With the installation of residential fire sprinkler systems becoming more widespread, the city of Edmonton, Alberta, foresaw a need for better guidelines for designing and sizing these systems. The city constructed experimental test service lines to obtain up-to-date information on head loss for copper, polyethylene, and polyvinyl chloride pipe, as well as associated meters and valves. Test results and data are presented here along with equations that can be used to more accurately calculate pipe sizes. Includes 10 references, tables, figures.