NFPA 13 - 2013, section 8.3.4.4 states that K 4.2 heads can be used on dry pipe
systems if the piping is corrosion resistant or internally galvanized.
I have somebody telling me that Allied Dyna-Thread has a corrosion resistant
coating which conforms to 8.3.4.4, which I disagree with, but is there a steel
pipe that is corrosion resistant but not galvanized?
Greg Lindholm
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