Abstract: An apparatus and associated method, for controlling signal passage, includes a first passageway for a first fluid, a second passageway for a second fluid, and an interposed chamber. A first, movable diaphragm at a first chamber junction and a second, movable diaphragm at a second chamber junction, with a third fluid bound there between and interposed between the first and second passageways. A device varies a volume of the third fluid bound between the diaphragms and thus moves the diaphragms. A movable member and a reservoir of the device are configured such that the movable member is sufficiently movable to increase the volume of the reservoir to remove a sufficient portion of the third fluid bound between the first and second diaphragms from the chamber to cause the first and second diaphragms to be pressed against the first and second walls, respectively.

Abstract: An overpressure protection system and methods of using the same are provided. The overpressure protection system can include at least two limiting diaphragms in fluid communication with corresponding overpressure diaphragms. Each limiting diaphragm can be configured to transmit pressure exerted by different fluid environments to their corresponding overpressure diaphragm. Each overpressure diaphragm can include a pre-tensioned diaphragm seal configured to allow transmission of pressures to a differential pressure sensing element, allowing measurement of a differential pressure between the different fluid environments. When pressure transmitted to an overpressure diaphragm reaches a pre-defined limit, the pre-tensioned diaphragm can inhibit transmission of further pressure increases to the differential pressure sensing element.

Abstract: Methods, systems, and devices are provided for controlling fluid flow in a pressure sensing system. A bi-directional valve can include a first capillary that can couple to a process fluid in a process fluid channel, and a second capillary that can couple to a pressure sensor. The first and second capillaries can include an interface therebetween for controlling fluid flow between the first and second capillaries. The interface region can be configured to allow fluid flow between the first and second capillaries when a magnitude of a pressure difference between the first capillary and the second capillary is less than or equal to a threshold pressure. The interface region can also be configured to prevent fluid flow between the first capillary and the second capillary when the magnitude of the pressure difference between the first capillary and the second capillary exceeds than the threshold pressure.

Abstract: A mass flow meter and methods for using the same are provided. The mass flow meter can include a tubular housing, a flexible plate, an actuator, and at least two sensors. The flexible plate can be coupled to an interior wall of the tubular housing such that the flexible plate can vibrate in torsion. The actuator can be configured to apply an oscillating torque to the flexible plate sufficient to vibrate the flexible plate in torsion. The at least two sensors can each be configured to measure oscillations of the flexible plate as a function of time at different locations. The mass flow meter can also include a computing device in electrical communication with the at least two sensors and configured to determine a mass flow of fluid passing through the tubular housing from a phase shift between oscillations of the flexible plate measured by the at least two sensors.

Abstract: An apparatus and associated method, for controlling signal passage, includes a first passageway for a first fluid, a second passageway for a second fluid, and an interposed chamber. A first, movable diaphragm at a first chamber junction and a second, movable diaphragm at a second chamber junction, with a third fluid bound there between and interposed between the first and second passageways. A device varies a volume of the third fluid bound between the diaphragms and thus moves the diaphragms. A movable member and a reservoir of the device are configured such that the movable member is sufficiently movable to increase the volume of the reservoir to remove a sufficient portion of the third fluid bound between the first and second diaphragms from the chamber to cause the first and second diaphragms to be pressed against the first and second walls, respectively.

Abstract: A mass flow meter and methods for using the same are provided. The mass flow meter can include a tubular housing, a flexible plate, an actuator, and at least two sensors. The flexible plate can be coupled to an interior wall of the tubular housing such that the flexible plate can vibrate in torsion. The actuator can be configured to apply an oscillating torque to the flexible plate sufficient to vibrate the flexible plate in torsion. The at least two sensors can each be configured to measure oscillations of the flexible plate as a function of time at different locations. The mass flow meter can also include a computing device in electrical communication with the at least two sensors and configured to determine a mass flow of fluid passing through the tubular housing from a phase shift between oscillations of the flexible plate measured by the at least two sensors.

Abstract: A system and associated method for monitoring pressure of water at a sub-surface water location. The system includes a chamber, enclosing a fluid, and a fluid line. The system includes a differential pressure sensor with first and second fluid pressure inputs connected to the chamber and the fluid line, respectively. The system includes a first valve configured to have a first position in which the chamber is in fluid communication with the fluid line through the first valve and configured to have a second position in which the chamber is blocked from fluid communication with the line. The system includes a second valve configured to have a first position in which the fluid line is blocked from fluid communication with the water at the sub-surface location and is configured to have a second position in which the line is in fluid communication with the water through the second valve.

Abstract: A system is provided for facilitating the removal/replacement components in a high pressure process fluid system and includes a retrieval plug having a first end portion disposed within a first cavity of a process fluid conduit and a second end disposed within a second cavity of a blind flange, the first cavity exposed to the pressure environment of the process fluid, and a cap disposed between the blind flange and the second end portion of the access plug. The access plug is configured to transfer an indicated pressure from the first end portion to the second end portion and the cap is configured to transfer the indicated pressure to a pressure measurement sensor disposed remotely of the access plug.

Abstract: An apparatus and associated method, for controlling signal passage, includes a first passageway for a first fluid, a second passageway for a second fluid, and an interposed chamber. A first, movable diaphragm at a first chamber junction and a second, movable diaphragm at a second chamber junction, with a third fluid bound there between and interposed between the first and second passageways. A device varies a volume of the third fluid bound between the diaphragms and thus moves the diaphragms. A movable member and a reservoir of the device are configured such that the movable member is sufficiently movable to increase the volume of the reservoir to remove a sufficient portion of the third fluid bound between the first and second diaphragms from the chamber to cause the first and second diaphragms to be pressed against the first and second walls, respectively.

Abstract: A mass flow meter and methods for using the same are provided. The mass flow meter can include a tubular housing, a flexible plate, an actuator, and at least two sensors. The flexible plate can be coupled to an interior wall of the tubular housing such that the flexible plate can vibrate in torsion. The actuator can be configured to apply an oscillating torque to the flexible plate sufficient to vibrate the flexible plate in torsion. The at least two sensors can each be configured to measure oscillations of the flexible plate as a function of time at different locations. The mass flow meter can also include a computing device in electrical communication with the at least two sensors and configured to determine a mass flow of fluid passing through the tubular housing from a phase shift between oscillations of the flexible plate measured by the at least two sensors.

Abstract: Methods, systems, and devices are provided for protecting a flexible member, such as a cable, tube, capillary, fiber, and other similar structures. In an exemplary embodiment, a modular device can include multiple modules that are configured to engage a flexible member. Each module can be configured to couple to a flexible member by an interference fit and to removably mate to another module. Once assembled, the modules can allow movement in a particular direction to allow some flexion of a flexible member extending therethrough.

Abstract: Methods, systems, and devices are provided for controlling fluid flow in a pressure sensing system. A bi-directional valve can include a first capillary that can couple to a process fluid in a process fluid channel, and a second capillary that can couple to a pressure sensor. The first and second capillaries can include an interface therebetween for controlling fluid flow between the first and second capillaries. The interface region can be configured to allow fluid flow between the first and second capillaries when a magnitude of a pressure difference between the first capillary and the second capillary is less than or equal to a threshold pressure. The interface region can also be configured to prevent fluid flow between the first capillary and the second capillary when the magnitude of the pressure difference between the first capillary and the second capillary exceeds than the threshold pressure.

Abstract: A temperature sensor for measuring a temperature within a subsea installation includes a fixture portion coupled to the subsea installation and a retrievable portion that is selectively operable to couple to the fixture portion. The fixture portion includes a constant volume of a fluid disposed at a measurement point within the subsea installation. The retrievable portion includes a pressure sensing element operable to measure a pressure associated with the constant volume of fluid such that a temperature at the measurement point is determinable.

Abstract: An apparatus and associated method, for controlling signal passage, includes a first passageway for a first fluid, a second passageway for a second fluid, and an interposed chamber. A first, movable diaphragm at a first chamber junction and a second, movable diaphragm at a second chamber junction, with a third fluid bound there between and interposed between the first and second passageways. A device varies a volume of the third fluid bound between the diaphragms and thus moves the diaphragms. A movable member and a reservoir of the device are configured such that the movable member is sufficiently movable to increase the volume of the reservoir to remove a sufficient portion of the third fluid bound between the first and second diaphragms from the chamber to cause the first and second diaphragms to be pressed against the first and second walls, respectively.

Abstract: A temperature sensor for measuring a temperature within a subsea installation includes a fixture portion coupled to the subsea installation and a retrievable portion that is selectively operable to couple to the fixture portion. The fixture portion includes a constant volume of a fluid disposed at a measurement point within the subsea installation. The retrievable portion includes a pressure sensing element operable to measure a pressure associated with the constant volume of fluid such that a temperature at the measurement point is determinable.

Abstract: An apparatus, for controlling signal passage, includes a first passageway for a first fluid, a second passageway for a second fluid, and an interposed chamber. A first, movable diaphragm at a first chamber junction and a second, movable diaphragm at a second chamber junction, with a third fluid bound there between and interposed between the first and second passageways. A device varies a volume of the third fluid bound between the diaphragms and thus moves the diaphragms. The diaphragms each have at least one position that permits passage of a pressure signal between the first fluid in the first passageway and the second fluid in the second passageway through the third fluid bound between the diaphragms. The diaphragms each have at least one position that prohibits passage of a pressure signal.

Abstract: A system and associated method for monitoring pressure of water at a sub-surface water location. The system includes a chamber, enclosing a fluid, and a fluid line. The system includes a differential pressure sensor with first and second fluid pressure inputs connected to the chamber and the fluid line, respectively. The system includes a first valve configured to have a first position in which the chamber is in fluid communication with the fluid line through the first valve and configured to have a second position in which the chamber is blocked from fluid communication with the line. The system includes a second valve configured to have a first position in which the fluid line is blocked from fluid communication with the water at the sub-surface location and is configured to have a second position in which the line is in fluid communication with the water through the second valve.

Abstract: The present invention relates to a retrievable pressure sensor for in situ measurement of pressure in a process fluid in a pipe/chamber. The pressure sensor comprising a pressure-transferring device and an outer sensor part having a pressure sensing element attached at a distance from the pipe/chamber where the pressure is to be measured. The pressure-transferring device comprises a first device for sealing attachment in an opening in a wall of the pipe/chamber where the pressure is to be measured, and has a first separation diaphragm for separating between the process fluid and the pressure-transferring fluid. The pressure-transferring device further comprises a second device for attachment at a distance from the pipe/chamber where the pressure is to be measured. The pressure-transferring device comprises a first cavity with a pressure-transferring fluid, wherein the first cavity comprising a capillary tube for pressure transferring connection between the first device and the second device.

Abstract: An apparatus, for controlling signal passage, includes a first passageway for a first fluid, a second passageway for a second fluid, and an interposed chamber. A first, movable diaphragm at a first chamber junction and a second, movable diaphragm at a second chamber junction, with a third fluid bound there between and interposed between the first and second passageways. A device varies a volume of the third fluid bound between the diaphragms and thus moves the diaphragms. The diaphragms each have at least one position that permits passage of a pressure signal between the first fluid in the first passageway and the second fluid in the second passageway through the third fluid bound between the diaphragms. The diaphragms each have at least one position that prohibits passage of a pressure signal.

Abstract: A temperature sensor for measuring a temperature within a subsea installation includes a fixture portion coupled to the subsea installation and a retrievable portion that is selectively operable to couple to the fixture portion. The fixture portion includes a constant volume of a fluid disposed at a measurement point within the subsea installation. The retrievable portion includes a pressure sensing element operable to measure a pressure associated with the constant volume of fluid such that a temperature at the measurement point is determinable.