A plug for isolating and pressure testing a hollow piece of equipment (e.g., a container or tubular) comprises a compression nut, a semi-conical mandrel shaft (which may be one or two pieces), and a compression member. The compression nut and the semi-conical mandrel shaft are threaded together, directly or indirectly via a spacer and plug body, such that the rotation of the compression nut forces the mandrel shaft through the compression member, and the semi-conical surface expands the compression member against an interior surface of the hollow piece of equipment to anchor in place and seal off a testing space. Internal channels running through the compression nut (and if present, the plug body) permit externally pressurized fluid and sensors to communicate with the testing space. The compression member can be configured to test either one end of the piece of hollow equipment or a particular region between the two seals.

A plug for isolating and pressure testing a hollow piece of equipment (e.g., a container or tubular) comprises a compression nut, a semi-conical mandrel shaft (which may be one or two pieces), and a compression member. The compression nut and the semi-conical mandrel shaft are threaded together, directly or indirectly via a spacer and plug body, such that the rotation of the compression nut forces the mandrel shaft through the compression member, and the semi-conical surface expands the compression member against an interior surface of the hollow piece of equipment to anchor in place and seal off a testing space. Internal channels running through the compression nut (and if present, the plug body) permit externally pressurized fluid and sensors to communicate with the testing space. The compression member can be configured to test either one end of the piece of hollow equipment or a particular region between the two seals.

An assembly is provided for a fluid system. This fluid system assembly includes a fluid conduit and a plug. The fluid conduit has an internal bore. The internal bore is configured as or otherwise includes a smooth-walled internal bore. The plug includes a protrusion and a head. The protrusion is connected to the head. The protrusion projects axially along an axial centerline partially into the smooth-walled internal bore to a distal end of the plug. The head is seated against the fluid conduit. The head seals an opening in the fluid conduit to the internal bore.

A gripper assembly for a pipeline plug includes an actuator plate that includes at least two actuator wedges, a bowl that includes at least two bowl wedges, circumferential wedge sets, and gripper units. Each circumferential wedge set and gripper unit is positioned between the actuator plate and the bowl. Each circumferential wedge set includes a first circumferential wedge and a second circumferential wedge. Each circumferential wedge set is positioned such that an actuator wedge and a bowl wedge engage between the first and second circumferential wedges. Each gripper unit includes a gripper body positioned between and abutting a first circumferential wedge of a first circumferential wedge set and a second circumferential wedge of a second circumferential wedge set. Linear compression between the actuator plate and bowl causes circumferential movement of the circumferential wedges, which in turn causes radial expansion of the gripper units.

A device for clamping an element includes a pressure chamber having a flexible wall section with an elastic jacket and a rigid wall section that acts as a counter-bearing. The jacket is provided with a contact surface to connect with the element.

According to one embodiment a sealing plug is provided that includes an elastic body and a stem assembled coaxially with respect to one another. The elastic body is suitable for being expanded radially by pulling on the free end of the stem, which projects out of the elastic body, once it is inserted into the hole to be plugged, the elastic body applying a closing pressure against the hole. The sealing plug also comprises an empty space, arranged between the elastic body and the stem, which is communicated with the outside, such that the entrance of fluid into the elastic body is allowed so that the fluid applies pressure against the elastic body, thereby increasing the closing pressure applied by the elastic body against the hole.

A fluid end comprising a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section is releasably attached to a connect plate. Each connect plate is attached to a power source using a plurality of stay rods. Each fluid end section comprises a housing in fluid communication with a pair of intake manifolds and a discharge conduit. A fluid routing plug is installed within each housing and is configured to route fluid throughout the housing. A plunger is installed within stuffing box attached to each housing. A number of features, including the location of seals within bore walls and carbide inserts within valve guides, aid in reducing or transferring wear.

The tool comprises a front plate for closing the open end of a pipe. A pair of clamping devices are positioned around the pipe and frictionally engage its outer surface. Nut and bolt assemblies connect the front plate with the clamps. These assemblies pull the front plate tight against the pipe end face. A back plate is positioned transversely within the bore of the pipe. The plate has a stem that slidably projects forwardly through a central aperture in the front plate. The back plate carries an O-ring. A nut is threaded onto the stem and functions to draw the back plate forward so that the O-ring seals the interface of the front plate and pipe end face.

Disclosed embodiments include a suction pile vent plug having a cylindrically-shaped body having a sealing element, a plurality of coupling features, and a handle connected to the cylindrically-shaped body. The sealing element is configured to form a watertight seal with walls of a suction pile vent into which the vent plug is installed. The plurality of coupling features are configured to engage with corresponding coupling features of the suction pile vent. The movable handle is configured to be moved into one or more locked configurations. Disclosed embodiments further include a suction pile vent having a hollow cylindrically-shaped body having coupling features. The coupling features are configured to engage with corresponding coupling features of a suction pile vent plug to thereby mechanically couple the suction pile vent plug to the suction pile vent. Disclosed embodiments further include a fluidic port that fluidically couples a suction pile to a removable fluidic coupling.

Disclosed embodiments include a suction pile vent plug having a cylindrically-shaped body having a sealing element, a plurality of coupling features, and a handle connected to the cylindrically-shaped body. The sealing element is configured to form a watertight seal with walls of a suction pile vent into which the vent plug is installed. The plurality of coupling features are configured to engage with corresponding coupling features of the suction pile vent. The movable handle is configured to be moved into one or more locked configurations. Disclosed embodiments further include a suction pile vent having a hollow cylindrically-shaped body having coupling features. The coupling features are configured to engage with corresponding coupling features of a suction pile vent plug to thereby mechanically couple the suction pile vent plug to the suction pile vent. Disclosed embodiments further include a fluidic port that fluidically couples a suction pile to a removable fluidic coupling.