Television – Special applications – Hazardous or inaccessible
Reexamination Certificate
1999-03-09
2001-11-06
Le, Vu (Department: 2613)
Television
Special applications
Hazardous or inaccessible
C348S082000, C348S083000, C348S085000
Reexamination Certificate
active
06313869
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to inspection systems. More specifically, the present invention is drawn to a video camera system for inspecting the internal surfaces of pipes or vessels having interiors with limited accessibility.
2. Description of the Related Art
In a pressurized-water, nuclear-powered, electric generating system, the heat generated by a nuclear reactor is absorbed by a primary coolant that circulates through the reactor core and is utilized to transfer heat and produce steam inside the steam generator. The steam generator usually is an upright cylindrical pressure vessel with hemispherical end sections. To balance the water level inside the steam generator, a feedwater inlet-and-ring assembly introduces new water volume to offset the water loss in the steam production cycle. The feedwater is introduced from the ring assembly through “J” nozzles. “J” nozzles, which are well known in the art, are curved pipes positioned at intervals on top of the ring assembly. Typically, the nozzles are installed by drilling out the ring assembly and welding in the “J” nozzle. The ring section is usually assembled in segmented, weld-prepared sections. This assembly technique requires that backup rings are inserted in the ring assembly to establish a reinforcing structure for supporting the weld when the ring sections are assembled. Over time, the backup rings begin to erode due to the flow and velocity of the water churning through the ring assembly. Sections of the backup ring can break away and exit through the “J” nozzles. These breakaway sections are now free to wreak havoc by banging and vibrating against the steam generator tubes causing damage or rupture. The same scenario has been documented with “J” nozzle welds which have eroded and allowed the nozzles to become loose projectiles inside the steam generator.
The above scenarios have necessitated the need for efficient and effective inspection of the feedwater piping without loss of schedule, while also limiting the time for inspection to prevent unnecessary radiation dosage.
The current standard in the industry for inspection is the videoprobe. There are, however, inherent problems in its use. Videoprobes are relatively expensive, difficult to use, easily broken, costly to repair, and inspections are time consuming, using up radiation dosage. Also, the supply and repair are monopolized by a small number of companies. Videoprobes also magnify the viewed subject many times its size, depending on the distance the probe is from the viewed subject. Low lighting levels require that the viewed piping section be no more than 1-2 inches from the probe's camera and orientation of the probe in the piping interior is difficult to determine. Videoprobes also make no provision for interchanging camera lenses and light reflectors.
Other prior art devices for inspecting interior pipe surfaces are disclosed in U.S. Pat. No. 3,761,623 (Hara et al.), U.S. Pat. No. 4,246,604 (Hundertmark et al.), U.S. Pat. No. 4,424,531 (Elter et al.), U.S. Pat. No. 4,677,472 (Wood), U.S. Pat. No. 4,855,838 (Jones et al.), U.S. Pat. No. 5,084,764 (Day), U.S. Pat. No. 5,195,392 (Moore et al.), U.S. Pat. No. 5,457,288 (Olsson); EPO Patent 511,934, and Japanese Patent 4-188,098.
None of the above inventions and patents, taken either singularly or in combination, is seen to disclose an articulating camera system with variable lighting and interchangeable lens capability as will be described and claimed in the instant invention.
SUMMARY OF THE INVENTION
The present invention is an inspection system for the inner surfaces of pipes and vessels. The system comprises a high-resolution, miniature video camera and lighting arrangement which are disposed on a first rotatory wheel, which wheel is mounted on a yoke positioned at the distal end of a flexible umbilical-type conduit. The camera is designed with interchangeable lens capability which enhances the system's ability to adequately resolve the subject matter image so that minute details can be magnified. The lighting arrangement is provided with variable intensity adjustment control. The light reflectors are also interchangeable to enhance interior viewing. Up and down arcuate movement of the camera and light is accomplished through two control cables connected to the first rotatory wheel. The control cables are funneled through the yoke and the umbilical-type conduit to a second rotatory wheel positioned at the control end of the conduit. The yoke and conduit also bundle camera and light control cables. A control rod is connected to the second rotatory wheel. Arcuate vertical 180 degree movement of the camera and light is accomplished by moving the control rod in a 0-180 degree arc. Horizontal movement is accomplished by simply rotating the entire umbilical conduit.
The present invention results in a cost-effective, repairable inspection system that is durable, efficient, and will cut inspection time to a minimum in regard to schedule and radiation dosages.
Accordingly, it is a principal object of the invention to provide an improved system for inspecting the interior surfaces of pipes and vessels.
It is another object of the invention to provide an improved inspecting system which incorporates a high resolution miniature camera with interchangeable lenses.
It is a further object of the invention to provide an improved inspecting system which incorporates a lighting arrangement with variable intensity control and interchangeable reflectors.
Still another object of the invention is to provide an improved inspecting system that utilizes a unique device for orienting a camera and light.
It is an object of the invention to provide improved elements and arrangements thereof for the purposes described which are inexpensive, dependable and fully effective in accomplishing their intended purposes.
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Habermann William J.
Hyp Edward J.
Le Vu
Litman Richard C.
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