WATERTIGHTNESS TESTER AND INSPECTION METHOD

To provide a watertightness tester which is compact, can cope with a case where the inner diameter of a water pipe is slightly different, and has excellent workability, and an inspection method.SOLUTION: A watertightness tester includes: a cylindrical main body 2 that enters a pipe and receives the external pressure of test water Wt; and a pair of water stop parts 3 provided at both ends of an inspection area α in the middle of the main body 2 in an axial direction S, which are brought into contact with the inner surface of the pipe to stop the test water Wt by expanding the diameter with pressurized water Wp. An inspection method includes following steps of: installing a watertightness tester by inserting one of the pair of water stop parts 3 into a first piping material 51 and expanding the diameter of the one of the water stop parts 3; expanding the diameter of the other of the pair of water stop parts 3 after a second piping member 52 is joined to the first piping member 51 so that the pair of water stop parts 3 straddle a joint portion 53; and conducting a watertightness test by supplying the test water Wt between the pair of water stop parts 3 with diameters enlarged.SELECTED DRAWING: Figure 5 【課題】コンパクトで、かつ、配水管の内径が若干異なる場合にも対応でき、作業性に優れた水密テスト機および検査方法を提供することである。【解決手段】水密テスト機は、配管内に入り込みテスト水Ｗｔの外圧を受ける筒状の本体２と、本体２の軸方向Ｓの中間の検査領域αの両端に設けられ加圧水Ｗｐにより拡径することで配管の内面に接してテスト水Ｗｔを止水する一対の止水部３とを備え、検査方法は、第１の配管材５１の内部に一対の止水部３の一方が挿入された状態で一方の止水部３を拡径して水密テスト機を設置する工程と、一対の止水部３が継手部５３を股ぐような状態となるように第１の配管材５１に第２の配管材５２を接合した後に、一対の止水部３の他方を拡径させる工程と、拡径した一対の止水部３の間にテスト水Ｗｔを供給して、水密テストを行う工程とを備える。【選択図】図５