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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<strong>Technology</strong>/Method CIPP/Direct Inversion/Pull -in - Place/Hot Water and Steam Cured<br />
I. <strong>Technology</strong> Background<br />
Status Conventional<br />
Date <strong>of</strong> Introduction 1995<br />
Utilization Rates Install approx. 200 miles <strong>of</strong> liner per year. Have only started pressure pipe<br />
installations in past several years.<br />
Vendor Name(s) National Liner®<br />
National EnviroTech Group<br />
12707 North Freeway, Suite 490<br />
Houston, TX 77060<br />
Phone: 281-874-0111<br />
Email: info@nationalliner.com<br />
Web: www.nationalliner.com<br />
Practitioner(s) Not available.<br />
Description <strong>of</strong> <strong>Main</strong><br />
Features<br />
<strong>Main</strong> Benefits<br />
Claimed<br />
<strong>Main</strong> Limitations<br />
Cited<br />
Applicability<br />
(Underline those that<br />
apply)<br />
National Liner is a CIPP product made <strong>of</strong> a non-woven, needled, polyester felt<br />
that is shop or site impregnated with a thermosetting polyester resin. Vinylester<br />
resins are used <strong>for</strong> pressure applications. A new composite structure,<br />
incorporating glass fiber rein<strong>for</strong>cement, is being developed <strong>for</strong> pressure<br />
applications.<br />
• No-dig (or minimum excavation) renovation.<br />
• Excess resin mechanically locks tube to host pipe by filling in cracks.<br />
• Smooth interior surface <strong>for</strong> improved flow characteristics.<br />
• 7 licensed and trained installation contractors covering US market.<br />
• No ASTM product standard <strong>for</strong> CIPP pressure pipe liners.<br />
• No long-term tensile or pressure regression data <strong>for</strong> pressure applications.<br />
• Limited experience with pressure (<strong>for</strong>ce main) projects.<br />
<strong>Force</strong> <strong>Main</strong> Gravity Sewer Laterals Manholes Appurtenances<br />
Water <strong>Main</strong> Service Lines Other: Storm Sewers<br />
II. <strong>Technology</strong> Parameters<br />
Service Application Gravity and Low Pressure Wastewater<br />
Service Connections Reinstate gravity laterals remotely. No provisions <strong>for</strong> reinstating pressure<br />
connections.<br />
Structural Rating Class II/III – Semi Structural <strong>for</strong> felt, Class IV – Structural <strong>for</strong> glass<br />
Claimed<br />
Materials <strong>of</strong><br />
Non-woven polyester felt material (from Applied Felts) which is saturated with<br />
Composition<br />
either an isophthalic or vinylester polyester resin, depending on application.<br />
<strong>Force</strong> mains use vinylester. A new composite structure that incorporates glass<br />
fiber <strong>for</strong> higher pressure is being developed.<br />
Diameter Range, 6-120 inches<br />
inches<br />
Thickness Range, 4.5 mm to 33.5 mm with felt tube are typical, but greater thickness are possible<br />
inches<br />
Pressure Capacity, psi 50 psi with polyester felt tube, higher with glass fiber composite<br />
Temperature Range, w/PE resin up to 205<br />
o<br />
F<br />
o F; w/VE resins up to 248 o F<br />
Renewal Length, feet Small diameters up to 800 feet; Large diameters up to 2000 feet in one<br />
installation<br />
Other Notes BOH Brothers and Visu-Sewer Clean & Seal both have reported doing sewer<br />
<strong>for</strong>ce mains.<br />
III. <strong>Technology</strong> Design, Installation, and QA/QC In<strong>for</strong>mation<br />
Product Standards ASTM D5813 (Gravity Sewer) – none <strong>for</strong> pressure applications<br />
Design Standards ASTM F1216, Appendix X1, WRc, and standard engineering design using<br />
resources such as RERAU report R4A2-18<br />
Design Life Range 50 years<br />
Installation Standards ASTM F1216, ASTM F1743<br />
Installation<br />
All mains to be cleaned and CCTV inspected be<strong>for</strong>e start <strong>of</strong> lining. The resin<br />
Methodology saturated tube is inverted into the main using a column <strong>of</strong> water or pressurized<br />
A-37
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