An isolation tool is described herein. In particular, a double isolation and bleed (DIB) isolation tool for use in line-stopping operations. The isolation tool may include a head unit, at least one groove around a circumference of the head unit, and a circumferential seal element disposed within each of the at least one grooves.

An isolation tool is described herein. In particular, a double isolation and bleed (DIB) isolation tool for use in line-stopping operations. The isolation tool may include a head unit, at least one groove around a circumference of the head unit, and a circumferential seal element disposed within each of the at least one grooves.

To provide a blocking device and method capable of safely blocking a fluid tube. A blocking device (1) that introduces a bag (50) into a fluid tube (1), and expands the bag (50) by pressure of fluid to block the inside of the fluid tube (50), the blocking device (1) including a cylinder (20) connectable to the fluid tube (1); a guide pipe (30) provided to be movable forward and backward in an axial direction of the cylinder (20) in the cylinder (20) and formed with a notch (32) for passing the bag (50) at a tip end; and a slide tube (40) inserted into the guide pipe (30) and provided to be movable forward and backward in the axial direction, and having a tip end portion connected to the bag (50) and a basal end portion connected to a fluid source (60) for expanding the bag (50); where the bag (50) is expanded in a state in which the guide pipe (30) is withdrawn from the fluid tube (1).

To provide a blocking device and method capable of safely blocking a fluid tube. A blocking device (1) that introduces a bag (50) into a fluid tube (1), and expands the bag (50) by pressure of fluid to block the inside of the fluid tube (50), the blocking device (1) including a cylinder (20) connectable to the fluid tube (1); a guide pipe (30) provided to be movable forward and backward in an axial direction of the cylinder (20) in the cylinder (20) and formed with a notch (32) for passing the bag (50) at a tip end; and a slide tube (40) inserted into the guide pipe (30) and provided to be movable forward and backward in the axial direction, and having a tip end portion connected to the bag (50) and a basal end portion connected to a fluid source (60) for expanding the bag (50); where the bag (50) is expanded in a state in which the guide pipe (30) is withdrawn from the fluid tube (1).

A method of using a pipe stopper to stop fluid flow through a pipeline includes providing the pipe stopper, the pipe stopper comprising an expandable stopper body and a pressure assembly, the expandable stopper body configurable in an expanded configuration and a contracted configuration, the pressure assembly configurable in an open configuration and a closed configuration and comprising a housing cavity; lowering the expandable stopper body of the pipe stopper into a pipe channel of the pipeline in the contracted configuration; orienting the pressure assembly in the open configuration, wherein an upper portion of the housing cavity is in fluid communication with an atmosphere external to the pipeline and a lower portion of the housing cavity is in fluid communication with the pipe channel; and biasing the expandable stopper body to the expanded configuration to block fluid flow through the pipe channel.

A method of using a pipe stopper to stop fluid flow through a pipeline includes providing the pipe stopper, the pipe stopper comprising an expandable stopper body and a pressure assembly, the expandable stopper body configurable in an expanded configuration and a contracted configuration, the pressure assembly configurable in an open configuration and a closed configuration and comprising a housing cavity; lowering the expandable stopper body of the pipe stopper into a pipe channel of the pipeline in the contracted configuration; orienting the pressure assembly in the open configuration, wherein an upper portion of the housing cavity is in fluid communication with an atmosphere external to the pipeline and a lower portion of the housing cavity is in fluid communication with the pipe channel; and biasing the expandable stopper body to the expanded configuration to block fluid flow through the pipe channel.

A pipe stopper includes an expandable stopper body defining a stopper cavity and configurable in an expanded configuration and a contracted configuration; a pressure assembly comprising a pressure housing and a piston, the piston slidably engaged with a housing cavity of the pressure housing, the piston operatively connected to the expandable stopper body; and a locking assembly comprising a locking rod and a locking device, a lower end of the locking rod disposed within the housing cavity, the locking rod further comprising a rod engagement mechanism, the locking device comprising a locking engagement mechanism; wherein the locking device is configurable in a locked configuration and an unlocked configuration, and wherein, in the locked configuration, the locking engagement mechanism engages the rod engagement mechanism to lock the expandable stopper body in the expanded configuration.

A pipe stopper includes an expandable stopper body defining a stopper cavity and configurable in an expanded configuration and a contracted configuration; a pressure assembly comprising a pressure housing and a piston, the piston slidably engaged with a housing cavity of the pressure housing, the piston operatively connected to the expandable stopper body; and a locking assembly comprising a locking rod and a locking device, a lower end of the locking rod disposed within the housing cavity, the locking rod further comprising a rod engagement mechanism, the locking device comprising a locking engagement mechanism; wherein the locking device is configurable in a locked configuration and an unlocked configuration, and wherein, in the locked configuration, the locking engagement mechanism engages the rod engagement mechanism to lock the expandable stopper body in the expanded configuration.

An isolation tool assembly for isolating a section of pipe includes a launcher, an adapter arrangement and an isolation tool. The launcher is configured to deploy and/or retrieve the isolation tool through a single opening in a wall of the pipe. The adapter arrangement is configured to couple a housing of the launcher to the pipe and a piston and a yoke of the launcher to the isolation tool via a linkage arrangement. The isolation tool includes a seal unit in the form of a seal module including annular primary and secondary seal elements. The seal module reconfigurable from a first configuration to a second, axially retracted, configuration, and movement of the seal module to the second, axially retracted, configuration urges the seal elements towards the wall of the pipe to isolate the section of pipe. The isolation tool includes a secondary activation arrangement configured to apply a force on an activating member of the primary activation arrangement to maintain the seal unit in the second configuration and maintain the isolation.

An isolation tool assembly for isolating a section of pipe includes a launcher, an adapter arrangement and an isolation tool. The launcher is configured to deploy and/or retrieve the isolation tool through a single opening in a wall of the pipe. The adapter arrangement is configured to couple a housing of the launcher to the pipe and a piston and a yoke of the launcher to the isolation tool via a linkage arrangement. The isolation tool includes a seal unit in the form of a seal module including annular primary and secondary seal elements. The seal module reconfigurable from a first configuration to a second, axially retracted, configuration, and movement of the seal module to the second, axially retracted, configuration urges the seal elements towards the wall of the pipe to isolate the section of pipe. The isolation tool includes a secondary activation arrangement configured to apply a force on an activating member of the primary activation arrangement to maintain the seal unit in the second configuration and maintain the isolation.