This educational webinar is hosted by ISTT. The live session is open to non-members, but archived videos will be accessible only to members. Members can download the presentation files at no cost, while non-members can purchase them on our website.
ASTEE Recommendations for the Design of Pressure Pipe Liners
Olivier Thépot
Thomas le Floc’h
Expert & Development Engineer, Water Dept, Scientific and Technical Center for Building (CSTB), France
22nd May 2025, 14:00 -15:00 GMT
The ASTEE working group for the rehabilitation of pipelines published in 2014 a calculation method for gravity pipe liners, known as 3R2014. This method was subsequently improved and republished in MOP 145 by the ASCE in the United States. Based on this success, the working group decided to develop a dimensioning method for pressure pipe liners, utilizing the latest research and experiments conducted primarily in Canada at Queen's University. This new method adheres to the principles of limit state calculation, also known as Load and Resistance Factor Design (LRFD).
The method involves the verification of eight limit states, which represent possible modes of failure. During the webinar, we will present these limit states, three of which specifically address the longitudinal resistance of the liner. These include the effects of differential settlement (LS6) and seismic wave impact (LS7), which are not considered in the ASTM F1216 method. It is important to note that this new method is not based on the AWWA qualitative structural classification outlined in the M28 manual, which presents certain challenges that we will discuss in detail during the webinar, particularly how to translate them into equations.
About Olivier Thépot
Dr Olivier Thépot graduated from the Ecole Nationale des Ponts et Chaussées (France) with a PhD in Geotechnical Engineering. He worked at Eau de Paris (the Paris water public operator) in the engineering department as a scientific expert. He has over 30 years of experience in the diagnosis of underground pipes and the design of structural rehabilitations. He has published numerous papers on liner design. He has been actively involved in elaborating on the French design method for rehabilitating gravity pipes – the ASTEE 3R2014 Recommendations. He was also a member of the Blue Ribbon panel reviewers of the New ASCE Manual of Practice N°145 for the design of Close-fit Liners for Gravity pipes. He is a member of the French Scientific and Technical Association for Water and Environment (ASTEE), where he co-leads the working group on the rehabilitation of sanitation
networks.
About Thomas LE FLOCH
Thomas LE FLOCH is a French chemical engineer who specializes in the field of water and sanitation management. He worked for 14 years at the Scientific and Technical Building Center (CSTB), a French public company for which he carries out expert missions in the field of public networks and wastewater processes. He is specifically in charge of the public network’s rehabilitation services and support at CSTB, including the NF390 certification, a French certification, which manages companies working in the field of rehabilitation. He co-leads the ASTEE working group in rehabilitation techniques with Olivier. He was previously in charge of the laboratory that specialized in this field.