This specification was one of a number of specifications which had been prepared by WRc in consultation with the Water Industry and the British Plastics Federation in order to assist engineers responsible for renovation of sewers. It covered polyethylene pipes suitable for Type II lining designs as defined in the Sewerage Rehabilitation Manual (published by WRc) and in which simplified design charts are shown. It was intended that the pipes should be joined by butt fusion welding, inserted into sewers and the remaining annulus subsequently grouted using cementitious grout.
The WUK Standards Board commissioned a review of IGN 4-32-05 that concluded in March 2023. Based on the review’s findings the Board determined that the document’s status should be changed from ‘current’ to ‘archived’ since:
- Other British European and International standards now exist that cover its content.
- The references to other standards within this IGN are considerably out of date.
There are 12 standards and specifications referred to in this IGN. All are now withdrawn, updated, no longer applicable or have been replaced by later BS EN, BS ISO, or BS EN ISO standards.
Relevant standards are now:
- BS EN 12201 (parts 1-5 & 7) Plastics piping systems for water supply, and for drainage and sewerage under pressure – Polyethylene (PE);
- BS ISO 4427 (parts 1-3 & 5) Plastics piping systems for water supply and for drainage and sewerage under pressure — Polyethylene (PE);
- BS EN ISO 11295: 2022 – TC Plastic piping systems for the rehabilitation of pipelines. Classification and overview of strategic, tactical and operational activities;
- BS EN ISO 11296-1: 2018 – TC Plastic piping systems for renovation of underground non-pressure drainage and sewerage networks – General;
- BS EN ISO 11296-2: 2018 – TC Plastic piping systems for renovation of underground non-pressure drainage and sewerage networks – lining with continuous pipes;
- PD CEN ISO/TS 23818-1:2020 Assessment of conformity of plastics piping systems for the rehabilitation of existing pipelines – Polyethylene (PE) material.
Consultation, prior to reaching a decision to archive IGN 4-32-05, included the BSI Committees responsible for plastic pressure pipe (PRI/88/2) and rehabilitation (PRI/88/3), which included representation from the British Plastics Federation (BPF) and the United Kingdom Society for Trenchless Technology (UKSTT), from where it was discussed further and further circulated within the membership of those organisations. It was also circulated to WRc and the Sewer Rehabilitation Contact Group (SRCG) directly. Responding consultees’ were unanimous in recommending that the IGN should be archived.
In addition to standards for PE pipe materials (including the EN 12201 series), there are a number of rehabilitation standards that apply to both pressure and non-pressure applications. ISO 23818-1 covers assessment of conformity, which in turn refers to other standards, and Annex A of ISO23818-1 applies to non-pressure applications.
Cured-in-Place Pipe (CIPP) has now largely replaced PE pipe as an option for gravity sewers, except for pipe bursting and re-rounding, although push fit and threaded PE joints are not covered elsewhere and some consideration does need to be provided for those circumstances.
In the event of a consensus on the need for preparation of a new IGN (e.g. to address push fit and threaded PE joints) the Standards Board would require the parties involved to form a Task & Finish Group to that end. For further information on how to achieve this contact the Board’s Technical Secretary here.
One or more ‘Common Editorial Caveats’ apply – see ‘WIS & IGN Library / Navigation & Caveats’ for details.