METHOD FOR TESTING PASSAGE OF PIPE

摘要

PURPOSE:To confirm the passage of a pipe in high reliability by confirming even the bending state of the pipe. CONSTITUTION:Before compression an optical fiber cable 5 into a pipe 4, whether the laying state at the bending part of the pipe 4 is more than an allowable bending radius R of curvature or not is confirmed by using a test piece (of a rod) 3. The test piece 3 has the weight which can be carried on the flow of fluid and comprises an FRP rod 2 having the high bending rigidity and aluminum caps 1 and 1 which cover both ends as sliding materials. The diameter phi0 of the test piece 3 is made smaller than the internal diameter PHIof the pipe 4 and larger than the diameter phi of the passing optical fiber cable 5. The length is I0 at which the cable cannot pass when it is smaller than the allowable bending radius R of curvature. Air is made to flow into the pipe at a pressure of 5kgf/cm<2>. The test piece 3 is mounted on the flow of the air. The pass or fail of the optical fiber cable 5 is determined based on the pass or fail of the passage.