초록 ▼

A safety device for sensing and monitoring pressure in oil or gas wellheads, flow lines, manifolds, pipelines, and the like, as well as other pressure vessels or apparatus requiring pressure sensing and monitoring, includes a pilot device having a transducer in operative communication with the sourc

A safety device for sensing and monitoring pressure in oil or gas wellheads, flow lines, manifolds, pipelines, and the like, as well as other pressure vessels or apparatus requiring pressure sensing and monitoring, includes a pilot device having a transducer in operative communication with the source of pressure to be sensed or monitored; the transducer producing an electrical signal proportional to the magnitude of the pressure sensed. The pilot device further includes an electronic circuit which is adjustable to provide predetermined upper and lower values representing a range of magnitudes of pressure. The electronic circuit includes a memory circuit which permits the pilot device to indicate that an out-of-range pressure has been or is being sensed. The safety device also includes a means for visibly indicating the present value of pressure being sensed as well as out-of-range pressure conditions that may have occurred previously. The electronic circuitry produces a signal representing the condition of the pressure being sensed, which signal may be directed to the wellhead or other pressure vessel safety system to permit appropriate remedial action to be taken if necessary.

대표청구항 ▼

A safety device for monitoring and controlling the pressure in a pressure vessel comprising, in combination, a pilot device in operative engagement with the pressure vessel, a transducer mounted on the pilot device and communicating with the pressure vessel to sense the magnitude of the pressure wit

A safety device for monitoring and controlling the pressure in a pressure vessel comprising, in combination, a pilot device in operative engagement with the pressure vessel, a transducer mounted on the pilot device and communicating with the pressure vessel to sense the magnitude of the pressure within the pressure vessel, a source of power for the transducer, an amplifier electrically connected with the transducer to amplify electrical signals received therefrom, a first potentiometer adjustable to provide a first reference voltage corresponding to an upper limit of pressure desired in the pressure vessel, a second potentiometer adjustable to provide a second reference voltage corresponding to a lower limit of pressure desired in the pressure vessel, a first comparator circuit electrically connected with the first potentiometer and the transducer amplifier to compare the signals received therefrom and to provide a signal representing the magnitude of the pressure in the pressure vessel, a second comparator circuit electrically connected with the second potentiometer and the transducer to compare the signals received therefrom and to provide a signal representing the magnitude of the pressure in the pressure vessel, a gate receiving the output signal from the comparator circuits, a memory circuit for storing the signals received from the comparator circuits through the gate, a visual indicator electrically connected to the gate to receive the output of the comparator circuits for providing a visual display of the magnitude of the pressure in the pressure vessel; and including a circuit for controlling the operation of the visual display, the circuit being electrically connected to the memory circuit and the gate, a manually operable switch electrically connected to the memory circuit and the control circuit whereby operation of the manual switch in a first mode permits the visual display to indicate the present magnitude of pressure in the pressure vessel and operation of the switch in a second mode permits the visual display to indicate a prior magnitude of pressure in the pressure vessel when the signals stored in the memory circuit correspond to the magnitude of pressure above or below the predetermined desired levels or pressure in the pressure vessel.