Patent Number: 044329318
Section: claims

1. A system for remote visual inspection of a structure comprising: a primary vessel surrounded by a containment vessel; at least one substantially rigid fixed conduit member terminating at a first end adjacent an upper portion of said vessels and a second end adjacent an area to be inspected, said conduit member being provided with at least one aperture in the wall thereof adjacent the area to be inspected;  a housing containing a camera and a light source for insertion into said first end of said conduit member;  means for controlling the temperature of said camera; support means for said housing, said support means including at least a first hollow, flexible hose member having a first end connected to said housing and a second end attached to a spool assembly positioned adjacent said upper portion of said vessels;  means for supplying electrical power to said camera and light source and for transmitting signals from said camera;  display means for receiving signals from said camera;  pressurizing means for introducing a fluid into said flexible hose member in an amount sufficient to provide a desired amount of rigidity to the hose member to facilitate movement of said housing and hose member through the rigid fixed conduit member and;  means for driving said support means into said conduit member to position said housing adjacent the area to be inspected. 2. The system of claim 1 wherein said area to be inspected comprises a weld seam along one of said vessels and said substantially rigid fixed conduit member extends along said seam and is provided with a plurality of closely spaced apertures adjacent said seam. 3. The system of claim 1 wherein there are provided a plurality of substantially rigid fixed conduit members. 4. The system of claim 3 further including a recorder for receiving and recording signals from said camera for providing a means of comparing visual inspections taken at different times. 5. The system of claim 1 wherein said housing further includes positioning means for maintaining said housing substantially in the center of said conduit member. 6. The system of claim 5 wherein said positioning means comprises at least one set of rollers positioned about the periphery of said housing. 7. The system of claim 5 wherein said positioning means comprises a plurality of sets of rollers about the periphery of said housing and said conduit member. 8. The system of claim 1 wherein said support means further includes a second hollow, flexible hose member, one of said hose members being located within and coaxial with the other of said hollow, flexible hose members, the inner surface of one hose member and the outer surface of the other hose member defining an annular space therebetween, the first and second hose members providing a flow path for fluid from said pressure means to said housing and back to the upper portion of said vessels, said fluid passing in heat-exchange relationship with said camera and providing said means for controlling the temperature of said camera. 9. The system of claim 8 wherein said fluid is a gas. 10. The system of claim 9 wherein said gas is selected from the group consisting of nitrogen, helium, argon, and carbon dioxide.