18-29-1111.3.4 Piping.
   Discharge piping shall meet the requirements of Section 18-29-1102.2, Section 18-29-1102.3 or Section 18-29-1102.4 and shall include a full flow check valve. Duplex pump systems shall include a gate valve and a full flow check valve on discharge of each pump. Size and fittings shall be the same size as, or larger than, pump discharge tapping, nominal or standard sizes as designated in the referenced materials standards.