Structural “pipe-in-pipe” principle
CIPP involves installing a resin-impregnated liner that, once cured, forms a continuous structural pipe within the existing one.
Materials and mechanical behavior
Liners can be made of felt or fiberglass, with fiberglass typically used for structural applications due to higher strength.
Pipe preparation
Proper cleaning and removal of obstructions are essential to ensure liner performance.
Installation control
Pressure, positioning, and liner expansion must be carefully controlled to ensure uniform contact.
Curing process
Heat, steam, or UV curing must be precisely controlled to achieve full resin polymerization.
Limitations
CIPP does not correct major misalignments or collapsed sections and follows the existing pipe geometry.
Conclusion
CIPP is a high-performance structural solution when properly designed and executed, requiring accurate diagnosis and controlled application.
