If i have toxic, flammable gas and put it via water, will that help me to mitigate the explosive toxic nature?

Question

we feed systems with rich fuel gas, the lines (pipes) will have Pressure Safety Relieve valves, we will have people in the area, but also maybe flames. Will water (Let the pressure valve open up in water/ relieve in water) work to reduce the risks(explosions, fire & toxic atmosphere) associated with this concept?

Answer 1

If the flammable gas exits in water, it could reduce its temperature, and depending on the properties of the substance (flash point, flame point, autoignition temperature and vapor pressure) it could reduce the fire risk.

However, pressure relief valves should exit trough a pipeline outside the risk area, and discharge into the air or into a torch with a flame arrester. If there´s a possibility that the gas ignites or heats after the water trap exit, then another strategy should be implemented, e.g: place the relief valve exit into the water trap, covering the exit with a cap with a pipe acting as a stack, taking the gas out to a safe discharge spot.

The LFL and UFL (lower and upper flammability limits) should be counted as well in deciding the best vent system.

Hope this helps