Skip to content

Kubota – Ductile Iron Pipe Testing

    With a focus on large-scale testing capacity, this study delves into the challenges faced by buried pipelines, particularly segmented ones within water networks, when confronted with natural disasters such as earthquakes and landslides. The integrity of connections between pipe segments becomes a paramount concern. While novel joint systems are gradually emerging as potential solutions, the evaluation of their performance, especially when applied to large-diameter joints, remains incomplete. In pursuit of a comprehensive understanding, this research conducts a 4-point bending test on a substantial 24-inch NS-type ductile iron pipe, manufactured by Kubota Corporation. Significantly, this pipe is meticulously instrumented with distributed fiber optic sensors to enable continuous monitoring of strain development in both longitudinal and circumferential directions, providing a real-time, in-depth analysis of pipeline behavior. In summation, this investigation delivers critical insights into the response of large-diameter ductile iron pipes when subjected to lateral loading conditions. These findings have the potential to guide and inform future pipeline design improvements, ultimately bolstering the resilience of pipelines to seismic events.

    Figure: Large diameter pipeline testing apparatus.
    Figure: Failure of joint

    Collaborators: East Bay Municipal Utility District (EBMUD), Kubota Co.

    Researchers: Shih-Hung Chiu, Kenichi Soga (UC Berkeley)

    Domains: Laboratory Testing

    Capabilities: Underground Lifeline Infrastructure/ Water Infrastructure

    Publications: Shih-Hung Chiu, Shakhzod Takhirov, Kenichi Soga (2023): Four-Point Bending Testing of 24-in. (600-mm) Diameter NS-type Ductile Iron Pipe. Center for Smart Infrastructure, University of California, Berkeley. Report.