The use of cement mortar and, more recently, epoxy resin materials for in situ lining of potable
water mains has increased in the United Kingdom (UK) to a point were they are valuable tools in many water
utilities rehabilitation programs. Epoxy resins have a demonstrable track record providing a thin, smooth coating with
excellent carrying capacity and proven durability. The main limitation of these materials is
the extended cure period of 16 hours before return to service which results in a 36 hour
period in the UK when customers are without water and in North America the need to lay
rider mains and temporary supplies to each property. A number of manufacturers have been working on the development of rapid setting products
based on polyurethanes, polyureas and other isocyanate cured materials and one manufacturer
now has a fully approved lining material. This product has a gel time of 30 seconds, can be
closed circuit television (CCTV) surveyed in 30 minutes and may be chlorinated and returned to service after 2 hours.
This paper describes the material and its application, outlines the requirements for lining rig
design and associated ancillary equipment and details some of the requirements for quality
assurance and accreditation of contractors. The perceived benefits of rapid setting polymeric
linings are discussed. Includes 7 references, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 450 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 01/01/2000 |
