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A waste pipe gas trap, also known as a P-trap, is a U-shaped pipe used in plumbing systems to prevent the escape of foul sewer gases from entering a building. It works by creating a water barrier that traps the gases in the pipe, while still allowing wastewater to flow through freely. This helps to maintain a sanitary and odor-free environment in the building.
It is not advisable to bury a galvanized gas lineMost civilized codes will not allow galvanized piping to be buried under ground even for waste or venting it is against good plumbing practices. I have seen quite a bit of buried galvanized pipe, both for water and gas. It does rust out eventually. Interestingly enough, it usually rusts through at point at which it comes up out of the ground.
NO!! Black iron pipe has a special coating to resist the highly corrosive effect of natural gas. Galvenized pipe CANNOT be used for gas service.
Because that is what is used for gas.
You should use black pipe -- Galv. pipe will flake off inside of pipe