A dam for use with a duct having a longitudinal axis. The dam employs a single piece insert having a first lateral flange and a second lateral flange configured to engage opposing interior lateral surfaces of the duct. The insert engages the duct in sealing contact in a seated position. The first and second lateral flanges are offset longitudinally along the longitudinal axis and joined with a curved wall having a curvature shaped to be received, with the insert oriented at an insert angle about a normal axis perpendicular to the longitudinal axis, in an aperture in the duct.

A pipeline plug includes a pressure head; a seal assembly; a seal expansion ring; a plurality of gripper bodies, a sliding gripper, and an actuator. Each gripper body is coupled to the seal expansion ring. Radial expansion of the gripper bodies supports radial expansion of the seal expansion ring. Additionally, radial expansion of the seal expansion ring supports radial expansion of the gripper bodies. The sliding gripper is slidingly coupled to a radially outer surface of the gripper body.

The present disclosure provides an isolation tool for isolating a section of pipe or a vessel and methods for isolating a section of a pipe or a vessel. In particular, the present disclosure provides a double isolation and bleed (DIB) isolation tool, for use in line-stopping operations and methods of line isolation employing the isolation tool.

The present disclosure provides an isolation tool for isolating a section of pipe or a vessel and methods for isolating a section of a pipe or a vessel. In particular, the present disclosure provides a double isolation and bleed (DIB) isolation tool, for use in line-stopping operations and methods of line isolation employing the isolation tool.

A cut warning system can include a valve sleeve defining a cavity, the valve sleeve defining a bottom sealing surface within the cavity; a pipeline extending through the cavity; a drilling machine including a shell cutter, the shell cutter defining a bottom edge, the drilling machine configured to axially advance the shell cutter from a pre-engagement position towards the bottom sealing surface, the pipeline positioned between the shell cutter and the bottom sealing surface in the pre-engagement position; and a signaling element positioned within the cavity, the signaling element configured to produce a signal when the shell cutter reaches a post-engagement position, the bottom edge being axially positioned between the pipeline and the bottom sealing surface.

A cut warning system can include a valve sleeve defining a cavity, the valve sleeve defining a bottom sealing surface within the cavity; a pipeline extending through the cavity; a drilling machine including a shell cutter, the shell cutter defining a bottom edge, the drilling machine configured to axially advance the shell cutter from a pre-engagement position towards the bottom sealing surface, the pipeline positioned between the shell cutter and the bottom sealing surface in the pre-engagement position; and a signaling element positioned within the cavity, the signaling element configured to produce a signal when the shell cutter reaches a post-engagement position, the bottom edge being axially positioned between the pipeline and the bottom sealing surface.

A machine includes a tool housing defining a housing cavity; a first tool coupled to a first linear drive mechanism, the first tool linearly repositionable along an axis by the first linear drive mechanism about and between a first retracted position and an extended position, the first tool positioned within the housing cavity in the first retracted position, the first tool positioned external to the housing cavity in the extended position; and a second tool coupled to a second linear drive mechanism, the second tool linearly repositionable along the axis by the second linear drive mechanism about and between a second retracted position and a sealing position, the second tool positioned within the housing cavity in the second retracted position, the second tool positioned external to the housing cavity in the sealing position.

A machine includes a tool housing defining a housing cavity; a first tool coupled to a first linear drive mechanism, the first tool linearly repositionable along an axis by the first linear drive mechanism about and between a first retracted position and an extended position, the first tool positioned within the housing cavity in the first retracted position, the first tool positioned external to the housing cavity in the extended position; and a second tool coupled to a second linear drive mechanism, the second tool linearly repositionable along the axis by the second linear drive mechanism about and between a second retracted position and a sealing position, the second tool positioned within the housing cavity in the second retracted position, the second tool positioned external to the housing cavity in the sealing position.

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 valve stem define a stem fluid pathway, the valve stem movable between an open position and a closed position; wherein, in the open position, the stem fluid pathway is in fluid communication with the housing cavity and the expandable stopper body is movable to the expanded configuration, and in the closed configuration, the stem fluid pathway is not in fluid communication with the housing cavity and the expandable stopper body is movable to the contracted 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 valve stem define a stem fluid pathway, the valve stem movable between an open position and a closed position; wherein, in the open position, the stem fluid pathway is in fluid communication with the housing cavity and the expandable stopper body is movable to the expanded configuration, and in the closed configuration, the stem fluid pathway is not in fluid communication with the housing cavity and the expandable stopper body is movable to the contracted configuration.