State of Technology Report for Force Main Rehabilitation, Final ...

Technology/Method PE Liner/ Cement Mortar Bonded Interactive Composite Liner
Composition
Diameter Range, inches 4 inches to 12 inches
Thickness Range, inches Approximately 3/16 inches (3.0 mm). However, grout will often be thicker where
it is filling pipe defects.
Pressure Capacity, psi Max. hole size of 2.4 inches or gap of 0.4 inches with pressure up to 294 psi (20
bar)
Temperature Range, o F Min. 37 o F during installation
Renewal Length, feet Approximately 500 feet
Other Notes All installed materials are ANSI/NSF 61 certified for contact with potable water.
Cathodic protection can be restored to ferrous pipes to retard external corrosion.
III. Technology Design, Installation, and QA/QC Information
Product Standards NSF 61 listed
Design Standards None cited.
Design Life Range If properly installed, a 50+ year design life for the liner would be reasonable.
Installation Standards None cited.
Installation Methodology Main must be thoroughly cleaned and CCTV inspected. Robotically plug any
open service connections where unwanted grout may migrate. Tube liner is
winched into main. At end where grout is to be introduced, fit grout injection
fitting to main. Trim other end of liner and install tensioning and anti-twist
assembly. Grout slug is pumped into the grout fitting and the rounding swab is
advanced down length of lining run to distribute the mortar around the outside of
the liner. The liner is held under very low air pressure in order to allow the grout
to hydrate for up to 16 hours. Once the grout is hydrated, the lining is inspected
using CCTV and infrared thermography. MainSaver’s RoboTap is used to
remotely, robotically reinstate the service connections, and PE end seals are
installed to protect the new liner as it is returned to service. The pipe is
disinfected (if potable water).
QA/QC MainSaver/W.S.U.’s Quality Management System is certified to ISO 9001:2000
for the Custom Manufacture of NSF Standard 61 Extruded Tape and In-situ
Remediation of Potable Water Lines. The host main is cleaned and CCTV
inspected prior to lining, and post-lining the installation is CCTV and IRTV
(infrared) inspected to verify grout distribution behind the liner.
IV. Operation and Maintenance Requirements
O&M Needs No special maintenance needs. PE liner is smooth and should maintain low
frictional resistance.
Repair Requirements for If a lined section needs to be repaired, the MainSaver composite liner can be cut
Rehabilitated Sections out with the damaged pipe section and conventionally patched with a spool piece.
V. Costs
Key Cost Factors Set up costs (key cost drivers) are generally dependent upon mobilization
logistics, traffic control requirements, trench backfilling requirements, and asphalt
and concrete replacement. Material costs are constant. The main variable is the
amount of material required.
Case Study Costs MainSaver’s installation costs are competitive with cement mortar lining, less
expensive than CIPP rehabilitation, and less expensive than conventional pipeline
replacement.
VI. Data Sources
References MainSaver Web site and brochure. MainSaver will provide third party test data
and results to interested parties upon request.
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