Tube cutter tool and method of use for coupon removal Page: 3 of 12
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TUBE CUTTER TOOL AND METHOD OF USE FOR COUPON REMOVAL
Field of the Invention
,The present invention is related to a tube cutter tool
and a method of using the tool for coupon removal and, more
particularly,, to a tool which is insertable into a tube for
use in removing a portion of the tube at a damaged site
located on the exterior of the tube. The United States
Government has rights in this invention pursuant to Contract
Number DE-AC12-76-SN00052 awarded by the U.S. Department of
Background of the Invention
It is well known in the art that metal tubes used in heat
transfer'devices are susceptible to wear, erosion and other
degradations which may create weaknesses or other potential
failure points. One typical prior-art method to determine the
cause of damage to a tube involves making a circumferential
cut on the tube wall and removing the entire section of the
tube having a damaged portion thereon. This method is useful
where a straight length portion of the tube has been affected.
However, access to more constricted areas and removal of
relatively large sections of tubing is limited where the
cutting procedure is perform-ed from the ~e-te- of the tube. i?/
In particular, the aforementioned prior art method cannot be
utilized where, the damaged area is located in a bent section 'V
of the tube; such as a U-bend where stress cracking or ,
corrosion is most likely to occur. -In these latter cases it
is desirable to remove only the damaged area by cutting away a
small "coupon", plugging the tube and leaving the remaining
section ,of tube 'in.place. For purposes of this disclosure,
the term "coupon" refers to a small specimen of a tube, which
is typically circular, but may have any shape.
In addition, when a damaged area on a tube is identified
before complete failure of the tube wall, it may be desirable
to determine the cause thereof in an attempt to -reduce -the
risk of further damage to the remaining tubes in the tube
bundle and thereby extend the life of the.tube bundle.
Determination of the cause of damage requires laboratory
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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/m1/3/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.