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

For pressure applications, a hydrostatic pressure test is suggested for twice the working pressure or
working pressure plus 50 psi (3.5 bar), whichever is less. The allowable leakage rate over the one-hour
test is 20 gallon/inch diameter/mile/day.
Table 5-13. Minimum Structural Properties of CIPP Products by ASTM F1216
Property Test Method
Minimum Value
psi
Flexural Strength D790 4,500
Flexural Modulus D790 250,000
Tensile Strength
(pressure pipe only)
D638 3,000
ASTM F1743
This process may be used in a variety of gravity and pressure applications. CIPP products conforming to
ASTM D5813 would be installed following this standard practice. An outer impermeable plastic coating
may optionally be perforated to allow resin to be forced through and out against the existing pipe wall
during the calibration with pressure. The minimum initial physical properties of the CIPP product are
presented in Table 5-14. This practice also contains a chemical resistance requirement. On a
qualification basis, the cured resin/fabric tube matrix must retain 80% of its flexural modulus after one
year exposure at 73.4 o F to five different reagents. The exposure is not under a strained condition.
Recommended inspection practices includes obtaining at least three, and preferably five, samples of the
CIPP taken at either intermediate manholes, or termination points, or fabricated from material placed and
cured in a clamped mold. In addition to testing for the flexural properties, for pressure applications,
tensile testing is also required. If the CIPP is fiber reinforced with oriented or discontinuous fibers, then
tensile testing in both the axial and circumferential direction is recommended. Pressure pipes should be
subjected to a hydrostatic pressure test of twice the working pressure, or working pressure plus 50 psi (3.5
bar), whichever is less. If required by the purchaser, a delamination test in accordance to D903 is also to
be made.
Table 5-14. Minimum Structural Properties of CIPP Products by ASTM F1743
Property Test Method
Minimum Value
psi
Flexural Strength D790 4,500
Flexural Modulus D790 250,000
Tensile Strength
(pressure pipe only)
D638 3,000
ASTM F2019
The reconstruction process can be either for gravity flow or pressure applications. CIPP liners meeting
ASTM D5813 would be installed under this practice. Isophthalic polyester, vinylester, or epoxy
thermosetting resins may be used. For cleaning of the line for pressure applications, cable attached
devices or fluid propelled pigs are recommended. After CCTV inspection and cleaning, a sliding plastic
foil is first installed covering the lower third of the circumference to reduce friction and damage to the
CIPP liner. After insertion, the calibration hose is inflated and the liner cured. The calibration hose is
removed after cure. As in all of the CIPP standard practices for acceptance, samples of the CIPP liner are
either cut from a section at an intermediate manhole or at a termination point of like diameter section, or
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