Report No FR0472

Nov 1994

I BENEFITS

This work is part of a project to develop a Water Industry Specification for epoxy resin lining materials. Such a specification would provide a framework for assessing the fitness for purpose of in situ epoxy resin linings for the internal corrosion protection of water mains. The specification could be incorporated into accredited quality systems and specified in contract documentation; it could also form the basis of a European specification. The draft specification is provided in Appendix A.

The review and development of appropriate performance tests has provided a better understanding of the corrosion inhibiting and adhesion properties (hence lifetime) of in situ applied epoxy resins.

II OBJECTIVES

To develop a performance specification for approved in situ epoxy resin linings for water mains.

To gain a greater understanding of the properties of such linings.

III REASONS

Despite widespread use of in situ epoxy resin lining for internal renovation of water mains, there is no performance specification and consequently no standard method for assessing the fitness for purpose of such linings.

IV RESUME

Various tests were carried out to find out how useful they would be if included in a specification. This report details how the tests were carried out, gives the results, and discusses how they might be used.

V CONCLUSIONS

In general, the linings performed well in the various tests, indicating that they are likely to have a satisfactory lifetime in service.

VI RECOMMENDATIONS

There should be a test for susceptibility to blistering, and an accelerated corrosion test, in the specification.

The durability tests should be continued to give greater confidence in the results.

Copies of the report are available from FWR, price £15.00, less 20% to FWR Members.