Planning a Project

When you look at a project that requires lining, do you know what to do to give you and the customer the best job you can provide that solves the problem? Here is a list that needs to be planned out before you can pick out the right material and resin to solve it.

Root Infested Clay Pipe
  • Host Pipe Size (Diameter(s))
  • Section of Pipe Length to Line
  • Type of Pipe
  • Bury Depth
  • Type of Soil Backfilling around the host pipe
  • Access to the Pipe
  • Turns (90’s, 45’s & 22’s)
  • Offset Joints
  • Water Infiltration & Ground Water Depth
  • Missing Sections of Pipe
  • Taps if Any
  • Clean Outs
  • Agency or Municipal Permits if Any
  • The Problem You Are Solving (Roots, etc.)

 Most of these items are obvious as to why you need them, but why do you need to know how deep the pipe is buried and why do you need the type of soil that the original pipe was buried in?  

From an engineering standpoint, you need to design the wall thickness of the pipe to be thick enough to carry the live and dead loads on the pipe that exists due to the weight of the soil and the traffic that may cross the pipe.  The same engineering will want to know what type of support you will get from the existing backfill as part of that calculation.  

From a contractor standpoint, you want to know how deep you have to dig to intercept an access point to line the pipe.  Also from a contractor point, you will want to know if shovels or jackhammers are the required tools to get to the access points of the pipe.  Pipe buried in slurry or sand will require different tools than pipes buried in clay or loam.  

RESIN:  Length, Agency Requirements, and Location of access may determine the resin system you need to use.  Access inside or close to a building may allow some aromatic resins to infiltrate indoors and cause unpleasant odors to drive people out of the building.  An epoxy resin may be best to use in or near buildings that are occupied.  The work/cure time for the resin may be selected based on the length of the run and how much time it will take to mix and get the liner in the ground.  The “wet out” calibration is the slowest part of the process and is accomplished at about 10’ per minute.  For a 100’ run, just calibration will take 10 minutes.  Although doable for a seasoned installer, a 15-minute resin would be pushing the working time limits, suggesting you select a longer work time resin.  If an Agency mandates the use of one of the resins, that mandate may trump your selection of what you’d prefer to work with.  We carry resins that have working times of 15 minutes to 180 minutes to choose from.

 TUBE:  If trying to hit a mark, usually just before the sewer main, you may want to select a tube that minimizes elongation.  If there are turns in the line, you will need to address the cosmetic look of the liner making the turns as it will wrinkle some.  If there are many turns, and wrinkling is not an option, there are several choices of flexible tube that will minimize the wrinkling at the turns. However, there will still be some bunching as the liner makes the turns.  Thickness requirements by the agency may drive the actual tube thickness needed for your particular line.

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