CONCRETE PIPE What is Concrete Pipe? Concrete pipe provides a structurally reinforced conduit for stormwater and effluent, and is manufactured in sizes ranging from 300 mm to 3000 mm in diameter depending on the manufacturer. The glossary and depictions below highlight the key features and terminology typically associated with the concrete pipe industry. Nominal Diameter — the internal pipe diameter (or pipe i.d), rounded to the nearest 25 mm increment corresponding to the imperial measurement. Lifting Pin — concrete pipe is equipped with lifting (or anchor) pins located at the top of the pipe. These pins are rated according to weight, and connected via a clutch and chain. Bell/Spigot — the bell end of the pipe refers to the receiving portion of the pipe joint (left side, depicted above), whereas the spigot represents the entering portion (right side, depicted above). The spigot end of the pipe is always directed downstream for any installation. End Type (Bell/Straight) — for pipe sizes 1050 mm (42”) or less, the bell end of the pipe protrudes from the length of the pipe. For sizes 1200 mm (48”) and larger, the bell is flush with the pipe section. Depending on the manufacturer there may be some overlap between the end types. Wall Designation — within the concrete pipe industry there exists three wall designations; A, B, and C. At Lafarge, all pipe is manufactured to either B or C wall designations. The thickness of wall section for a B Wall pipe is approximately equal to the internal diameter in inches, divided by twelve, plus one [i.e. 48” (1200 mm) diameter pipe has a wall thickness of 5” (127 mm)]. The thickness of wall section for a C Wall pipe is approximately equal to the internal diameter in inches, divided by twelve, plus one and three quarters [i.e. 48” (1200 mm) diameter pipe has a wall thickness of 5.75” (146 mm)]. Please check with your local manufacturer when specifying wall thicknesses to ensure its availability. PAGE 4 LAFARGE PIPE eMANUAL