Past Webinars

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2023-02-15 Webinar

An Overview of Deterioration Mechanisms and Leakage Detection Techniques in Plastic Pipelines

Category: Condition Assessment

Presenter: Dr. Kalyan Piratla
Date: 15 February 2023
Organization: Clemson University

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This webinar is open to Non-Members now (no fee required). Recorded videos and Presentation files are for ISTT members only (after member login). Updated on 13 Feb 2023.

Plastic pipe material is increasingly used for several applications including water, sewer, and gas. Plastic pipelines currently in service are not as old as the metallic pipelines, but there have been many seemingly premature failures warranting a comprehensive understanding of their failure mechanisms and how to keep track of them for appropriate intervention. Further, many condition assessment - specifically leakage detection - techniques that are suitable for metallic pipelines are not suitable for plastic. This presentation provides an overview of the deterioration mechanisms for plastic pipelines informed by the state-of-the-art literature. Additionally, it presents research insights into leakage detection in plastic pipelines. There have been numerous papers published on various aspects of plastic pipe degradation and leakage detection in multiple utility sectors, and this presentation synthesizes the most crucial knowledge out there for practical reference.


About Dr. Kalyan Piratla

Dr. Kalyan Piratla is an Associate Professor of Civil Engineering at Clemson University. His research work is focused on resilient planning and asset management aspects of buried pipeline infrastructure. He authored numerous peer-reviewed research articles and was recognized with awards such as the ASCE's Arthur M. Wellington prize, NASTT's Ralston Young Trenchless Achievement award, and Clemson University's Liles Professorship



2022-06-30 Webinar

Soil friction and interaction during Microtunneling

Category: Microtunneling

Presenter: Wout Broere
Date: 30 June 2022
Organization: Delft University of Technology, The Netherlands

The friction forces on tunnel segments during pipe jacking determine to a large extent the capacity of the jacks and the number of intermediate jacking stations. Experience shows significant differences between predicted and actual friction forces. In this presentation we will look into the different factors that contribute to the overall soil friction and lead to the differences between design approaches and actual field experiences.

One of the major contributing factors to the overall friction is the boring of curves. To better understand the behaviour of the tunnel boring machine in curved alignments, a model has been developed, that takes the subgrade reaction and the stiffness of the soil into account. The subgrade reaction in the inner and outer curve of the TBM differs substantially and a reduction factor is introduced to deal with this effect. Especially in soft soils the impact of curved drives can be significant, and this will be illustrated by detailed measurements from several pipe jacking project in soft soil conditions.



◆About Wout Broere

Dr. Wout Broere is a professor of Underground Space Technology at Delft University of Technology, a board member for the Netherlands Society for Trenchless Technologies as well as a Fellow of the ISTT. His research interests range from trenchless technologies, large diameter tunnelling and the use of underground space to site investigation, physical modelling and offshore foundation engineering. He has extensively published on these topics and is currently editor-in-chief for the journal of Tunnelling and Underground Space Technology (incorporating Trenchless Technology Research).


2022-04-28 Webinar

CIPP rehabilitation. Material and performance

Category: Rehabilitation

Presenter: Jan Borje Persson
Date: 28 April 2022
Organization: JBP Composites S.L.

Since its introduction in the early 1970s CIPP has been one of the most frequently used trenchless technologies for rehabilitation of gravity pipe networks, and subsequently for pressurized pipes as well. From the early years, synthetic fibers were the material used as a carrier to the resin, in the manufacturing stage, until the uncured liner was installed and cured. The technical performance of the cured liner was dependent, in large part on the resin used.

During the 1980s a number of companies started to use more advanced materials which led to birth of reinforced CIPP. Material and the design of CIPP liners in both gravity and pressure applications have progressed especially during the last 20 years. Today we see structural CIPP applications in a large range of diameters and pipe shapes in many countries across the globe.

This webinar will look retrospectively at the development of both gravity and pressure CIPP applications, to give the audience an informed view as to what technical degree the technology for CIPP has evolved, in terms of materials, design and application technology, to achieve final pipe performance in meeting today’s requirements and relevant standards.

CIPP materials and Performance


About Jan Borje Persson

After graduating as a computer hardware engineer in 1981, shortly afterward I began working in the thermoplastic industry while continuing studies in rubber and plastic at Lulea University. In 1985 I started to work with the technical development of the very first commercially produced UV cured fiberglass-reinforced liner system, for a Swedish-based company where I remained as a technical director and shareholder until 1999. Since 2004, I have founded and remain the major shareholder in a number of companies, within the JBP Group, with a focus on the trenchless sector. I am principal and Managing Director of JBP Composites and also Export Manager for BKP Berolina.


2022-02-08 Webinar

Design Methods for CIPP Liners in Gravity and Pressure Pipes - an Overview

Category: Rehabilitation

Presenter: Tom Sangster
Date: 8 February 2022
Organization: Downley Consultants Ltd

The design of CIPP liners in both gravity and pressure pipes has evolved significantly since the first somewhat empirical designs. There are now well-established methods for gravity pipe liners in the USA, the UK, Germany and France, to name but a few. These are evolving as more research and empirical evidence shows that the modified Glock method is more accurate than the Timoshenko method formerly used. France and Germany have already made the transition and the UK is doing so at present. The USA is expected to follow as well. In pressure pipes the situation is less clear and significant challenges remain in understanding the interactions between the liner and the host pipe. This webinar will review the design approaches for both gravity and pressure liners and will identify the key areas where more research and information is required, especially in the design of pressure pipe liners.

closefit liner


• About Tom Sangster

Tom Sangster is a professionally qualified Civil Engineer with 35 years of experience in geotechnical engineering and underground pipe networks and is Managing Director of Downley Consultants, an internationally renowned consulting engineer specializing in trenchless technology projects worldwide. 

His experience in underground infrastructure encompasses inspection, assessment, and rehabilitation and in developing strategies for managing rehabilitation programs including risk management. He is a member of the Council of UKSTT and a past President of the Swiss Society for Trenchless Technology, CHSTT.



2021-12-10 Webinar

On the Soil Behavior due to Rectangular Pipe Jacking

Category: Pipe jacking

Presenter: Prof. Hideki Shimada
Date: 10 December 2021
Organization: Kyushu University

The rectangular pipe has a higher utilization space comparing with the circular pipe, therefore, the rectangular pipe jacking has more potential applications for underground space excavation. However, ground response, jacking force, and pipe bearing state during rectangular pipe jacking are necessary to be analyzed before construction. In this presentation, four different rectangular pipe aspect ratios with the same utilization cross-section were investigated by using the 3D finite element method. In addition, till now, there is no generally accepted prediction equation for rectangular pipe jacking. It is suggested that the prediction equations of circular jacking will overestimate the jacking force for rectangular pipe jacking. Therefore, the modified prediction equation is established by considering the mechanism and behavior of the surrounding soil. In order to implement the specific phenomenon of friction force, the pipe-soil contact ratio λ is defined to evaluate the contact state, before being introduced to the modified friction force prediction equation. This modified friction force equation was verified and is applicable for the jacking force of rectangular pipe lacking.

Rectangular pipejacking


◆About Prof.Hideki Shimada

Hideki Shimada, Professor of Department of Earth Resources Engineering, Kyushu University. He has published over 100 papers, and based on the citations report of 47 papers collected by Web of Science, the average H-index is 10 with 292 citations. He also published two books, and more than 20 scientific publications were in major international journals and top world conferences. He has achieved Academic Category Winner by International Society Trenchless Technology, No-Dig Award 2007 and 2013. He is now Vice-Chair of JSTT.



2021-10-07 Webinar

Pipe rehabilitation with stainless steel sleeve

Category: Rehabilitation

Presenter: Christopher Rings and Mark André Haebler
Date: 7 October 2021
Organization: Uhrig Kanaltechnik GmbH

Pipe rehabilitation and repair with stainless steel sleeve is a purely mechanically installation system made of stainless steel and an EPDM compression seal for all common sewer, well, drinking water, and industrial pipes. The stainless-steel sleeve can be used for many different applications. Besides normal cracks, fragmented pipes, or in- & exfiltration you can also use it for root penetration or leaking joints. If the damage is longer than the sealing area of a single sleeve, it can be installed in serial as well.

How does it work?
The system seals and stabilizes the damage completely by mechanical, that means without any chemicals. Furthermore, the system is suitable for all common pipe materials (concrete, plastic and so on). The locking system – which is placed in the inside of the stainless-steel sleeve – ensures that the sleeve stays permanently in position. To expand the sleeve a special packer or special assembly tools are necessary. After the rehabilitation, the sleeve has its own static capability and absorbs the natural tectonic movements of the pipe.
And the WHY, we will explain during the presentation. This will not be a commercial webinar; we also reflect to the IKT report of partial repair and the DWA and EN standards.


◆About Christopher Rings

Mr. Christopher Rings is with Uhrig Kanaltechnik GmbH since October 2020. In his position, he is responsible for sales/support in the European market. Before he came to Uhrig, he worked 10 years for Vetter, a German manufacturer of Pipe Plugs where he gain valuable experience in the European trenchless technology market.

◆About Mark André Haebler (only for Q&A)

Mr.Mark André Haebler, MBA is with Uhrig Kanaltechnik GmbH since November 2017. In his position as Head of International Sales & Development, he is responsible for the world-wide sales, partner support and his team. Prior to his current position, he was part of the management team of Hermes Technologie GmbH, a German leader in trenchless support of manhole rehabilitation based on mortars and gouts. He is also vice president of the Austrian Association of Trenchless Technology and a member of the Board of Directors of the ISTT.



2021-08-05 Webinar

Cured in Place materials and system quality assurance based around a performance specification and site evaluation

Category: Rehabilitation

Presenter: Ian Ramsay
Date: 5 August 2021
Organization: UKSTT - ViceChair

Cured in Place Pipelining (CIPP) has been around for circa. 50 years. Many thousands of kilometers have been installed successfully around the world since then. Standards such as ASTM and EN/DN have been developed to cover the quality, performance, and strength of the final product. CIPP is not suitable in every case for rehabilitation but is a valuable tool in the box of trenchless techniques.

Various different materials used in CIPP are available from a standard coated felt construction to reinforced layers. Resin technology has developed with various hybrid resins now available in addition to the standard polyester resins, whilst curing methods from ambient to hot water, steam, and UV/LED have also developed over the years.

Identifying the right system or choosing the right materials and processes can be very confusing when looking at a project. 

In this webinar, we will explore the factors around the selection and specification of a CIPP solution which is fit for purpose. It will cover:

  • Who can specify a CIPP solution
  • How a performance specification is developed and executed. 
  • The key factors in the selection process of the materials and curing system. 

We will also look at the project execution itself and QA/QC regarding the setup, time constraints, and various key factors to determine a successful installation and client handover.


◆ About Ian Ramsay

Ian has been involved in the trenchless market for over 25 years. Primarily around CIPP, both large and small diameter, he has worked throughout the world involved in project planning, specifications and material selection & supply. Ian is past chair of the UKSTT and is currently serving another term as vice-chair as well as being a board member of the ISTT.




2021-06-23 Webinar

Repair of lateral sewers and lateral connections - comparison of techniques and quality assurance

Category: Rehabilitation

Presenter: Dr. Iain Naismith and Dipl.-Ing. Serdar Ulutaş
Date: 23 June 2021
Organization: IKT – Institute for Underground Infrastructure

This webinar highlights the lessons learned from 1:1 scale evaluation of the performance of technologies available for the repair of lateral sewers, particularly the use of patch repairs, and repair of lateral connections.
Smaller diameter lateral sewers which connect properties to main sewers are often in private ownership for at least part of their length, but sewer network owners may own all or part of them and/or be responsible for providing advice to property owners concerning their repair. Poor connections to main sewers are often a cause of groundwater ingress into sewer networks.
This webinar considers the findings from several large scale 1:1 comparative evaluations of the performance of different technologies for the repair of lateral sewers and lateral connections undertaken at IKT on behalf of German sewer network owners. These had a particular focus on the ability of products to stop groundwater infiltration and identifying quality assurance measures to be considered to ensure that installed solution will work effectively.
It will cover:
• Background to the issues
• Comparative evaluation of lateral connection repair technologies
• Repair of lateral sewers, particularly the use of patch repair


◆About: Dr. Iain Naismith
Dr Iain Naismith is a Senior Research Fellow at IKT with 35 years of experience in environmental, water and sewerage-related research. Based in the UK, he has a particular focus on international projects and knowledge sharing for this not-for-profit engineering research institute. He has been involved in the evaluation of performance of sewerage repair and rehabilitation products and products in contact with drinking water for some 20 years.

◆About: Dipl.-Ing. Serdar Ulutaş
MBA is a senior research fellow and head of the IKT Compare testing
programme for the comparative evaluation of technologies. In this role he is responsible for
recruiting sewer network operators for participation in comparative technology/product tests,
development of test concepts, construction of rigs and conducting evaluations.


2021-05-20 Webinar

Sewer Manhole Rehabilitation – quality assurance and comparison of techniques

Category: Rehabilitation

Presenter: Dr. Iain Naismith and Dipl.-Ing. Markus Gillar
Date: 20 May 2021
Organization: Senior Research Fellows at IKT – Institute for Underground Infrastructure (Germany)

This webinar highlights the lessons learned from 1:1 scale evaluation of the performance of technologies available for the rehabilitated of manholes, with a particular focus on sealing against ground water infiltration.
The surcharging of sewer systems by groundwater impacts both their operation and that of the wastewater treatment works they connect to. Relining sewer pipes is part of the answer, but manhole shafts are also a significant pathway for infiltration.

This webinar explains the approach taken, at the request of German sewer network owners, to provide them with knowledge about performance and limits of manhole rehabilitation technologies and what quality assurance issues they need to be aware of. It will also signpost attendees to where this information is publicly available.

It will cover:
• Sewer manhole functions and the issues associated with them
• How IKT went about examining rehabilitation, defining damage patterns and reviewing the market
• What was discovered about the performance of rehabilitation techniques
• Key issues for applying QA to installations


2021-04-23 Webinar

Pipeline inspections and accurate information for no-dig process, Case in Finland

Category: Pipe inspection

Presenter: Tiia Lampola
Date: 23 April 2021
Organization: Riihimäki Water, Finland

The commonly used CCTV method is quite slow, e.g., due to the requirement of pre-cleaning (or -washing) of the pipelines. The process of choosing the parts of the water supply or sewer network for the inspection process is often also very vague and is made with too little information of the network. Pre-screening and analysis are often neglected or done only partly, which gives too little data for the proper and accurate process of pipeline inspections. See the full report from here.

The presented inspection methods and stages of the inspection process include:
· pre-screening methods
· requirements for the pre-cleaning (or -washing)
· CCTV and digital CCTV methods
· acoustic methods
· electrical and magnetic methods
· inspection methods for tunnels
· inspection methods for manholes


2021-03-25 Webinar

Considerations of Design and Construction for Horizontal Directional Drilling

Category: HDD

Presenter: Dr. Samuel Ariaratnam
Date: 25 March 2021
Organization: Arizona State University

This presentation explores considerations of design and construction for HDD and offers insights into ways to increase project success. Technological advancements, design ingenuity, and construction innovations are all key elements that have led to increased adoption of this trenchless method.


2021-01-29 Webinar

Estimating the Jacking Forces for Pipejacking

Category: Microtunneling and Pipe Jacking

Presenter: Prof. Keh-Jian (Albert) Shou
Date: 29 January 2021
Organization: ISTT vice-chair / National Chung-Hsing University, Taiwan

Among the others, pipejacking could be the most popular new installation trenchless methods. Jacking force is critical for a successful pipejacking, in which the control factors include overburden depth, frictional coefficient of soil-pipe interface, overcut, alignment, etc. Empirical formulas of jacking forces were reviewed. Comparisons on jacking forces with case studies were illustrated and discussed. New estimation method was also established and discussed.


2020-12-17 Webinar

A review of developments in UV Cured CIPP lining from its introduction in 1985

Category: Cured in Place Pipeliners

Presenter: Dr. Dec Downey
Date: 17 December 2020
Organization: Trenchless Opportunities Ltd

UV Curing for Cured in place pipelining was developed and launched in the UK and Sweden by Insituform Group and INPipe AB in the mid1980s. It took some time to establish but over the past twenty years has made a major contribution to the growth of CIPP worldwide. It offers certain advantages over more traditional curing methods but requires investment in technology, quality management, and skilled operators to take full advantage of its potential. This presentation will provide an appraisal of the technology and a glimpse at what the future may hold. (This webinar is available to ISTT members only.)


2020-11-18 Webinar

Environmental Impact Assessment of Steam-Cured Cured-in-Place Pipe (CIPP)

Category: Cured in Place Pipeliners

Presenter: Dr. John C. Matthews
Date: 18 November 2020
Organization: Trenchless Technology Center (TTC) Director, Louisiana Tech University, Ruston, LA, USA

This presentation will discuss the findings from a recent study of the potential environmental impacts of steam-cured cured-in-place pipe (CIPP) installations. This comprehensive study collected real data from multiple projects using various sampling methods to determine the extent of any impacts. The objectives of the study were to both evaluate air emissions from steam-cured CIPP and determine potential impacts on workers. This was accomplished by directly measuring worker exposure to emissions for locations onsite or offsite. The installation sites represented a range of scenarios typical of CIPP installations. Dispersion of the emissions were modelled to estimate compound concentrations for a large set of scenarios and weather conditions. The potential health risks were evaluated based on appropriate health-based action levels using the measured and modeled data.