of the conduit specified. An allowance shall be made for changes in circumference
of the conduit by free overlap during inflation of the tube.
b. The minimum length shall be determined to effectively span the designated defective
section, plus one foot at either end. The lengths shall be verified in the field before
pulling the tube into the pipe.
c. The thickness of the pipe within a pipe shall be designed to conform to actual field
conditions.
d. Physical Properties: The cured repair material shall conform to the following
structural standards:
Flexural Modulus of Elasticity 1,200,000 psi
6. Preparatory Procedures:
The following procedures shall be adhered to unless otherwise approved.
a. Safety:
Safety shall be in strict accordance with all applicable OSHA standards. Particular attention is
drawn to those safety requirements involving entry into a confined space.
b. Flow Control:
As required for acceptable completion of installation, the sewage flow maintenance around the
sections of pipe designated for rehabilitation shall be carried out. The bypass shall be made by
plugging the line at a point upstream of the pipe to be rehabilitated and pumping the flow to a
downstream point of adjacent system. The pump and bypass lines shall be of adequate capacity
and size to handle the flow specified in the job specifications. When necessary, any bypass
pumping shall be arranged to prevent any backflow in the sewer system.
c. Cleaning:
Cleaning of the sewer pipe shall be carried out immediately before TV inspection.
d. TV Inspection:
TV inspection of the sewer pipe shall be carried out immediately before insertion of the tube
to ensure that the sewer is clean and that the pipe conditions have not changed.
7. Installation Procedures:
The process of installing a repair using the system involves the following steps:
a. Inspect fault in conduit using closed circuit television (CCTV) and record detail.
Estimate dimensions of fault and length of repair required. Wherever possible, flow
through a conduit should be interrupted during inspection and cleaning.
b. Clean conduit by whatever method is deemed suitable for the type of deposits /
debris encountered and condition of the conduit. High pressure water jet cleaning is
normally most effective.
c. Reinspect conduit using CCTV
d. Prepare epoxy resin and fiber glass and carbon fiber cloth using pre-measured kits.
The pot life of the resin can be adjusted and supplied to suit the ambient temperature
of the site. The resin can also be cured with steam.
02650A - 2
