Dramatically different corrosion threats exist for fire protection system depending upon whether they are dry sprinkler / preaction, or wet sprinkler or standpipe. Within the fire protection industry, the greatest threat is generally to "dry" fire systems since the potential exists for sufficient rust product to totally block water flow during a fire emergency.
Generally, the corrosion threat to all fire systems is related to the volume and frequency of fresh water added to the system, with other issues, such as the installation of thin wall piping also involved.
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