Note: 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.

12th September 2025
14:00 -15:00 GMT

Sebastiaan Maan 200

Sebastiaan Maan

Sector Manager Cables and Pipelines, BT Engineering B.V., The Netherlands

Jaap Joosse 200

Jaap Joosse

Senior Geotechnical and Pipeline Engineering, BT Engineering B.V., The Netherlands

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Overview
As part of a larger project, two parallel Horizontal Directional Drills (HDDs) were installed for pipelines with a diameter of 500 mm and a length of 1800 m. These pipelines were designed to withstand a pressure of 80 bar and had to accommodate temperature fluctuations of up to 70 degrees Celsius. Due to restrictions in the right-of-way for the project, conventional expansion loops or other temperature compensation measures were not permitted. In the presentation, the team discussed the trade-offs of various solutions considered for this challenge. The final solution was thoroughly analyzed by assessing the effects of a collapsed borehole in different locations, the impact of borehole deviation, sensitivity to temperature changes, and more.

Above: HDD Construction Site Overview

Top: Von Mises Stress, Middle: Axial Displacement, Bottom: Axial Force Under Temperature Variation

About Sebastiaan Maan
Sebastiaan Maan has a background in Civil Engineering. He finished his Master’s at TU Delft in 2014 and has been working at BT Engineering ever since. He started out as an engineer in geotechnical engineering, but soon started combining this field with pipeline engineering. In HDD engineering, both fields are necessary to cover all the risks involved in engineering and execution. Sebastiaan has engineered and directed the execution of many HDDs over the years, both in his home country, the Netherlands, and internationally.

About Jaap Joosse
Jaap Joosse has a background in geotechnical and hydraulic engineering. He finished his Master’s at the TU Delft. During his professional career, he finished a master's degree in pipeline technology with a specialization in soil-pipe interaction parameters/behaviour and pipe trenching soil retaining structures. After a brief period working as an offshore geotechnical engineer, Jaap started working at BT Engineering. He filled a diverse range of technical roles, such as Technical Manager and Lead pipeline and piping Engineer in all kinds of pipeline projects in the Netherlands and internationally. He published the article "Design optimization of retaining walls in narrow trenches using both analytical and numerical methods."