Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...
Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...
Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
methods are detailed <strong>in</strong> the Guide to <strong>Pipe</strong>l<strong>in</strong>e Rehabilitation developed by the Japan Institute <strong>of</strong><br />
Wastewater Technology (JIWET), published by JSWA <strong>in</strong> English and Japanese <strong>in</strong> June 2001. The guide<br />
has just been revised and expanded by JIWET to <strong>in</strong>clude site management and quality assurance<br />
measures. It was published <strong>in</strong> Japanese only by JSWA <strong>in</strong> June 2007.<br />
In the period 1988-2006, renovation by repair us<strong>in</strong>g res<strong>in</strong> <strong>in</strong>jection and rehabilitation us<strong>in</strong>g hose l<strong>in</strong><strong>in</strong>g,<br />
fold-and-form, and spiral pipe renewal (SPR) methods grew rapidly (see Figure 8-3). Sewer ma<strong>in</strong>tenance<br />
is funded solely from local government funds. Network rehabilitation has been grow<strong>in</strong>g steadily s<strong>in</strong>ce<br />
1986 and is currently undertaken at a rate <strong>of</strong> almost 500 km per annum. Information obta<strong>in</strong>ed from the<br />
Japan <strong>Pipe</strong> Rehabilitation Quality Assurance Association (JPRQAA) is <strong>in</strong>dicated below for the period<br />
1986 to 2009. Almost 4,800 km <strong>of</strong> sewer have been renovated by <strong>in</strong>version (1,994 km), pull-<strong>in</strong>-and<strong>in</strong>flate<br />
(2,051 km), and spiral wound methods (745 km). The figures for the pull-<strong>in</strong>-and-<strong>in</strong>flate method<br />
<strong>in</strong>clude both UV and steam cured CIPP and fold-and-form methods (Ex<strong>Pipe</strong> and Omega <strong>Pipe</strong>).<br />
Figure 8-3. Annual Rehabilitation Construction 1986-2009<br />
CIPP was <strong>in</strong>troduced <strong>in</strong>to Japan by Insituform under license to l<strong>in</strong>e H2S corroded sewers under the New<br />
Tokyo International Airport <strong>in</strong> 1986. Hose l<strong>in</strong><strong>in</strong>g systems, Paltem and Phoenix developed <strong>in</strong> Japan for<br />
gas pipe rehabilitation were applied to sewer rehabilitation <strong>in</strong> 1988 and spiral wound pipe was imported<br />
from Australia and adopted by Sekisui <strong>in</strong> 1989. The Omega fold-and-form system developed by Sekisui<br />
was launched <strong>in</strong> 2009 and the In<strong>Pipe</strong> UV light cur<strong>in</strong>g CIPP was adopted <strong>in</strong> 1991. The annual<br />
rehabilitation volume grew rapidly from 50 km/year <strong>in</strong> 1991 to 200 km/year <strong>in</strong> 1999. In the early years,<br />
the preferred method was CIPP <strong>in</strong>stalled by <strong>in</strong>version but, by 2005, <strong>in</strong>stallation by pull-<strong>in</strong>-and-<strong>in</strong>flate<br />
methods (both CIPP and fold-and-form) took 50% <strong>of</strong> the market and these are now be<strong>in</strong>g used for 60% <strong>of</strong><br />
rehabilitation works. Currently, spiral wound pipe takes 20% <strong>of</strong> the market with 60% <strong>of</strong> that volume <strong>in</strong><br />
diameters over 800 mm. In 2009, the methods used were broken down by method and diameter as shown<br />
<strong>in</strong> Figure 8-4.<br />
121