Dry and pre-action systems are the world’s second most common type of fire suppression system. With increasingly widespread use of these systems, the issue of corrosion was pushed to the forefront. Initially, galvanized pipe was given a preferential Hazen-Williams C factor, of 120, for use in dry or pre-action systems. This was done with the expectation that galvanized pipe would experience less corrosion. A C factor is a value used to indicate the smoothness of the interior of a pipe. The higher the C factor, the smoother the pipe, thus maximizing the carrying capacity and diminishing the friction, or energy lost, from water flowing through the pipe.