introduCtion Joints The function of a pipeline generally determines performance requirements of the pipe joints. For example, the permissible infiltration or exfiltration in a sanitary sewer is usually less than that for a storm drain or culvert. Concrete pipe manufacturers have developed joint designs to provide the following performance characteristics: • Resistance to infiltration of groundwater and backfill material • Resistance to exfiltration of sewage or storm water • Control of leakage due to internal or external pressure • Flexibility to accommodate lateral deflection or longitudinal movement • Pipeline continuity and smooth flow line • Infiltration of groundwater for subsurface drainage • Ease of installation The actual field performance of pipe joints depends primarily upon the inherent characteristics of the joint, conditions of service, and the care with which the joint is installed. The designer of a pipeline need specify only the joint performance requirements, and the pipe manufacturer will supply pipe with a joint to meet the specifications. ConCrete pipe stormwater treatment teChnologies JOINT CONFIGURATIONS At Lafarge, the two basic joints configurations most often used are: • Single Offset • Confined O-Ring The use of either joint configuration is dependant on the size of pipe and local manufacturer. box seCtions manhole and CatCh basin material LAFARGE PIPE eMANUAL PAGE 57