water, be processed technically? Please share your opinions

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Dear experts, tank cleaning is a skill that we must master, and determining how to clean a tank so that maintenance work can be carried out safely is an issue that we need to study. I now have a storage tank as follows that I would like to discuss with everyone; I hope everyone will share their opinions! Given: 1. Internal floating roof tank with a capacity of 1000 m3. 2. The oil inside the tank is a water-soluble oil with a density greater than that of water. My idea is: 1. Draw the oil in the tank to its lowest level by drawing off the bottom liquid. 2. Use a diaphragm pump or portable pump to drain the remaining oil in the tank through the dehydration port into another tank or an oily waste tank. 3. Steam the storage tank with low-pressure steam for 48 hours. 4. Transfer the condensate and water to the sludge oil tank through the dehydration outlet. 5. Allow natural ventilation for 36 hours until sampling and analysis upon re-inspection show satisfactory results. 6. Use a high-pressure water gun to clean the storage tank, and drain the water into the sewage system. 7. Use cleaning tools such as copper shovels and wooden pushers to empty the storage tank. Do any of you experts have any other good methods? Please give me some advice!