First offered in the early 1940s, bar-wrapped concrete cylinder pipe (C303) consists of a welded steel cylinder with steel joint rings at each end, an internal concrete or mortar lining, a spiral-wrapped reinforcing bar around the outside of the steel cylinder and an external coating of Portland cement mortar.
Thompson Pipe Group’s bar-wrapped concrete cylinder pipe combines the strength of steel with the corrosion resistance and durability of concrete. Bar-wrapped concrete cylinder pipe is manufactured in accordance with AWWA C303 Standard and is designed in accordance with AWWA Manual M9.
C303 is manufactured using a welded steel cylinder with sized, welded steel joint rings attached. The pipe interior is lined with centrifugally applied mortar or concrete. A steel bar is helically wound tightly around the outside of the cylinder and securely welded to the steel joint rings. A coating of cement-rich dense mortar is applied to the cylinder and bar wrap. The mortar coating on the pipe creates a passivating alkaline environment that protects the steel cylinder, joint rings and bar from corrosion.
In addition to reliable performance, C303 offers system owners several benefits, including cost-efficiency in terms of materials, handling and installation. A major feature of C303 pipe is its lighter-weight offering — an advantage in shipping, handling and installation. C303 also offers rugged durability, minimal maintenance and long service life, and that all adds up to excellent value for your pipeline investment.
C303 is considered to be a modified version of mortar-lined and coated steel pipe. However, the thicker mortar or concrete lining coupled with the superior bonding between the mortar coating and the bar wrap results in a stiffer pipe more resistant to the effects of external loading.
Transmission/feeder main (open-cut and tunnel)
Treatment facility – yard and/or process piping
Water and/or wastewater intakes / outfalls (subaqueous pipelines)
Sanitary force mains and trunk gravity lines
Cooling water system pipelines
Power and industrial plant piping