초록 ▼

A method according to this invention employs a set of valves, a series of pressure checks, and a physical stop for verifying the closing of a locking system of a cylindrical passageway. The method may also employ an equalization piping. The valves isolate a tapping machine, a pipeline, and the equal

A method according to this invention employs a set of valves, a series of pressure checks, and a physical stop for verifying the closing of a locking system of a cylindrical passageway. The method may also employ an equalization piping. The valves isolate a tapping machine, a pipeline, and the equalization piping from one another so that product cannot flow from one to the other. The valves are then opened as a series of pressure checks are performed. A completion plug is then lowered into the passageway until the plug comes to rest within the passageway and is oriented so that a locking ring of the plug is in a filly expanded position. The expanded position is then confirmed by raising the plug until its upward travel is restricted. The plug is then released and pressure above the plug is reduced to 0 psi gauge.

대표청구항 ▼

What is claimed is: 1. A method for verifying closing of a locking system of a cylindrical passageway, the method comprising the steps of:equalizing a tapping machine pressure and a pipeline pressure by isolating the tapping machine from the pipeline so as to prevent a product flow from one to the o

What is claimed is: 1. A method for verifying closing of a locking system of a cylindrical passageway, the method comprising the steps of:equalizing a tapping machine pressure and a pipeline pressure by isolating the tapping machine from the pipeline so as to prevent a product flow from one to the other;lowering a completion plug having one or more locking rings into a cylindrical passageway of a pipeline until a downward travel of the completion plug is restricted;orienting the completion plug within the passageway so that the locking ring is in a fully expanded position; andraising the completion plug until its upward travel within the passageway is restricted, the passageway being connected to a tapping machine via a sandwich valve, the sandwich valve having an internal bypass valve.