WATER-TIGHT PROPERTY TEST DEVICE AND WATER-TIGHT PROPERTY TEST METHOD

PROBLEM TO BE SOLVED: To examine a water-tight property of a junction between a steel swivel joint ring and tube bodies without reducing an operability even if a distance between end faces of the tube bodies are increased.SOLUTION: A device for examining a water-tight property between opposing tube bodies P, P and a steel swivel joint ring J in a state where the steel swivel joint ring J joins on edge parts on outer peripheral surfaces of the opposing tube bodies P, P comprises an annular frame 2; a plurality of pressing members 3 having arcuate peripheral surfaces extendable and withdrawable in a radial direction with respect to the annular frame 2; an endless seal member 4 installed on the plurality of pressing members 3; and an endless gasket 5 arranged on an internal peripheral surface of the steel swivel joint ring at a preset distance from an end surface of one of the tube bodies P1. The seal member 4 is pressed via the pressing member 3 by an internal peripheral surface side edge part of the one of the tube bodies P1 and an internal peripheral surface of the gasket 5, and a pressurizing water is supplied to an annular space defined by the steel swivel joint ring J, the one of the tube bodies P1, the gasket 5, and the seal member 4 to examine the water-tight property of the joint between the steel swivel joint ring J and the one of the tube bodies P1.