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This part of EN 1852 specifies the requirements for pipes, fittings and the system of polypropylene (PP) piping systems in teh field of -- non-pressure underground drainage and sewerage outside the building structure (application area code "U", and -- non-pressure underground drainage and sewerage for both buried in ground within the building structure (application area code "D") and outside the building structure. This is reflected in the marking of products by "U" and "UD". It also specifies the test parameters for the test methods referred to in this standard. This standard covers a range of nominal sizes, a range of pipe series/stiffness classes and gives recommendations concerning colours. NOTE 1: It is the resposibility of the purchaser or specifier to make the appropriate selection from these aspects, taking into account their particular requirements and any relevant natinal regulations and installation practices or codes. In conjunction with Part 2 and Part 3 of EN 1852 it is applicable to PP pipes andf ittings, their joints and to joints with components of other plastics and non-plastics materials intended to be used for buried piping systems for non-pressure underground drainage and sewerage. This standard is applicable to PP pipes with or without and integral socket. NOTE 2: The fittings can be manufactured by injection-moulding or be fabricated from pipes and/or mouldings. NOTE 3: Requirements and limiting values for application area code "D" are given in table 3, table 6 and table 12. NOTE 4: Pipes, fittings and other components confirming to any of the plastics product standards listed in annex B may be used with pipes and fittings conforming to this standard, when they conform to the requirements for joint dimensions given in clause 6 and to the requirements of table 12.