There is a water seal well installed after exiting the sump pool inside the fire dike; my question is??
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I would like to ask: After the sump pool inside the fire dike, there is a water seal well installed, and behind that water seal well there are two pathways (each with its own valve well) – one leading to the sewage system and the other to the rainwater system. My question is: 1. Is this arrangement reasonable? 2. If it is methanol, is a water seal well useful? Methanol is water-soluble. 3. Are there any distance requirements between the water seal well, the valve well, and the fire dike? It is best to have a legal basis.
1. It is reasonable and appropriate; after the initial rainfall (15 minutes), the water becomes clean rainwater, and the system should switch to the rainwater gutter. In the initial stage, use polluted rainwater; in case of an accident, switch to wastewater. This is the separation of rainwater and sewage. 2. The function of a water seal well is to prevent flammable and explosive gases from flowing through pipelines between various devices; it is essential. 3. GB 50351-2014 Code for Design of Fire Dikes in Tank Farm Areas
A water seal is essential; it is a strict requirement under petrochemical regulations. An accident was handled in accordance with this rule, as in the Chengda Wuhai project.
Water sealing and shunting are two different requirements.