Phosphorus trichloride evacuation

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Recently, in connection with work-related tasks, there has been a need for designs related to phosphorus trichloride. I would like to invite everyone to discuss the following points: 1. Two storage tanks for phosphorus trichloride should be installed, one in operation and one as a backup. A underground tank for phosphorus trichloride should be set up, and a submersible pump will be used to transfer the phosphorus trichloride from this underground tank to the upper-level tank for use in product synthesis. The feed to the underground tank is interlocked with the discharge cut-off valve of the underground tank via a level gauge, and a level alarm along with probe monitoring are provided. The high-level tank is equipped with a weighing function, and the weighing system is interlocked with the start/stop control of the submersible pump; the submersible pump automatically shuts off once the weight in the high-level tank reaches a certain level, while it can only be started manually. An overflow pipe is provided in the high-level tank; in the event of a failure in the interlock system, phosphorus trichloride flows into the lower tank through this overflow pipe. I’m not sure what else needs to be improved, and I would appreciate your guidance. 2. Drainage arrangements for the low-level tanks, high-level tanks, and underground tanks: We plan to use a nitrogen seal for the low-level tanks. The exhaust from the nitrogen seal valve is connected to the drainage systems of the underground and high-level tanks, and after being washed with alkaline water, it is released into the atmosphere. Given the strict requirements regarding odor control at the site, we would appreciate it if experts could review this drainage plan and suggest any additional measures that may be necessary.