What is the function of a hydrocarbon flare water seal tank?

The main flare water seal is a isolation device designed to prevent backflow and ensure the safety of the flare system; it effectively separates the flare system from the plant’s exhaust main, thereby preventing air from entering the vent pipes when the flare is in standby mode and resulting in the formation of explosive gases； At the same time, the water seal tank is also a device used to separate and store the condensate components in the air.

Water replenishment is done indirectly: when the liquid level in the water seal tank is above the designated level, the water replenishment system is turned off; when the level is below the designated level, the system is turned on to supply water

According to current standards and practices, a constant flow of water is provided in a bypass line, along with a flow-limiting orifice plate. On the main pipeline, the opening and closing of valves are controlled based on the liquid level.

OP, it is recommended to share the PID. 1. Generally, a molecular seal is installed on the torch to prevent backfire, but to ensure safety, there must be water inside the water seal. 2. Check the pipeline settings. To ensure that there is water at the desired liquid level, the common design approach is to use a water seal, and such a water seal is equipped with a water supply valve. So how is the liquid level maintained? The water supply valve can be designed as a self-controlled valve, and a level gauge can be used to achieve automatic control, but this involves high costs. A cost-saving approach is to use a U-shaped bend, which allows for overflow. If an overflow condition is designed, it is recommended to keep the small valve in the overflow position; this is how it is controlled as well. 3. Is heating incorporated into the water supply pipeline? If not, extra care is needed in winter – open the valves wider; otherwise, freezing and blockages can occur, which would be troublesome.

If the water level in the water seal tank is too high, it may prevent the flare gas from being discharged in a timely manner, resulting in pressure buildup upstream. Generally, a relief valve is installed to ensure that the level does not exceed a certain threshold, in accordance with the set liquid level. Furthermore, failing to replace the water over a long period of time can lead to an accumulation of oil residues inside the tank, which may cause blockages in the inlet and outlet pipes. Moreover, not carrying out regular replacement procedures has an impact on the overall lifespan of the equipment

The liquid level in the water seal tank needs to be maintained within a certain range to prevent backflow.