【Discussion】Measures for collecting initial rainwater in process unit areas such as low-temperature methanol washing
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:loveliness: Hello, everyone! For the methanol and ammonia synthesis projects designed by our company, the approach adopted is to install drainage ditches and collection tanks around the low-temperature methanol washing unit. The collection tanks are equipped with two outlet pipes fitted with valves that can be switched between each other, leading respectively to the sewage system and the rainwater system. During the initial stage of rainfall and under normal conditions, the valves of the wastewater system are opened; after 10 minutes of the initial rainfall, the valves of the rainwater system are switched on. The same switching measures were applied to the tank farm, but no collection measures were taken in other process unit areas. There are several issues with the approach mentioned above, mainly as follows: 1. The valves are switched manually; operating them manually in rainy weather does not conform to human-centered design principles ； It is also impractical and difficult to implement. 2. Rainwater ditches with grating plates are installed around the device, posing a risk of the accumulation of flammable gases. What collection measures are in place for initial rainwater in the relevant project? :Handshake, thank you.
This is what I know about the current practices. What can be done is to optimize the system design by trying to install such switching facilities along the main drainage channels, thereby reducing the number of such facilities. Additionally, in both the early stages of rainfall and under normal conditions, the valves leading to the sewage system are kept open. Has it been considered to keep these valves closed at all times? I’m not sure what kinds of materials your company handles; sometimes, small amounts of material that leak can still be recovered using barriers or similar methods. If the valves remain open, all of that material ends up in the sewage system, increasing the risks associated with the sewage networks as well as the processing load on the sewage treatment plants.