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 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 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 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: 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.

Abstract: Retrievable sensor devices and methods are provided that can be easily installed and removed from a sub-sea system without the need to stop the flow of working/process fluid. In particular, a retrievable sensor is provided that can be configured to be located remote from the process fluid to allow for easy access. In other embodiments, an actuator is provided that allows for pressure adjustments to be made during installation and/or removal of the sensor so as to avoid damage to the sensor and/or other system components and to avoid any process fluid/material leakage. Methods are also provided for installing/removing a retrievable sensor, as well as for adjusting a pressure of a retrievable sensor.

Abstract: Retrievable sensor devices and methods are provided that can be easily installed and removed from a sub-sea system without the need to stop the flow of working/process fluid. In particular, a retrievable sensor is provided that can be configured to be located remote from the process fluid to allow for easy access. In other embodiments, an actuator is provided that allows for pressure adjustments to be made during installation and/or removal of the sensor so as to avoid damage to the sensor and/or other system components and to avoid any process fluid/material leakage. Methods are also provided for installing/removing a retrievable sensor, as well as for adjusting a pressure of a retrievable sensor.