Apparatus for inspecting piping

• US 5,398,560 A
• Filed: 07/12/1993
• Issued: 03/21/1995
• Est. Priority Date: 07/12/1993
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Department Of Energy
• Original Assignee: United States Department of Energy
• Inventors: Park, Larry R., Zollingger, W. Thor, Appel, D. Keith
• Primary Examiner(s): Williams, Hezron E.
• Assistant Examiner(s): LARKIN, DANIEL SEAN
• Application Number:
  US08/089,679
• Time in Patent Office: 617 Days
• Field of Search: 73/865.8, 73/866.5, 73/432.1, 73/623, 73/638, 324/200, 324/220, 324/221, 324/226, 324/228, 376/245, 376/249, 174/136, 174/137 R, 174/137 A, 174/137 B, 254/134.3 FT
• US Class Current: 73/865.8
• CPC Class Codes: G01N 2291/2636 cylindrical from inside
• CPC Class Codes: G01N 27/902 by moving the sensors
• CPC Class Codes: G01N 29/265 by moving the sensor relative to a stationary material
• CPC Class Codes: G21C 17/017 Inspection or maintenance of pipe-lines or tubes in nuclear installations
• CPC Class Codes: Y02E 30/30 Nuclear fission reactors

Abstract

An inspection rabbit for inspecting piping systems having severe bends therein. The rabbit consists of a flexible, modular body containing a miniaturized eddy current inspection probe, a self-contained power supply for proper operation of the rabbit, an outer surface that allows ease of movement through piping systems and means for transmitting data generated by the inspection device. The body is preferably made of flexible polyvinyl chloride (PVC) tubing or, alternatively, silicone rubber with a shrink wrapping of polytetrafluoroethylene (TEFLON®). The body is formed to contain the power supply, preferably a plurality of batteries, and a spool of communication wire that connects to a data processing computer external to the piping system.

Claims

1. Apparatus for inspecting piping, said apparatus comprising:

a body having an axis, said body made of a resilient material, said resilient material having a first coefficient of friction with respect to said piping;

an inspection instrument carded by said body for measuring a characteristic of said piping and generating data related to said characteristic; and

a flexible outer surface covering said body, said outer surface made of a material selected from the group consisting of polytetrafluoroethylene and polyvinyl chloride, said outer surface having a second coefficient of friction with respect to said piping, said second coefficient of friction being less than said first coefficient of friction so that said outer surface enables said apparatus to slip through said piping.

2. The apparatus as recited in claim 1, wherein said outer surface further comprises a flexible tube having a plurality of ribs formed thereon for increasing the flexibility of said body transverse to said axis so that said apparatus can pass through bends in said piping.

3. The apparatus as recited in claim 1, wherein said piping has an interior with obstacles extending therefrom and wherein said resilient material allows said apparatus to pass by said obstacles when said apparatus moves through said piping.

4. The apparatus as recited in claim 1, further comprising means carried by said body for supplying power to said inspection instrument.

5. The apparatus as recited in claim 1, further comprising means in electrical connection with said inspection instrument for transmitting said data from said inspection instrument.

6. The apparatus as recited in claim 1, wherein said body is made of silicone rubber.

7. Apparatus for inspecting piping, said apparatus comprising:

a body having an axis, said body made of a resilient material;

an inspection instrument carried by said body for measuring a characteristic of said piping and generating data related to said characteristic;

a flexible outer surface covering said body and said inspection instrument;

at least one rechargeable battery carded within said body for supplying power to said inspection instrument; and

means formed in said body for allowing said at least one rechargeable battery to be recharged without removing said at least one rechargeable battery from said body.

8. The apparatus as recited in claim 7, further comprising means in electrical connection with said inspection instrument for transmitting data from said inspection instrument.

9. The apparatus as recited in claim 7, further comprising an outer surface covering said body, said outer surface having a plurality of radial slits formed therein for increasing the flexibility of said body transverse to said axis.

10. The apparatus as recited in claim 7, wherein said outer surface further comprises a flexible tube having a plurality of ribs formed thereon for increasing the flexibility of said body transverse to said axis so that said apparatus can pass through bends in said piping.

11. The apparatus as recited in claim 7, wherein said outer surface is made of a material selected from the group consisting of polyvinyl chloride and polytetrafluoroethylene.

12. Apparatus for inspecting piping, said apparatus comprising:

a body having an axis, said body made of a resilient material;

an inspection instrument carried by said body for measuring a characteristic of said piping and generating data related to said characteristic;

a flexible outer surface covering said body and said inspection instrument; and

means in electrical connection with said inspection instrument for transmitting said data from said inspection instrument, said transmitting means playing out electrical wire from said apparatus as said body moves through said piping.

13. The apparatus as recited in claim 12, wherein said body has a front end and a rear end, wherein said transmitting means further comprises electrical wire, and wherein said apparatus further comprises a spool wire case carried by said body so that said electrical wire plays out from said apparatus as said body moves through said piping.

14. The apparatus as recited in claim 12, wherein said outer surface is made of a flexible tube having a plurality of ribs formed thereon for increasing the flexibility of said body transverse to said axis so that said apparatus can pass through bends in said piping.

16. The apparatus as recited in claim 12, further comprising means carried by said body for supplying power to said apparatus.

17. The apparatus as recited in claim 12, wherein said inspection instrument further comprises:

a driver coil carried by said body for generating signals that can permeate said piping;

a detector coil carried by said body for collecting said signals, said signals containing indications of flaws in said piping; and

means disposed within said body and in electrical communication with said detector coil for storing said signals collected by said detector coil.

15. The apparatus as recited in 12, wherein said outer surface is made of a material selected from the group consisting of polyvinyl chloride and polytetrafluoroethylene.