introduCtion Pipe Class Estimation Pipe Diameter (mm) Installation Type 1 300 2 3 4 1 375 2 3 4 1 450 2 3 4 1 525 2 3 4 1 600 2 3 4 1 675 2 3 4 1 750 2 3 4 1 900 2 3 4 1 1050 2 3 4 1 1200 2 3 4 6.2 4.4 3.5 6.3 4.6 3.6 7.8 5.5 4.4 3.1 7.9 5.7 4.5 3.2 8.0 5.8 4.7 3.4 11.6 8.1 6.5 4.5 11.6 8.2 6.6 4.6 11.7 8.2 6.6 4.7 11.7 8.3 6.7 4.9 11.8 8.5 6.8 5.0 11.9 8.6 7.0 5.2 Maximum Depth to Invert for: Class II Class III Class IV ClassV 14.9 10.5 8.2 5.4 15.4 10.8 8.5 5.7 15.7 11.0 8.7 5.9 15.9 11.1 8.9 6.1 16.0 11.2 9.0 6.2 16.1 11.3 9.1 6.4 16.1 11.3 9.1 6.5 16.1 11.4 9.2 6.7 16.3 11.6 9.3 6.9 16.3 11.8 9.5 7.0 3000 2700 2400 2100 1950 1800 1650 1500 1350 Pipe Diameter (mm) Installation Type 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 Maximum Depth to Invert for: Class II 6.4 4.7 3.7 6.5 4.8 3.8 6.6 4.9 3.8 6.6 4.9 3.9 6.7 5.1 4.0 6.8 5.2 4.0 7.0 5.4 7.2 5.6 7.4 5.8 Class III 8.1 5.9 4.8 3.5 8.2 6.0 4.9 3.6 8.3 6.1 5.0 3.7 8.3 6.2 5.0 3.7 8.4 6.4 5.2 3.9 8.5 6.5 5.3 8.7 6.7 5.5 8.9 6.9 5.7 9.1 7.2 5.9 Class IV 12.0 8.7 7.1 5.3 12.1 8.8 7.1 5.5 12.1 8.9 7.3 5.6 12.2 9.0 7.3 5.7 12.3 9.2 7.5 5.8 12.4 9.3 7.6 6.0 12.5 9.5 7.8 6.2 12.7 9.8 8.1 6.4 12.9 10.0 8.3 6.7 Class V 16.4 11.9 9.6 7.2 16.5 12.0 9.6 7.3 16.5 12.1 9.7 7.5 16.6 12.2 9.8 7.6 16.7 12.3 10.0 7.8 16.8 12.4 ConCrete pipe stormwater treatment teChnologies box seCtions 10.1 7.9 16.9 12.7 10.3 8.1 17.0 13.0 10.6 8.4 17.2 13.2 10.8 8.6 manhole and CatCh basin material Notes: Table based on recommended loadings and calculations from “Standard Practice for the Design and Installation of Rigid Gravity Sewer Pipe in the City of Calgary”, January 2008. For other market areas, please contact your local Lafarge representative. LAFARGE PIPE eMANUAL PAGE 37