Fire fighting pipe is a type of normal carbon steel pipe used to convey fire suppression agent such as water or gas. Usually it is red in color. But light-wall pipes have a galvanized exterior of a silvery appearance. Installation of red steel pipe is limited to wet pipe sprinkler systems only. Installation of galvanized pipe is allowed in wet and dry pipe sprinkler systems (including preaction pipe sprinkler systems).
Understanding Out Diameter (OD) vs Nominal Diameter (NB): What You Need to Know
Wang, Zoe
July 12, 2023