Ductile iron pipessupplied with standard of ISO2531:2009, K9 the effective length is6.0meters with T type joints, the pipes shall be provided withgaskets for the jointing according to ISO4633. Internal lining:D.I.Pipes shall have common cement mortar lining with as perISO4179 External coating: D.I.Pipes shall be externally coated withmetallic zinc spray plus a further layer of resin painting toISO8179 applied at120g/M2, epoxy painting 90 microns thickaccording to ISO4178