14 CAR § 20-113. Flushing valves

(a) Automatic flushing controls shall be required for all drip systems. (b) The flush valve shall be a solenoid or a pressure/flow-compensating valve. (c) Manual flushing valves may be installed in the field flush line. (d) Manually operated valves may be standard ball or gate valves. (e) The flush valve shall be fully opened during a flush cycle regardless of the valve type. (f) The field flushing velocity shall be in accordance with the drip tubing or system manufacturer's recommendations. (g) The minimum field flushing velocity shall not be less than five-tenths feet (0.5’) per second.