Your drawings must clearly show what is existing and the changes you’re proposing. Drawings must be to scale, and should use metric measurements. We may request additional information when your application is reviewed.
Detailed drawings sealed, signed and dated by a professional engineer showing:
Installation methods of the backflow prevention device
Expansion tank details complete with sizing calculations, a certified thermal expansion relief valve with reference to the applicable CSA Standard, or other method deemed acceptable by the authority having jurisdiction
Backflow prevention device valve specification with reference to the applicable CSA B64 Standard
If the backflow prevention device(s) is to be installed in a water system that serves a fire protection system (sprinkler, standpipe), additional details will be required.