Solutions For Lateral Rehab

By Jeff Griffin, Senior Editor | October 2010 Vol. 65 No. 10

Preparation includes measuring and cutting the felt tube liner to the specified length. The proper epoxy resins for the job are combined with specific hardeners with “pot lives” ranging from 15 to 180 minutes. A max vac pump is used to remove all air from the felt liner to assure complete resin impregnation, and the impregnated felt is fed through a calibration roller to ensure even distribution of epoxy resins throughout the tube.

The impregnated liner then is inverted into the lateral and cured. Following the curing process, any side entrances to the repaired pipe are reopened and openings at each end are finished.

“The most critical piece of equipment is the liner gun which inverts the liner into the existing pipe,” said Carroll. “But we recommend a complete system. The MaxLiner system includes the gun, calibration rollers, max vac pump, mobile hot box heating unit to speed curing time, control box to maintain even air pressure through curing and cutting tool to reinstate service of newly lined and cured pipe.”

When sealing lateral connections, the process begins inside the main line where it is launched and then continues out into the lateral for seamless installation of 30 or more continuous feet of cured-in-place pipe.

In addition, MaxLiner offers a self-contained trailer providing a mobile CIPP unit that adheres to ASTM F1216 for lateral relining.

Time to complete a lining depends on length, diameter and condition of the pipe.

“Assuming a 40-foot, four- to six-inch diameter pipe, the entire process can be completed in just a few hours,” Carroll said. “With our system, installers typically complete two, three or more relining jobs each day. The flexibility of the materials used, portability of the equipment, and the ease of use make CIPP lateral lining systems extremely adaptable and user-friendly in a variety of pipe conditions, weather patterns and soil types.”

Pipebursting
Pipebursting is a well established trenchless method of installing new pipe to replace old, deteriorating laterals. The process involves pulling a bursting tool through the old pipe, cracking or bursting it into pieces while pulling in a new length of pipe behind it.

A major benefit of using the pipebursting process is the capability of upsizing new pipe -- how much pipe size can be increased depends on soil conditions.

While pipebursting is included in the “trenchless” category, it does require excavations for starting and receiving pits.