Pipe Materials in Calgary Presentation Slide #18

It was also at this time that the AWWA C900 spec was approved and we began the switchover from YDI to PVC that offered the hope of an end to metallic corrosion altogether. We were tentative with PVC at first, gradually ramping up it's use after a few years of experiments and some lessons learned about installation technique. YDI was installed in at least equal amounts for four more years.