scope:

This part of ISO 21138, together with ISO/CD 21138-1, specifies the definitions and requirements for pipes with a non-smooth external surface (Type B), fittings and systems based on unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) structured-wall piping systems intended to be used in non-pressure underground drainage and sewerage applications. This part of ISO 21138 covers products intended for installation at normal burial depth (i.e. ≤ 6m) and also gives requirements for pipes intended for deeper installation (i.e. > 6m). ISO/CD 21138-1 Annex C gives guidance for structural design. NOTE 1 - Fittings are not foreseen to be used in deep installation NOTE 2 - Pipes, fittings and the system complying with this standard may also be used for highway drainage and surface water. This part of ISO 21138 specifically refers to PVC-U, PP and PE materials. This part of ISO 21138 specifies test methods and test parameters. This part of ISO 21138 covers a range of pipe and fitting sizes, materials, pipe constructions and nominal ring stiffnesses, and gives recommendations concerning colours. NOTE 3 - It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes. In conjunction with ISO/CD 21138-1, it is applicable to PVC-U, PP and PE structured-wall pipes and fittings, to their joints and to joints with components of other plastics and non-plastics materials intended to be used for buried piping systems for the transport of drainage and sewage. It is applicable to PVC-U, PP and PE structured-wall pipes and fittings with or without an integral socket with elastomeric ring seal joints as well as welded and fused joints. NOTE 4 - Pipes, fittings and other components conforming to any plastics product standards referred to in Clause 2 can be used with pipes and fittings conforming to this part of ISO 21138, when they conform to the requirements for joint dimensions given in parts 2 and 3 of this International Standard and to the performance requirements given in Clause 10. NOTE 5 - For dimensions larger than DN/OD 1200 or DN/ID 1200, this part of ISO 21138 can serve as a general guide regarding appearance, colour, physical and mechanical characteristics as well as performance requirements.