In situ repair of a failed compression fitting

Patent · Wed Jan 01 00:00:00 EST 1986

OSTI ID:865939

Wolbert, Ronald R ^[1]; Jandrasits, Walter G ^[2]

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1. McKees Rocks, PA
2. Pittsburgh, PA

A method and apparatus for the in situ repair of a failed compression fitg is provided. Initially, a portion of a guide tube is inserted coaxially in the bore of the compression fitting and locked therein. A close fit dethreading device is then coaxially mounted on the guide tube to cut the threads from the fitting. Thereafter, the dethreading device and guide tube are removed and a new fitting is inserted onto the dethreaded fitting with the body of the new fitting overlaying the dethreaded portion. Finally, the main body of the new fitting is welded to the main body of the old fitting whereby a new threaded portion of the replacement fitting is precisely coaxial with the old threaded portion. If needed, a bushing is located on the dethreaded portion which is sized to fit snugly between the dethreaded portion and the new fitting. Preferably, the dethreading device includes a cutting tool which is moved incrementally in a radial direction whereby the threads are cut from the threaded portion of the failed fitting in increments.

• Assignee: United States of America as represented by Department of Energy (Washington, DC)
• Patent Number(s): US 4603463
• OSTI ID: 865939
• Country of Publication: United States
• Language: English

Related Subjects

situ
repair
failed
compression
fitting
method
apparatus
fitg
provided
initially
portion
guide
tube
inserted
coaxially
bore
locked
therein
close
fit
dethreading
device
mounted
cut
threads
thereafter
removed
dethreaded
overlaying
finally
main
welded
whereby
threaded
replacement
precisely
coaxial
bushing
located
sized
snugly
preferably
cutting
tool
moved
incrementally
radial
direction
increments
radial direction
coaxially mounted
threaded portion
cutting tool
guide tube
situ repair
compression fitting
threaded fitting
failed compression
close fit
/29/30/408/