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Method of installing an interior by-pass liner
| Details |
Inventors: Di Giovanni, Bernard A.; Ciminiello, Francisco J.;
Assignee:
Primary Examiner: Bryant, III; James E.
Assistant Examiner:
Attorney, Agent or Firm: Brooks, Haidt, Haffner & Delahunty
Interior by-pass for underground gas service line is installed from building basement without need for excavation, and has a tightenable adapter attached on each end of the by-pass tubing to connect and seal the tubing to the interior periphery of the service line. Each adapter provides a pair of spaced-apart expanded sealing gaskets between the tubing and the service line, and a gas-leakage passage extending from the interior of the tubular adapter to the exterior spacing between the adapter gasket pair. Temporary gas-tight plugs are provided at respective locations between each leakage passage and the adjacent end of the by-pass tubing, and compressed natural gas test-pressure is applied within the tubing. Via both of the referred to leakage passages, the test pressure is exerted against all of the gasket seals to confirm gas-tightness thereof. Techniques are described for installing each adapter and the by-pass tubing, working only from the service end of the line, including installation of the service end adapter prior to the blind end adapter; the use of temporary gas-inflation bags to permit installation of the by-pass in the face of service gas flow; and structures on each adapter to fully expand the innermost gasket of each pair before the outermost gasket is expanded. |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS These and other objects, features and advantages of the present invention will become apparent from the following detailed description of the invention, when taken together with the accompanying drawings in which: FIG.
1 is a fragmented and cross-sectional elevation of a gas service line in which a by-pass liner tubing is being installed in accordance with the present invention; FIGS.
2 and 3 are similar views showing eariler steps during the installation; FIGS.
4, 5 and 6 are enlarged cross-sectional views of only the service head end adapter connection, illustrating a sequence of three stages in its installation; FIGS.
7, 8 and 9 are views similar to FIGS.
4-6, but illustrating three sequential stages during the installation of the blind end adapter; FIG.
10 is a perspective showing, to a smaller scale, of connections made between short lengths of rod to form a longer rod to be used during installation of the blind end adapter; FIG.
11 is a cross-sectional and somewhat diagrammatic illustration of the method of testing the installation of FIG.
1; FIG.
12 is an enlarged fragmentary cross-sectional showing of the engagement between the gas pressure test tool and the service end adapter during the test, to further illustrate how testing of the installation is performed; FIG.
13 is an enlarged cross-sectional view of a modified form of endcap which may be used on the blind end adapter in accordance with the invention; and FIG.
14 is a cross-sectional showing of still another modification of the blind end adapter as may be used.
Referring to FIG.
1, in a conventional gas service distribution network a gas main 20 lies buried in the ground under a street generally indicated by numeral 21.
A service line connection tee 22, of steel or other material, is connected as by threads 23 to the top of the gas main 20, the connection tee having a threaded cap 24 on its upper end.
A gas service line 25, made of similar steel pipe, extends some 25' to 50' underground from the connection tee 22 into the basement area, generally indicated by reference numeral 26, of a building whose concrete foundation wall and flooring are respectively indicated by reference numerals 27 and 28
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