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

Technology/Method Fold -and - Form/Thermoformed
• Relatively small job site footprint. Most equipment can be parked away
Main Limitations
Cited
Applicability
(Underline those that
apply)
from the insertion access if necessary.
• Materials are NSF 61 approved, but system has yet to be listed for use in
potable water lines; listing is planned to be pursued in the future.
• Limited long-term pressure test data to support independent use as a fully
structural liner in pressure applications; available data supplemented by 10
years of practical field application.
• Requires access at both ends of the pipe for installation.
• Requires excavation for a pressure seal at branch connections.
• All tight-fitting liners require additional technologies (grout packing, lateral
lining, or other) to provide a seal at internal branch connections.
• Elevated temperatures lower the modulus of thermoplastics like PVC alloys,
thus modulus adjustments should be considered within the structural
equations when the application is significantly above routine wastewater
flow temperatures.
• Construction network is small scale which limits available economies of
scale and influences potential competitiveness on larger scale projects
(particularly 30,000 linear feet +).
• Not currently available in most major metros. This is subject to change with
coverage expansion.
Force Main Gravity Sewer Laterals Manholes Appurtenances
Water Main Service Lines Other: Culverts, Industrial, Water Intake
II. Technology Parameters
Service Application Wastewater, storm water, raw water, industrial, power
Service Connections Laterals remotely reinstated with robots. Down time 5 hours plus time to
Structural Rating
Claimed
reinstate laterals. Sewer main flow typically disrupted for 3 to 4 hours.
Fully structural, independent liner. Flexural modulus available as 145,000 psi
(F1871) or 280,000 psi (F1504), and flexural strength as 4,100 psi (F1871) or
5,000 psi (F1504). Design is determined by industry standard equations with
material properties adjusted for long-term performance under load.
Virgin PVC alloy compound (impact modified, no fillers, NSF approved)
Materials of
Composition
Diameter Range, 4 to 30 inches – F1504 only to 16 inches
inches
Thickness Range, 4 inches – DR 32.5, 6, 8, 9 inches – DR 32.5 to 35, 10, 12, 15, 16 inches – DR
inches
32.5 to 41, 18 inches – DR 35 to 50, 21, 24, 30 inches – generally designated by
wall thickness up to 0.65 inches
Pressure Capacity, psi Currently available for low pressure, under 80 psi (only available up to 15 inches
diameter pipe). Design methodologies are still being researched, with no
available standards. Have completed one “experimental” 150 psi project.
Temperature Range, o F 100 o F (continuous) for F1871; 120 o F for F1504; intermittent and diluted flows at
higher temps may be acceptable. Under sustained elevated temperatures, the
design modulus needs to be adjusted for structural calculations.
Renewal Length, feet Up to 600 feet typical; 1,000 feet for 8 to 12 inches has been achieved, and up to
650 feet for 21 inches and 24 inches, up to 500 feet for 30 inches
Other Notes Minimal to no loss of flow capacity expected; flow velocity increases can be
significant. No noxious or toxic chemicals (NSF potable water and FDA food
contact safe materials). Safe for use in environmentally sensitive applications.
Has evidenced comparable I/I control to competitive alternatives in field
applications.
III. Technology Design, Installation, and QA/QC Information
Product Standards ASTM F-1871 Standard Specification for Folded/Formed Poly (Vinyl Chloride)
Pipe Type A for Existing Sewer and Conduit Rehabilitation
ASTM F-1504 Standard Specification for Folded Poly (Vinyl Chloride) (PVC)
Pipe for Existing Sewer and Conduit Rehabilitation
Design Standards Appendix within ASTM installation standard F1867 and F1947 is the same as
that within ASTM F1216 for CIPP products.
A-23