초록 ▼

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 sp

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 servce 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 structure on each adapter to fully expand the innermost gasket of each pair before the outermost gasket is expanded.

대표청구항 ▼

A fitting for a blind liner assembly for service pipes, with the fitting having fixed attachment to one end of the liner wherein the improvement comprises: (a) a hollow adapter having an externally threaded boss extending axially from one side thereof and of a diameter less than said adapter, (b) an

A fitting for a blind liner assembly for service pipes, with the fitting having fixed attachment to one end of the liner wherein the improvement comprises: (a) a hollow adapter having an externally threaded boss extending axially from one side thereof and of a diameter less than said adapter, (b) an annular shoulder extending between the different diameters of said adapter and said boss and facing away from said boss, (c) a first sealing gasket mounted on said adapter adjacent to said shoulder, (d) a hollow compression head having one end of a diameter equal to said adapter and internally threaded so as to be threaded upon said boss to radially expand the same about said shoulder, (e) said compression head having its opposite end provided with an externally threaded boss of a diameter equal to said threaded boss provided by said adapter, (f) said compression head providing a second annular shoulder extending between the different diameters of its ends, (g) a second gasket mounted on said annular shoulder provided by said compression head, and (h) a compression nut internally threaded so as to be threaded upon said threaded boss of said compression head to radially expand the same about said shoulder provided by said compression head.