NASTT-NW Sep Technical Luncheon

Applying ASCE MOP 145 to Gravity CIPP Lining Projects

For decades, the trenchless rehabilitation industry has relied on ASTM F1216 as the primary design and specification reference for Cured-in-Place Pipe (CIPP) rehabilitation of gravity sewers in North America. However, after a newer structural design framework (i.e., ASCE MOP 145) was introduced in 2021, questions are emerging about whether the traditional F1216 approach remains sufficient for modern rehabilitation challenges. While ASTM F1216 provides a straightforward and familiar design method, it was originally developed for relatively ideal conditions and does not fully address challenges such as pipe geometry, large deformations, significant defects, or variability in liner material properties. ASCE MOP 145 introduces a Load and Resistance Factor Design (LRFD) methodology that accounts for uncertainties in loads, material performance, and installation conditions. This approach allows more robust liner designs while improving alignment between engineering expectations and contractor means and methods. This presentation will walk through the procedural steps of both F1216 and MOP 145. Project examples and design comparisons will illustrate how both approaches can be applied to support informed specification and the long-term performance of gravity sewer rehabilitation projects.

Bio

Kay is a Senior Trenchless Engineer at Stantec with technical expertise in structural design, geotechnical assessment, pipeline design, rehabilitation, and condition assessment. He is a registered professional engineer in Alberta & Ontario, and has worked on a wide range of trenchless projects across Canada and the US. Kay earned his PhD from the University of Waterloo and is very passionate about advancing the trenchless industry. He is actively involved in professional organizations through committees such as NASTT Northwest Planning Committee, CUIIC Geotechnical Committee, and Standards development Task Groups for both AWWA C623 CIPP Pressure Pipe Design Appendix and ASTM F3182 Spray-Applied Polymeric Liner Design.