(a) Suction and discharge piping shall be designed to minimize head loss and turbulence.

(b) Suction and discharge headers shall be located outside the pumping station.

(c) Interior station piping and fittings (supply, discharge, and drain piping) shall be cement mortar lined ductile iron. Exposed pipes shall be jointed by means of flanged connections or flexible couplings. Wherever a pipe passes from a concrete structure to earth, a push-on or mechanical joint or a flexible coupling shall be installed within three feet of the structures. Valved drain outlets shall be installed in the header loop system for maintenance drainage.

(d) Couplings of the dresser type shall be installed on the suction and discharge piping, so that the pumps or valves can be easily removed. Coupling shall have joint harnesses. See piping schematic on Drawing DG-02-1 for preferred locations of couplings.

(e) At booster stations with pumped storage, piping interconnections to recycle the stored water in order to obtain desired residual chlorine levels in the stored water shall be provided. (28-ME-DG-02 § 8.1)