Wear of large steel pipe (D=0.75 m) and polyurethane lined pipe (6 mm in linear thickenss), of which length was 1 m respectively, in dredge pipelines were inves
tigated under real operational conditions.
　The field tests were performed for two kinds of material transported at different dredge site and the total solid output of dredge was 1.73 million m3 for sand and 1.16 million m3 for gravel. Throughout the tests, several on-site wear observations were conducted and the dredging operational data were also obtained simultaneously.
　This report describs the details of circumferential wear distribution for each test pipe according to the dredge executions and the wear resistance of polyurethane lined pipe by comparing with wear of steel pipe. The wear distribution for polyurethane lines pipe shows the circumferential variation on wear resistance because of vertical change of flow patterns. Further, the result of the tests clarifies some basic requirements on the usage of polyurethane lines pipe for actual dredging activities and also for general abrasive slurry transportations.