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Title: In situ repair of a failed compression fitting

Abstract

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.

Inventors:
 [1];  [2]
  1. McKees Rocks, PA
  2. Pittsburgh, PA
Issue Date:
OSTI Identifier:
865939
Patent Number(s):
4603463
Assignee:
United States of America as represented by Department of Energy (Washington, DC)
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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/

Citation Formats

Wolbert, Ronald R, and Jandrasits, Walter G. In situ repair of a failed compression fitting. United States: N. p., 1986. Web.
Wolbert, Ronald R, & Jandrasits, Walter G. In situ repair of a failed compression fitting. United States.
Wolbert, Ronald R, and Jandrasits, Walter G. Wed . "In situ repair of a failed compression fitting". United States. https://www.osti.gov/servlets/purl/865939.
@article{osti_865939,
title = {In situ repair of a failed compression fitting},
author = {Wolbert, Ronald R and Jandrasits, Walter G},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

Patent:

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