This document gives guidance for the assessment of conformity of materials, products, joints and assemblies in accordance with the applicable part(s) of EN 1451 intended to be included in the manufacturer’s quality plan as part of the quality management system and for the establishment of third-party certification procedures. NOTE 1 – The quality management system is expected to conform to or is no less stringent than the relevant requirements to EN ISO 9001 [1]. NOTE 2 – If third-party certification is involved, the certification body is expected be accredited to EN ISO/IEC 17065 [2] or EN ISO/IEC 17021 [3], as applicable. NOTE 3 – In order to help the readers, a summary of the test regime is given in Annex A. In conjunction with EN 1451 1 this document is applicable to piping systems made of polypropylene (PP) intended to be used: - for soil and waste discharge systems (low and high temperature) inside buildings (application area code “B”) and, - for soil and waste discharge systems (low and high temperature) for both inside buildings and buried in ground within the building structure (application area code “BD”) This is reflected in the marking of products by “B” or “BD”.