Curing Methods

The curing profile of each liner utilizes a delicate balance of resin catalyst level, curing temperature and time of exposure to maximize the installed physical properties.

After the inversion is completed, a suitable heat or UV light source is required to cure the pipe liner.

Storm Water

For traditional felt tube cured-in-place pipe projects, the equipment should be capable of delivering hot water or steam throughout the section to uniformly raise the water or steam temperature above the temperature required to affect a cure of the resin. The temperature profile is closely monitored in accordance with Inliner's patented heating methods to produce the optimum installed physical properties. The decision to cure a liner with hot water or steam is based upon many factors, most importantly the liner thickness, length and project site geometry.

 In the UV curing process, a mechanical string of lights, familiarly referred to as the light train, is moved through the liner at a controlled rate of speed. The liner is pressurized with air to ensure total expansion of the product during the curing process.

Unless otherwise specified by the owner, our technicians are trained to evaluate the project parameters and apply the curing methodology that best suits that particular application. The following lists some of the pros and cons for each method of curing.

 

WATER CURING

STEAM CURING

  • Historically proven method
  • Ability to address sags/standing water
  • One uniform temperature throughout pipe
  • Accommodates long lengths/large diameters
  • Less time to complete curing
  • Higher degree of cure = higher properties
  • Allows for steep slope installations
  • Limited water supply and access required
  • Consumption of Water to inflate/cure
  • Height access for inversion towers
  • Steep slope limit due to weight of water
  • Safety considerations of steam use
  • Length and thickness limitations
  • Potential of coating to blister from heat
 


UV CURING

 


  • Glass fiber allows for reduced laminate thicknesses
  • Accommodates both polyester and vinylester
    resins
  • Styrene barriers minimize environmental impact
  • Shelf life up to six months; no refrigeration
  • Ability to view liner before it is cured


 
  • Size limitation of 6-48"
  • Typically slightly higher cost compared to felt CIPP
  • Minimal expansion capability for abnormal pipes