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To detect methane gas leaks early in the production of methane hydrate, a dissolved methane sensor to sense changes in the dissolved methane concentration in seawater with a high response is necessary. It was suggested that the standard METS sensor that Franatech GmbH of Germany has made available in the market would meet the requirement of such a sensor with its enhanced response as a result of improvements...
This paper describes the development of a dissolved methane sensor that will be used for the methane leakage monitoring in the methane hydrate production in Japan in the future. As for the requirements for the sensor, continuous, longtime use in a great water depth, real-time measurement, and outstanding response to the change of dissolved methane concentration are given. A commercially produced dissolved...
The authors developed a new drill holder which is able to sense excessive thrust and/or torque on a drill and to pull the drill back before it breaks. The holder has two sets of tongues, the relative distance of which varies mechanically when excessive force is applied to the drill. When a predesignated distance is exceeded, a signal is sent to the controller, which stops drill feeding and pulls...
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