TESTS PROVE INSITUFORM LINERS GET EVEN BETTER WITH AGE
Tests by a leading laboratory have confirmed that a sample from a 30 year old Insituform CIPP liner is stronger now than when last tested 10 years ago. The samples were taken from a liner in a 1170mm by 600mm brick egg sewer under Riverside Close in the London borough of Hackney. The sewer, an asset of Thames Water Plc, handles both domestic and industrial waste.
Tests by a leading laboratory have confirmed that a sample from a 30 year old Insituform CIPP liner is stronger now than when last tested 10 years ago. The samples were taken from a liner in a 1170mm by 600mm brick egg sewer under Riverside Close in the London borough of Hackney. The sewer, an asset of Thames Water Plc, handles both domestic and industrial waste.
The liner was a world first when installed in 1971 by CIPP pioneer and Insituform founder Eric Wood. Insituform have now used this treatment to repair over twelve thousand kilometres of sewers, pipework and culverts throughout the world.
The independent tests were done by Bodycote Materials Testing in Bridgwater. The flexural modulus test was conducted using BS EN ISO 178 methods in accordance with UK water industry specification WIS 4-34-04. Test samples were taken from the walls of the sewer in both the one o'clock to three o'clock positions and three o'clock to five o'clock positions so that liner thickness and weight were typical. The results show that the strength of these samples exceeded the specification by 50 percent.
"Real world experience mirrors scientific findings," explained Insituform managing director Jon Newton. "We have done extensive accelerated life testing at Louisiana Tech University in the USA that show our liner should exceed 50 years of service under normal use - the JCB's can stay away from Riverside Close until some time after 2021 and perhaps much longer."
Insituform invests more than 2 million each year in research and development to stay at the front of no-dig technology. CIPP products are available to line sewers from 100mm to 2000mm diameter. There are special resins for harsh effluents while reinforced liners are available for pressure applications and the rehabilitation of totally deteriorated sewers.
The company also invests in the development of robotic survey and cutting devices and was the first to develop and use the controlled head inversion (CHIP) system for sewers where gravity inversion is not possible. Insituform also offers Thermopipe a pre formed flexible liner for the high speed refurbishment of pressure mains, including potable supply.
More information:
Mark Neal, Insituform Technologies Ltd, Tel. 01924 277076 Fax. 01924 265107
E-mail: mneal@insituform.com Web: www.insituform.com
Low and high resolution pictures for this text are on the web at www.ainsmag.co.uk/in198/3262in1a.htm
August 23, 2002
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