Constructability and structural thickness design are not the only design considerations.
When project applications exceed the scope of the industry consensus standards and codes, the responsible parties have a professional duty to independently validate the applicability for use with informed consent from all parties.
Competing failure mechanisms that must be considered in design include corrosion, temperature, abrasion, shear, impact, and strain to failure resistance. The consensus standards' scope only qualifies products for typical municipal utility sewer exposure conditions.
Not all epoxies are the same.
Higher grades with different chemical backbones, such as novolac epoxies, cross-link more densely, offering greater corrosion resistance. By staging the cure up to higher temperatures, novolac epoxies can also achieve higher temperature resistance.
However, with novolac epoxies, some of the flexibility of a utility sewer-grade bisphenol A epoxy is sacrificed, and the greater brittleness to impact loads must be considered for the application (shallow burials with live loading will require closer scrutiny).
While not as routinely available, many process piping applications benefit from the higher temperature and corrosion resistance of specialty epoxy liners using premium resin backbones.
The specialty high-temperature and acid-resistant epoxies and the broad-spectrum chemical resistance of many of the UV-cured vinyl ester resins are generally much better suited to aggressive commercial and industrial applications than typical residential sewer-grade CIPP liners.
The premium price of premium-grade resins is generally justified in mission-critical industrial and commercial applications.
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