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Title: Subsea hydrocarbon sensor system

A hydrocarbon detection system is provided for use in a subsea hydrocarbon production installation which includes production tree assemblies, an electro-hydraulic control module located on the sea floor and remote from the production trees, cable assemblies interconnecting the control module with the production trees through magnetic coupling devices. A pair of inductive elements are electrically coupled by the surrounding sea water. Displacement of the conductive sea water by escaping hydrocarbons affects the coupling between the inductive elements to produce a hydrocarbon-presence-responsive output signal. The inductive elements are resonated within a selected frequency range by capacitors coupled with a primary inductor coil by auxiliary windings on a common core element. An excitation signal sweeps over the selected frequency range at a rate effective to produce a peak detected signal at the resonant frequency. The peak output signal is then monitored to form a control signal functionally related to the presence or absence of hydrocarbons in the sea water.
Authors:
;
Publication Date:
OSTI Identifier:
6148056
Report Number(s):
US 4282487
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 26 Sep 1979
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; HYDROCARBONS; DETECTION; LEAKS; LEAK DETECTORS; DESIGN; COUPLING; ELECTRIC CABLES; ELECTRIC CONDUCTIVITY; FREQUENCY RANGE; OFFSHORE OPERATIONS; SEA BED; SEAWATER; SIGNALS; CABLES; CONDUCTOR DEVICES; ELECTRICAL EQUIPMENT; ELECTRICAL PROPERTIES; EQUIPMENT; HYDROGEN COMPOUNDS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; WATER 423000* -- Engineering-- Marine Engineering-- (1980-)