This International Standard specifies the requirements and test methods applicable to ductile iron pipes, fittings, .accessories and their joints for the construction of drains and sewers outside buildings: - to be operated by gravity or under positive or negative pressure; - to be installed below or above ground; - to convey surface water, domestic waste water and/or certain types of industrial effluents (see annex B), either in separate systems or in mixed systems. This International Standard specifies products for gravity sewers and for sewer sections operated under pressures which do not normally exceed 6 bar. For higher pressure applications, special pipe thickness may be required by agreement between the manufacturer and the purchaser. NOTE - In this International Standard, all pressures are relative pressures, expressed in barsl). This International Standard contains specifications for materials, dimensions and tolerances, mechanical properties and standard surface protection of pipes, fittings and accessories. It also indicates performance requirements for all components i ncl ud i ng joi n ts. This International Standard covers pipes, fittings and accessories cast by any type of foundry process or manufactured by fabrication of cast components, as well as corresponding joints, of a size range extending from DN 100 to DN 2 600 inclusive. 0 This International Standard applies to pipes, fittings and accessories which are - manufactured with socketed, flanged or spigot ends for jointing by means of various types of gaskets which are not within the scope of this International Standard; - normally delivered internally and externally coated.