what psi to blow out sprinklers

When blowing out a sprinkler system, it is important to use the correct air pressure to avoid damaging the pipes. The recommended PSI ratings for blowouts are not to exceed 50 PSI for general safety and efficiency. Some sources recommend not exceeding 80 PSI for PVC piping or 50 PSI for polyethylene piping. It is also important to use an air compressor with the recommended PSI and CFM ratings (50 PSI and 20-50 CFM) . The ideal pressures are in the range of 40 to 80 pounds per square inch (psi) for the air compressor, with 80 psi being the maximum for rigid PVC pipe and 50 psi for polyethylene pipe (flexible black pipe) . It is recommended to use a pressure-regulating valve to avoid over-pressurizing the system.