A helical strake pole system that includes a tubular pole having a longitudinal axis and threaded attachment points. The system further includes a helical strake fin disposed circumferentially around a portion of the tubular pole along the longitudinal axis. The system further includes couplers disposed on the tubular pole. The couplers are configured such that each coupler has a first portion with a slot configured to receive an upper portion of the helical strake fin and a second portion configured to removably coupled to a threaded attachment point of the tubular pole. In addition, each coupler is configured to position a portion of the helical strake fin substantially perpendicular to a surface of the tubular pole.

Disclosed is an absorber system for absorbing pressure shocks and fluid volume shocks in a fluid system. In particular, the absorber system includes a housing with a joint for insertion within a fluid system, wherein the housing interior is in fluid communication with fluid in the fluid system. As such, when a pressure and/or fluid volume shock is developed within the fluid system, fluid is forced into the housing via the joint. A membrane is disposed within the housing in such a way that the fluid impacts the membrane which, in response, flexes to absorb and control the pressure and/or fluid volume shock within the fluid system. The absorber system, thus, controls pressure and/or fluid volume shock within a system and can prevent water hammer and other problems which can result from the development of pressure and/or fluid volume shock.

A fracturing system includes a plurality of junctions mounted on a chassis, such as a trailer chassis. Pressurized fluid is provided to the plurality of junctions via a plurality of conduits, e.g., from one or more pumps. The junctions and the conduits are independently mounted and independent vibration dampening systems damp vibrations at the individual mounts. Vibration of individual of the junctions may be damped by a first dampening system having first dampening properties and individual of the conduits may be damped by a second dampening system having second dampening properties different from the first dampening properties.

The invention relates to a coupling which includes at least: a tubular coupling member suitable for receiving a pipe and comprising one or more annular ribs, and a crimping ring arranged on the coupling member and translatably movable between a position for inserting the pipe into the coupling member, and a crimping position, in which the crimping ring immobilizes the pipe relative to the coupling member after the deformation of the one or more ribs. Recesses are formed between the coupling member and the pipe in the crimping position. The coupling has at least one exhaust opening arranged such as to provide fluid communication between said at least one recess and the outside of the coupling.

A hydraulic accumulator having a closing arrangement. The accumulator has a housing, a removable end cap, a segmented locking ring, and a pilot ring. The housing has at least one opening, an interior space, and a ring recess adjacent the opening. The removable end cap is sized to close the opening when in a closed position. The segmented locking ring is removably positioned within the ring recess adjacent the end cap opposite the interior space to stop the end cap from moving in a first direction away from the interior space. The locking ring may be segmented. The pilot ring is removably connected to the end cap and positioned to hold the locking ring in the ring recess when connected to the end cap.

A hydrostatic drive system is disclosed which allows for simpler and more robust control of hydraulic vibration. The system comprises first and second hydraulic drive units and a variable damping device. At least the first hydraulic drive unit is a variable displacement type and comprises a displacement control. The variable damping device comprises at least one variable element. The system comprises a first linkage apparatus between the displacement control and the variable element and is operable to control the variable element in accordance with the displacement of the displacement control.

A bicycle hydraulic hose cap comprises a hose attachment to be detachably attached to an end of a hydraulic hose, and a reservoir including a fluid chamber having a variable internal volume. The fluid chamber is connected to a fluid passageway of the hydraulic hose in an attachment state where the hose attachment is attached to the end of the hydraulic hose.

A bicycle hydraulic hose cap comprises a hose attachment to be detachably attached to an end of a hydraulic hose, and a reservoir including a fluid chamber having a variable internal volume. The fluid chamber is connected to a fluid passageway of the hydraulic hose in an attachment state where the hose attachment is attached to the end of the hydraulic hose.

There is provided a pressure oscillation damper in order to reduce the level of the pressure oscillations by the use of for a fluid extraction system. The pressure oscillation damper comprises a wall enclosing a main volume, at least two inlets, arranged in the wall and adapted to be connected to fluid extraction units, at least two outlets, arranged in the wall and adapted to be connected to pumping units, and at least one flexible member, arranged in the first volume so as to divide the first volume into at least two secondary volumes, each secondary volume forming a channel between the at least one inlet and at least one outlet, the flexible member being configured to bend toward a secondary volume having a lower pressure.

There is provided a pressure oscillation damper in order to reduce the level of the pressure oscillations by the use of for a fluid extraction system. The pressure oscillation damper comprises a wall enclosing a main volume, at least two inlets, arranged in the wall and adapted to be connected to fluid extraction units, at least two outlets, arranged in the wall and adapted to be connected to pumping units, and at least one flexible member, arranged in the first volume so as to divide the first volume into at least two secondary volumes, each secondary volume forming a channel between the at least one inlet and at least one outlet, the flexible member being configured to bend toward a secondary volume having a lower pressure.