3.05
Schedule 40 PVC pipe shall be connected using industry-grade solvent cement.
Drop pipe shall be secured to the inside of manhole using steel straps or struts. Straps
shall have a minimum width of 1/2 inch and a minimum thickness of 0.03 inch.
Tee and bottom elbow shall be firmly secured by stainless steel straps. Intermediate
straps shall be spaced at a minimum of 5 feet. Straps shall be epoxy-anchored to manhole
using 1/4-inch anchors (two per strap). Anchor shall be embedded into mortar a
minimum of 3 inches. Bottom elbow shall be seated on bench for support.
If a manufactured drop bowl product is used, drop assembly shall be sized and installed in
strict accordance with the manufacturer’s installation instructions and guidelines.
INSPECTION, TESTING, AND ACCEPTANCE:
If any defects are observed, products shall be repaired or replaced at no cost to the Owner
using a method acceptable to the Engineer.
Vacuum testing in accordance with ASTM C1244 shall be required on one randomly-
selected manhole for each group of five manholes rehabilitated with internal liners.
Contractor shall perform vacuum testing with appropriate test equipment in the presence
of an inspector. Any manholes failing this test shall be reworked as necessary and
retested at no additional cost to the Owner. All verification and vacuum testing shall be
at no cost to the Owner and shall be paid for by the Contractor.
Holiday detection testing in accordance with ASTM D4787 shall be required on one
randomly-selected manhole for each group of five manholes rehabilitated with internal
chimney seals or liners. Contractor shall perform holiday detection testing in the
presence of an inspector with test equipment appropriate for the product. All detected
holidays shall be marked and repaired by abrading the coating surface with grit disk paper
or another hand-tooling method. After abrading and cleaning, additional coating shall be
hand-applied to the repair area as needed. All touch-up/repair procedures shall be in
accordance with the coating manufacturer's recommendations. All verification and
holiday detection testing shall be at no cost to the Owner and shall be paid for by the
manufacturer or the Contractor.
Adhesion (Pull-off) testing shall be required on one randomly-selected chimney seal for
each group of ten manholes rehabilitated with internal chimney seals or liners. A portable
pull-off adhesion tester shall be used to achieve substrate failure. Any chimney seals or
liners failing this test shall be reworked as necessary and retested at no additional cost to
the Owner.
2019 CIPP Lining Project Manhole Rehabilitation
Nashua, NH 02800-9
