State of Technology Report for Force Main Rehabilitation, Final ...
State of Technology Report for Force Main Rehabilitation, Final ...
State of Technology Report for Force Main Rehabilitation, Final ...
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to Brandenburger. The product is called Blue-Tec in Germany, Eco CIPP in the UK and UV CIPP in<br />
some other countries. Blue-Tek is primarily marketed <strong>for</strong> gravity sewer applications. Blue-Tek does not<br />
have NSF 61 certification, so it’s not suitable <strong>for</strong> potable water applications. Application <strong>for</strong> NSF 61 is<br />
being considered <strong>for</strong> the future. Blue-Tek is a glass rein<strong>for</strong>ced CIPP liner that is UV-cured. The liner<br />
strength stems from a seamless, spirally wound glass fiber tube that is impregnated with polyester (ortho)<br />
or vinylester resins. All wet out is per<strong>for</strong>med in the Saltville plant. The seamless liner has an inner and<br />
outer film, with the outer film blocking UV light. Care is needed to ensure the outer film is not damaged<br />
during installation. The inner film is removed after curing. The glass rein<strong>for</strong>cement used is Owens<br />
Corning’s Advantex ® EC-R glass, which is a highly acid resistant glass fiber. Blue-Tek is available in<br />
diameters from 6 to 48 inches (150 to 1,200 mm) and can be used in circular, oval, and egg-shaped pipes.<br />
Reline America reports that liners up to 60 inches (1,500 mm) will be available in the near future. The<br />
short-term flexural modulus is 1.1×10 6 psi (7.6 x 10 4 bar), with increases to 2.16×10 6 psi (14.9 x 10 4 bar)<br />
possible. For long-term modulus, a reduction factor <strong>of</strong> 1.6 is used. The short-term tensile strength is<br />
reported to be 20,000 to 26,000 psi (1,379 to 1,793 bar). No long-term test data are available which limits<br />
the Blue-Tek liner to semi-structural applications. The product con<strong>for</strong>ms to ASTM F2019 and would be<br />
designed in accordance to ASTM F1216, Appendix X1. Renewal lengths <strong>of</strong> up to 1,000 feet (305 meters)<br />
are achievable. Blue-Tek is winched into the existing pipe and inflated with air pressure (6 to 8 psi [0.4 to<br />
0.55 bar]) and then cured using a UV light train. Reline America promotes its Quality-Tracker System<br />
<strong>for</strong> tracking the entire curing process (seven steps) with a data logger and retrieval system. In addition to<br />
CCTV inspection <strong>of</strong> the line be<strong>for</strong>e and after curing, a record <strong>of</strong> the liner’s inner air pressure during<br />
curing, the curing speed (feet/min), and resin reaction temperatures (infrared sensors) are all monitored.<br />
Reline America claims that minimal styrene is released into the environment with their process.<br />
Insitu<strong>Main</strong> by Insitu<strong>for</strong>m Blue<br />
In 2009, Insitu<strong>for</strong>m introduced its latest addition to their CIPP product line referred to as Insitu<strong>Main</strong>.<br />
Insitu<strong>Main</strong> is a fully structural Class IV CIPP liner that has an NSF 61 certification and is suitable <strong>for</strong><br />
both potable and non-potable pressure applications, including sewer <strong>for</strong>ce mains. Insitu<strong>Main</strong> is available<br />
in nominal diameters <strong>of</strong> 6 to 36 inches (150 to 900 mm) and <strong>for</strong> pressures up to 150 psi (10 bar). The<br />
Insitu<strong>Main</strong> system has a polyethylene layer on the inside pipe surface that increases the pipe's<br />
smoothness, reduces surface friction, minimizes reduction in flow, and provides an additional corrosion<br />
barrier <strong>for</strong> the pipe. It is composed <strong>of</strong> an epoxy composite layer, which is rein<strong>for</strong>ced with glass and/or<br />
polyester fiber materials (depending on a number <strong>of</strong> design elements including the host pipe diameter and<br />
internal pressure requirements). The Insitu<strong>Main</strong> product is saturated with epoxy resin, either on the job<br />
site or in an authorized wet out facility, inserted into the host pipe either by inversion or by pulling-in, and<br />
cured with either hot water or steam. The Insitu<strong>Main</strong> system, which adheres to the host pipe, provides a<br />
continuous, structural pipe. Because the liner does adhere to the host pipe, special fittings to seal the ends<br />
are not required.<br />
3.4.5 Woven Hose Lining System. Woven hose linings differ from ordinary CIPP products by the<br />
construction <strong>of</strong> the tube rein<strong>for</strong>cement. Rather than being made <strong>of</strong> a felt type material, hose liners are<br />
made from either polyester, glass, or aramid fibers that are woven into a hose-type configuration, similar<br />
to the type <strong>of</strong> construction used <strong>for</strong> fire hoses. The weaving pattern can be varied to give different<br />
properties in the circumferential and axial direction. Typically, hose liners are pulled into place rather<br />
than installed by inversion as they have relatively high axial strength. Three types <strong>of</strong> woven hose lining<br />
systems are discussed below including adhesive-backed linings, non-adhesive backed linings, and glassrein<strong>for</strong>ced<br />
thermoplastic linings. It is also noted whether or not the lining system is semi-structural or<br />
structural in nature.<br />
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