Tube cutter tool and method of use for coupon removal Page: 4 of 12
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examination of the affected area, which necessitates removal
-of at least a portion .of the damaged area on the tube.
Summary of the Invention
It is a purpose of the present invention to overcome the
disadvantages of the prior art and to provide a tool and .a
method of use therefor for removing only.a small coupon from a
damaged area on a tube.
In-accordance with a preferred embodiment of the
invention the tube cutter tool includes means for cutting a
coupon encompassing at least a portion of the damaged site and
means for holding the coupon in place during cutting. The
tool also includes means for confirming the position of the
cutting'means with respect to the damaged site. Preferably,
the confirmation means comprises a fiber optic viewing lens
positioned near the cutter assembly, the cutting means,
comprises a hole saw and the holding means comprises a drill
located in the center of the hole saw.
In accordance.with a -preferred method of removing a
coupon from a tube, a damaged site on a tube is first located
and a cutting tool is then inserted into the tube.
Thereafter, the tube is cut to obtain a coupon. Preferably,
the damaged site is located by using a multi-coil pancake eddy
current test probe. The test probe may also be used to mark
the interior of the tube at the damaged site, so that the
location of the damaged site may be verified by visual
monitoring means such as fiber optics.
It is, therefore, an objectsof the invention to provide a
tool and a method for analyzing damaged tubes which allows for
removal of only a small coupon rather than an entire tube
It is another object of the invention to provide a tool
and a method of use therefor in which both location and
removal of a damaged section are performed'from the interior
of the tube.
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Nachbar, H.D.; Etten, M.P. Jr. & Kurowski, P.A. Tube cutter tool and method of use for coupon removal, patent, December 31, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc689645/m1/4/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.