Oxygen gas in the fire sprinkler system piping is the primary cause of corrosion-related failures.
Oxygen gas present in the fire sprinkler system piping is the primary cause of corrosion-related failures. The only way to effectively control corrosion is to prevent or eliminate the introduction of oxygen into the fire sprinkler system piping.
In wet pipe fire sprinkler systems, it is oxygen in the trapped air at the high points that most often cause corrosion. Periodic testing, draining, and re-filling wet pipe systems accelerate the corrosion with a fresh supply of oxygen gas to react with the pipe metal. Every time the piping is drained and filled the corrosion reaction is reignited with the fresh supply of oxygen in the air that is introduced.
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In dry pipe fire sprinkler systems, it is the periodic introduction of fresh oxygen from the pressure maintenance gas provided by the compressor that accelerates corrosion. Oxygen from the compressed air attacks the pipe at areas where there are trapped pools of water.