{"@context":"http://schema.org","@type":"Dataset","@id":"https://doi.org/10.60933/PRDR/NBJJEM","identifier":"https://doi.org/10.60933/PRDR/NBJJEM","name":"Thermal imaging dataset from buried ductile iron pipe inspected by in-pipe thermography under convective heating","creator":[{"@type":"Person","givenName":"Samuel","familyName":"YU","affiliation":{"@type":"Organization","name":"The Hong Kong Polytechnic University"},"sameAs":"https://orcid.org/0000-0002-5615-9956","@id":"https://orcid.org/0000-0002-5615-9956","identifier":"https://orcid.org/0000-0002-5615-9956","name":"YU, Samuel"},{"@type":"Organization","parentOrganization":{"@type":"Organization","name":"The Hong Kong Polytechnic University"},"name":"HO, Marco Kin Pan"},{"@type":"Person","givenName":"Wallace Wai-lok","familyName":"LAI","affiliation":{"@type":"Organization","name":"The Hong Kong Polytechnic University"},"sameAs":"https://orcid.org/0000-0002-0696-6741","@id":"https://orcid.org/0000-0002-0696-6741","identifier":"https://orcid.org/0000-0002-0696-6741","name":"LAI, Wallace Wai-lok"},{"@type":"Person","givenName":"Janet Fung Chu","familyName":"SHAM","affiliation":{"@type":"Organization","name":"The Hong Kong Polytechnic University"},"sameAs":"https://orcid.org/0000-0001-6424-5734","@id":"https://orcid.org/0000-0001-6424-5734","identifier":"https://orcid.org/0000-0001-6424-5734","name":"SHAM, Janet Fung Chu"},{"@type":"Person","givenName":"Chun Yiu","familyName":"HO","affiliation":{"@type":"Organization","name":"The Hong Kong and China Gas Company Limited"},"name":"HO, Chun Yiu"}],"author":[{"@type":"Person","givenName":"Samuel","familyName":"YU","affiliation":{"@type":"Organization","name":"The Hong Kong Polytechnic University"},"sameAs":"https://orcid.org/0000-0002-5615-9956","@id":"https://orcid.org/0000-0002-5615-9956","identifier":"https://orcid.org/0000-0002-5615-9956","name":"YU, Samuel"},{"@type":"Organization","parentOrganization":{"@type":"Organization","name":"The Hong Kong Polytechnic University"},"name":"HO, Marco Kin Pan"},{"@type":"Person","givenName":"Wallace Wai-lok","familyName":"LAI","affiliation":{"@type":"Organization","name":"The Hong Kong Polytechnic University"},"sameAs":"https://orcid.org/0000-0002-0696-6741","@id":"https://orcid.org/0000-0002-0696-6741","identifier":"https://orcid.org/0000-0002-0696-6741","name":"LAI, Wallace Wai-lok"},{"@type":"Person","givenName":"Janet Fung Chu","familyName":"SHAM","affiliation":{"@type":"Organization","name":"The Hong Kong Polytechnic University"},"sameAs":"https://orcid.org/0000-0001-6424-5734","@id":"https://orcid.org/0000-0001-6424-5734","identifier":"https://orcid.org/0000-0001-6424-5734","name":"SHAM, Janet Fung Chu"},{"@type":"Person","givenName":"Chun Yiu","familyName":"HO","affiliation":{"@type":"Organization","name":"The Hong Kong and China Gas Company Limited"},"name":"HO, Chun Yiu"}],"datePublished":"2025-05-17","dateModified":"2025-05-23","version":"1","description":"This dataset presents a thermal imaging dataset from a buried ductile iron pipe that were in-pipe inspected by infrared thermography with convective heating by hot air to validate whether convective heating is a reliable way in detecting and characterising external corrosion of metallic underground utilities (manually milled flat bottom holes on the outer pipe wall representing corroded regions). A heat blower was set to 50 °C, and the hot air was blown into the pipe with a 400 mm diameter at a velocity of 0.8 m/s for approximately 140 seconds. The pipe is 1.5 m long with a wall thickness of 8 mm, with an initial temperature of 22.3 °C. 36 flat-bottom holes were milled on the outer pipe wall, spread in 6 circumferential rings and angular direction. Three types of milled shapes with three different lateral sizes of 75 mm, 50 mm, and 25 mm were designed with varying residual thickness ranging from 1.7 mm to 4.4 mm. A Tau2 infrared camera in tunnel-view (facing frontward) is used to record the thermal images at an 8.7 frames per second sampling rate. Finally, the dataset proposed consists of 1 sequence of 4446 images of 640 x 512 pixels.","keywords":["Engineering","Infrared Thermography","Non-destructive Testing","Flat Bottomed Hole","Convective Heating","In-pipe Inspection"],"license":"http://creativecommons.org/licenses/by-nc/4.0","includedInDataCatalog":{"@type":"DataCatalog","name":"PolyU Research Data Repository","url":"https://researchdata.lib.polyu.edu.hk"},"publisher":{"@type":"Organization","name":"PolyU Research Data Repository"},"provider":{"@type":"Organization","name":"PolyU Research Data Repository"},"funder":[{"@type":"Organization","name":"HO, Chun Yiu"},{"@type":"Organization","name":"Innovative Technology Fund by HKSAR Government"},{"@type":"Organization","name":"The Hong Kong and China Gas Company Limited"}],"distribution":[{"@type":"DataDownload","name":"DI-IP-TV-9Hz-sand_0-999.zip","encodingFormat":"application/zip","contentSize":318600691,"contentUrl":"https://researchdata.lib.polyu.edu.hk/api/access/datafile/644"},{"@type":"DataDownload","name":"DI-IP-TV-9Hz-sand_1000-1999.zip","encodingFormat":"application/zip","contentSize":289149624,"contentUrl":"https://researchdata.lib.polyu.edu.hk/api/access/datafile/645"},{"@type":"DataDownload","name":"DI-IP-TV-9Hz-sand_2000-2999.zip","encodingFormat":"application/zip","contentSize":263749846,"contentUrl":"https://researchdata.lib.polyu.edu.hk/api/access/datafile/646"},{"@type":"DataDownload","name":"DI-IP-TV-9Hz-sand_3000-3999.zip","encodingFormat":"application/zip","contentSize":260577674,"contentUrl":"https://researchdata.lib.polyu.edu.hk/api/access/datafile/642"},{"@type":"DataDownload","name":"DI-IP-TV-9Hz-sand_4000-4445.zip","encodingFormat":"application/zip","contentSize":117077880,"contentUrl":"https://researchdata.lib.polyu.edu.hk/api/access/datafile/643"},{"@type":"DataDownload","name":"README.md","encodingFormat":"text/markdown","contentSize":5951,"contentUrl":"https://researchdata.lib.polyu.edu.hk/api/access/datafile/656"},{"@type":"DataDownload","name":"Schematic drawings of the design defects.png","encodingFormat":"image/png","contentSize":37227,"description":"This is a schematic drawing of the design pipeline illustrating the distribution of the milled flat-bottomed holes on the exterior of the pipeline. ","contentUrl":"https://researchdata.lib.polyu.edu.hk/api/access/datafile/652"},{"@type":"DataDownload","name":"Table of Defects on 400 mm pipe.png","encodingFormat":"image/png","contentSize":172120,"description":"This is a table of the milled flat-bottomed holes distributed on the exterior of the pipeline with their angular direction and distance from the pipe entrance. The milled flat bottom holes are labelled with their ring numbers (R1-R6), lateral dimension (25 mm, 50mm, 75 mm), shape (Circle - C, Square - S, and Peanut - I), and residual thickness (1.7 mm - 4.4 mm)","contentUrl":"https://researchdata.lib.polyu.edu.hk/api/access/datafile/653"}]}