Introduction

With the Water UK Standards Board’s approval this Information and Guidance Note (IGN) has been drafted by the Sewer Rehabilitation Contact Group, comprising of representatives of the UK Water and Sewerage Companies (WaSCs).

The purpose of this guidance is to provide the UK WaSCs’ specific baseline requirements with regard to gravity sewer rehabilitation using Cured In Place Pipe (CIPP) lining. This guidance does not cover manhole, rising main or siphon rehabilitation or any rehabilitation method other than CIPP lining for gravity sewers.

This IGN describes the minimum standards to be achieved by those engaged in the design and implementation of solutions for the rehabilitation of gravity sewer assets using Cured In Place Pipe (CIPP) technology. The document should apply to all existing assets undergoing rehabilitation using CIPP.

If it is considered that adhering to any part of this document will result in an asset which is not fit for purpose for a particular project or situation, permission should be sought to modify the requirements of this document from the relevant WaSC through its appropriate derogations process.