Line test isolation plug

Claim 2

An isolation plug suitable for leakage testing of a liquid conduit by means of line test apparatus capable of pressurizing the liquid conduit, said liquid conduit being connected to the outlet of a fitting having a sleeve through which the liquid discharged from the fitting passes, said fitting having a threaded hole axially aligned with the sleeve, said isolation plug comprising: an elongated body having an exterior surface surrounding and defining the body in a direction parallel to its elongation, said surface extending between ends of said body;

Claim 3

sealing means on said exterior surface adjacent one end of said body, said sealing means surrounding said body and being adapted to mate with the sleeve in the fitting when said plug is inserted in the fitting through the threaded hole to seal off the outlet of the fitting from the remaining portions of the fitting; and thread means on said exterior surface of said body intermediate the ends of said body, said thread means mating with the threaded hole in the fitting when the plug is inserted in the fitting for retaining the plug in the fitting; said body having a passage extending therethrough, one end of said passage opening into the outlet of the fitting downstream of the seal formed between said sealing means and the sleeve, the other end of said passage opening on said body exteriorly of the fitting, the other end of said passage having means adapted to mate with the line test apparatus to permit pressurizing of the liquid conduit for testing purposes.

Claim 4

sealing means on said exterior surface adjacent one end of said body, said sealing means surrounding said body and being adapted to mate with the sleeve in the fitting when said plug is inserted in the fitting through the threaded hole to seal off the outlet of the fitting from the remaining portions of the fitting; and thread means on said exterior surface of said body intermediate the ends of said body, said thread means mating with the threaded hole in the fitting when the plug is inserted in the fitting for retaining the plug in the fitting; said body having a passage extending therethrough, one end of said passage opening into the outlet of the fitting downstream of the seal formed between said sealing means and the sleeve, the other end of said passage opening on said body exteriorly of the fitting, the other end of said passage having means adapted to mate with the line test apparatus to permit pressurizing of the liquid conduit for testing purposes.

Claim 5

The isolation plug according to claim 1 wherein said exterior surface is cylindrical.

Claim 6

The isolation plug according to claim 2 wherein said sealing means comprises O-ring sealing means.

Claim 7

The isolation plug according to claim 1 wherein said means at the other end of said passage adapted to mate with the line test apparatus comprises threads.

Claim 8

The isolation plug according to claim 1 wherein said passage extends through said body from one end of said body to the other end of said body.

Claim 9

The isolation plug according to claim 1 wherein said body contains an additional passage, one end of said additional passage opening into the fitting upstream of the seal formed between said sealing means and the sleeve, the other end of said additional passage opening on said body exteriorly of the fitting, said additional passage permitting transport of liquid out of the fitting.

Claim 10

The isolation plug according to claim 6 wherein the other end of said additional passage opens at an exposed end of said body.

Claim 11

The isolation plug according to claim 6 wherein the other end of said additional passage contains threads.

Claim 12

An isolation plug suitable for transporting liquid out of a fitting for a liquid conduit, said liquid conduit being connected to the outlet of the fitting, said fitting having a sleeve through which liquid discharged from the fitting passes and a threaded hole axially aligned with the sleeve, said isolation plug comprising: an elongated body having an exterior surface surrounding and defining the body in a direction parallel to its elongation, said surface extending between ends of said body; sealing means on said exterior surface adjacent one end of said body, said sealing means surrounding said body and being adapted to mate with the sleeve in the fitting when said plug is inserted in the fitting through the threaded hole to seal off the outlet of the fitting from the remaining portions of the fitting; and thread means on said exterior surface of said body intermediate the ends of said body, said thread means mating with the threaded hole in the fitting when the plug is inserted in the fitting for retaining the plug in the fitting; said body having a passage therein, one end of said passage opening into said fitting upstream of the seal formed between said sealing means and the sleeve, the other end of said passage opening on said body exteriorly of said fitting, said passage permitting transport of liquid out of said fitting.

Claim 13

An isolation plug suitable for transporting liquid out of a fitting for a liquid conduit, said liquid conduit being connected to the outlet of the fitting, said fitting having a sleeve through which liquid discharged from the fitting passes and a threaded hole axially aligned with the sleeve, said isolation plug comprising: an elongated body having an exterior surface surrounding and defining the body in a direction parallel to its elongation, said surface extending between ends of said body; sealing means on said exterior surface adjacent one end of said body, said sealing means surrounding said body and being adapted to mate with the sleeve in the fitting when said plug is inserted in the fitting through the threaded hole to seal off the outlet of the fitting from the remaining portions of the fitting; and thread means on said exterior surface of said body intermediate the ends of said body, said thread means mating with the threaded hole in the fitting when the plug is inserted in the fitting for retaining the plug in the fitting; said body having a passage therein, one end of said passage opening into said fitting upstream of the seal formed between said sealing means and the sleeve, the other end of said passage opening on said body exteriorly of said fitting, said passage permitting transport of liquid out of said fitting.

Claim 14

The isolation plug according to claim 9 including pressure relief means in said passage for relieving pressure in the liquid conduit.

Claim 15

The isolation plug according to claim 9 wherein said passage opens at an exposed end of the body.

Claim 16

The isolation plug according to claim 9 wherein said passage includes threads in the other end thereof.