{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,7]],"date-time":"2026-05-07T16:30:25Z","timestamp":1778171425933,"version":"3.51.4"},"reference-count":36,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2024,5,28]],"date-time":"2024-05-28T00:00:00Z","timestamp":1716854400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Korea Ministry of Environment (MOE)","award":["RE201901020"],"award-info":[{"award-number":["RE201901020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This paper describes the development of an in-pipe inspection robot system designed for large-diameter water pipes. The robot is equipped with a Magnetic Flux Leakage (MFL) sensor module. The robot system is intended for pipes with diameters ranging from 900 mm to 1200 mm. The structure of the in-pipe inspection robot consists of the front and rear driving parts, with the inspection module located centrally. The robot is powered by 22 motors, including eight wheels with motors positioned at both the bottom and the top for propulsion. To ensure that the robot\u2019s center aligns with that of the pipeline during operation, lifting units have been incorporated. The robot is equipped with cameras and LiDAR sensors at the front and rear to monitor the internal environment of the pipeline. Pipeline inspection is conducted using the MFL inspection modules, and the robot\u2019s driving mechanism is designed to execute spiral maneuvers while maintaining contact with the pipeline surface during rotation. The in-pipe inspection robot is configured with wireless communication modules and batteries, allowing for wireless operation. Following its development, the inspection robot underwent driving experiments in actual pipelines to validate its performance. The field test bed used for these experiments is approximately 1 km in length. Results from the driving experiments on the field test bed confirmed the robot\u2019s ability to navigate various curvatures and obstacles within the pipeline. It is posited that the use of the developed in-pipe inspection robot can reduce economic costs and enhance the safety of inspectors when examining aging pipes.<\/jats:p>","DOI":"10.3390\/s24113470","type":"journal-article","created":{"date-parts":[[2024,5,28]],"date-time":"2024-05-28T05:19:49Z","timestamp":1716873589000},"page":"3470","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Development of an In-Pipe Inspection Robot for Large-Diameter Water Pipes"],"prefix":"10.3390","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4889-6083","authenticated-orcid":false,"given":"Kwang-Woo","family":"Jeon","sequence":"first","affiliation":[{"name":"Korea Institute of Robotics and Technology Convergence, Pohang 37666, Republic of Korea"},{"name":"Department of Mechanical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eui-Jung","family":"Jung","sequence":"additional","affiliation":[{"name":"Korea Institute of Robotics and Technology Convergence, Pohang 37666, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jong-Ho","family":"Bae","sequence":"additional","affiliation":[{"name":"Korea Institute of Robotics and Technology Convergence, Pohang 37666, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sung-Ho","family":"Park","sequence":"additional","affiliation":[{"name":"Korea Institute of Robotics and Technology Convergence, Pohang 37666, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jung-Jun","family":"Kim","sequence":"additional","affiliation":[{"name":"Korea Institute of Robotics and Technology Convergence, Pohang 37666, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Goobong","family":"Chung","sequence":"additional","affiliation":[{"name":"Korea Institute of Robotics and Technology Convergence, Pohang 37666, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hyun-Joon","family":"Chung","sequence":"additional","affiliation":[{"name":"Korea Institute of Robotics and Technology Convergence, Pohang 37666, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6736-5341","authenticated-orcid":false,"given":"Hak","family":"Yi","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,5,28]]},"reference":[{"key":"ref_1","first-page":"482","article-title":"Assessment of the Deterioration of Large-Diameter Pipe Networks (I): Development of an Assessment Model","volume":"15","author":"Kim","year":"2014","journal-title":"J. Korea Acad.-Ind. Coop. Soc."},{"key":"ref_2","first-page":"1096","article-title":"Assessment of the Deterioration of Large-Diameter Pipe Networks (II): Application to Metropolitan Multi-Regional Water Supply System (1st Phase)","volume":"15","author":"Lee","year":"2014","journal-title":"J. Korea Acad.-Ind. Coop. Soc."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"501","DOI":"10.1016\/S0032-3861(00)00338-4","article-title":"Testing models for penetrant diffusion in glassy polymers","volume":"42","author":"Tonge","year":"2001","journal-title":"Polymer"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1016\/j.ndteint.2017.06.004","article-title":"Non-destructive investigation of aluminum alloy hemmed joints using neutron radiography and X-ray computed tomography","volume":"91","author":"Zheng","year":"2017","journal-title":"NDT E Int."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"437","DOI":"10.1016\/j.apradiso.2004.03.066","article-title":"Advances in neutron radiographic techniques and applications: A method for nondestructive testing","volume":"61","author":"Berger","year":"2004","journal-title":"Appl. Radiat. Isot."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.ndteint.2016.12.010","article-title":"Ultrasonic imaging of nonlinear scatterers buried in a medium","volume":"87","author":"Haupert","year":"2017","journal-title":"NDT E Int."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"643","DOI":"10.1016\/j.ndteint.2005.03.001","article-title":"Application of neuro-fuzzy techniques in oil pipeline ultrasonic nondestructive testing","volume":"38","author":"Ravanbod","year":"2005","journal-title":"NDT E Int."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"478","DOI":"10.1016\/j.ndteint.2004.12.003","article-title":"Improving the time resolution and signal noise ratio of ultrasonic testing of welds by the wavelet packet","volume":"38","author":"Bettayeb","year":"2005","journal-title":"NDT E Int."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"24","DOI":"10.4283\/JKMS.2016.26.1.024","article-title":"A study on the signal correction for multiple defects in MFL type nondestructive testing system","volume":"26","author":"Park","year":"2016","journal-title":"J. Korean Magn. Soc."},{"key":"ref_10","first-page":"15","article-title":"Development of an EMAT system for detecting flaws in pipeline","volume":"24","author":"Ahn","year":"2004","journal-title":"J. Korean Soc. Nondestruct. Test."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Liu, X., Hu, C., Peng, P., Li, R., Zhao, X., and Zheng, D. (2020, January 15\u201317). In-pipe Detection System Based on Magnetic Flux Leakage and Eddy Current Detection. Proceedings of the International Conference on Sensing, Measurement & Data Analytics in the era of Artificial Intelligence (ICSMD) IEEE, Xi\u2019an, China.","DOI":"10.1109\/ICSMD50554.2020.9261677"},{"key":"ref_12","unstructured":"Andrews, M.E., and Eng, P. (1998, January 14\u201317). Large diameter sewer condition assessment using combined sonar and CCTV equipment. Proceedings of the APWA International Public Works Congress, Las Vegas, NV, USA."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Mohammed, M.N., Nadarajah, V.S., Lazim, N.F.M., Zamani, N.S., Al-Sanjary, O.I., Ali, M.A., and Al-Youif, S. (2018, January 14\u201315). Design and development of pipeline inspection robot for crack and corrosion detection. Proceedings of the 2018 IEEE Conference on Systems, Process and Control (ICSPC 2018), Melaka, Malaysia.","DOI":"10.1109\/SPC.2018.8704127"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"6202705","DOI":"10.1109\/TMAG.2018.2846283","article-title":"A new design of MFL sensors for self-driving NDT robot to avoid getting stuck in curved underground pipelines","volume":"54","author":"Kim","year":"2018","journal-title":"IEEE Trans. Magn."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Pasha, M.A., and Khan, T.M. (2016, January 18\u201319). A pipeline inspection gauge based on low cost magnetic flux leakage sensing magnetometers for non-destructive testing of pipelines. Proceedings of the 2016 International Conference on Emerging Technologies (ICET), Islamabad, Pakistan.","DOI":"10.1109\/ICET.2016.7813212"},{"key":"ref_16","unstructured":"Park, J.J., Moon, J.W., Kim, H., Jang, S.C., Kim, D.G., Ahn, K., Ryew, S.M., Moon, H., and Choi, H.R. (November, January 30). Development of the untethered in-pipe inspection robot for natural gas pipelines. Proceedings of the 10th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI), Jeju, Republic of Korea."},{"key":"ref_17","unstructured":"Burkett, S., and Schempf, H. (2006). Proceedings of the Topical Report, The Department of Energy (DoE), National Energy Technology Laboratory (NETL), Carnegie Mellon Univ."},{"key":"ref_18","unstructured":"Kim, Y.G., Shin, D.H., Moon, J.I., and An, J. (2011, January 23\u201326). Design and implementation of an optimal in-pipe navigation mechanism for a steel pipe cleaning robot. Proceedings of the 8th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI 2011), Incheon, Korea."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Mateos, L.A., Kai, Z., and Vincze, M. (2012, January 5\u20138). Towards e_cient pipe maintenance: DeWaLoP in-pipe robot stability controller. Proceedings of the 2012 IEEE International Conference on Mechatronics and Automation (ICMA), Chengdu, China.","DOI":"10.1109\/ICMA.2012.6282337"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Mateos, L.A., Dominguez, M.R.Y., and Vincze, M. (2013, January 3\u20137). Automatic In-pipe Robot Centering from 3D to 2D Controller Simplification. Proceedings of the 2013 Ieee\/Rsj International Conference on Intelligent Robots and Systems, Tokyo, Japan.","DOI":"10.1109\/IROS.2013.6696362"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Zhao, W., Zhang, L., and Kim, J.W. (2020). Design and Analysis of Independently Adjustable Large In-Pipe Robot for Long-Distance Pipeline. Appl. Sci., 10.","DOI":"10.3390\/app10103637"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1016\/j.ndteint.2017.07.017","article-title":"Online nondestructive testing for fine steel wire rope in electromagnetic interference environment","volume":"92","author":"Yan","year":"2017","journal-title":"NDT E Int."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"109","DOI":"10.1109\/TMAG.2013.2283343","article-title":"A Study on the estimation of the shapes of axially oriented cracks in CMFL type NDT system","volume":"50","author":"Kim","year":"2014","journal-title":"IEEE Trans. Magn."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"6202805","DOI":"10.1109\/TMAG.2018.2853618","article-title":"Determination Scheme for Accurate Defect Depth in Underground Pipeline Inspection by Using Magnetic Flux Leakage Sensors","volume":"54","author":"Kim","year":"2018","journal-title":"IEEE Trans. Magn."},{"key":"ref_25","first-page":"6200315","article-title":"Analysis of Magnetic-Flux Leakage (MFL) Data for Pipeline Corrosion Assessment","volume":"56","author":"Peng","year":"2015","journal-title":"IEEE Trans. Magn."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"3513813","DOI":"10.1109\/TIM.2022.3176285","article-title":"A Single\u2014Stage Enhancement-Identification Framework for Pipeline MFL Inspection","volume":"71","author":"Feng","year":"2022","journal-title":"IEEE Trans. Instrum. Meas."},{"key":"ref_27","unstructured":"Fenyvesi, L.L., Colquhoun, I., Kania, R., and Gu, B. (2004, January 4\u20138). NDE Techniques for Reliable Inspection of Carbon Steel Tubes. Proceedings of the International Pipeline Conference, Calgary, AB, Canada."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"12657","DOI":"10.1109\/TIE.2020.3047061","article-title":"Speed Control of Pipeline Inner Detector Based on Interval Dynamic Matrix Control with Additional Margin","volume":"71","author":"Feng","year":"2021","journal-title":"IEEE Trans. Ind. Electron."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"127","DOI":"10.1016\/j.ndteint.2006.09.004","article-title":"An adaptive method for channel equalization in MFL inspection","volume":"40","author":"Zhang","year":"2007","journal-title":"NDT E Int."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Salama, M.M., Nestleroth, B.J., Maes, M.A., Rodriguez, C., and Blumer, D. (2013, January 23). Characterization of the Accuracy of the MFL Pipeline Inspection Tools. Proceedings of the International Conference on Ocean, Offshore, and Arctic Engineering (OMAE), Nantes, France.","DOI":"10.1115\/OMAE2012-83934"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"6201206","DOI":"10.1109\/TMAG.2018.2809671","article-title":"Importance of Magnetizing Field on Magnetic Flux Leakage Signal of Defects","volume":"54","author":"Pham","year":"2018","journal-title":"IEEE Trans. Magn."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"6201105","DOI":"10.1109\/TMAG.2018.2816075","article-title":"Highly Sensitive Planar Hall Magnetoresistive Sensor for Magnetic Flux Leakage Pipeline Inspection","volume":"54","author":"Pham","year":"2018","journal-title":"IEEE Trans. Magn."},{"key":"ref_33","first-page":"805","article-title":"Enhancement and Detection of Mechanical Damage MFL Signals from Gas Pipeline Inspection","volume":"18","author":"Muhammad","year":"1999","journal-title":"Rev. Prog. Quant. Nondestruct. Eval."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"189","DOI":"10.1063\/1.1302002","article-title":"Materials characterization challenges for MFL pipeline inspection","volume":"497","author":"Lord","year":"1999","journal-title":"AIP Conf. Proc."},{"key":"ref_35","unstructured":"Kim, D.-K., Yoo, H.-R., Yoo, J.-S., Kim, D.-K., Cho, S.-H., Koo, S.-J., Woo, R.-Y., and Jung, H.-K. (November, January 30). Development of MFL system for In-pipe Robot for Unpiggable Natural Gas Pipelines. Proceedings of the 10th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI), Jeju, Republic of Korea."},{"key":"ref_36","unstructured":"Korean Standards Association (2024, May 23). KS D 3578: Fittings of Coated Steel Pipes for Water Works. Available online: https:\/\/www.standard.go.kr\/KSCI\/."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/24\/11\/3470\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T14:49:25Z","timestamp":1760107765000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/24\/11\/3470"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,5,28]]},"references-count":36,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2024,6]]}},"alternative-id":["s24113470"],"URL":"https:\/\/doi.org\/10.3390\/s24113470","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,5,28]]}}}