Other

James T Stewart

David C Toalson

George M Savage

Paul C Koomey

A crane load detection system is provided having an electronic strain gage located in series with the deadline of the boom and located adjacent the gantry tie-down of the deadline of the boom. A pendulum potentiometer and transmitter are provided on the boom adjacent its pivot point. A microprocessor is employed to solve several triangles using trigonometric functions to calculate the radius of rotation, the actual weight of the load and the percent of the load as compared to the maximum load for which the crane is designed.

Crane load instrument and method therefor

A crane load detection system is provided having an electronic strain gage located in series with the deadline of the boom and located adjacent the gantry tie-down of the deadline of the boom. A pendulum potentiometer and transmitter are provided on the boom adjacent its pivot point. A microprocessor is employed to solve serial triangles using vector analysis and trigonometric functions to calculate the radius of rotation, the actual weight of the load and the percent of the load as compared to the maximum load for which the crane is designed.

A position and seal or packing wear indicator for mechanical flow controlling devices such as valves and blowout preventers. For blowout preventers the system includes ultrasonic sensors for each ram and annular blowout preventer of a blowout preventer stack. Each of the ultrasonic sensors is positioned within the wall structure of the valve or blowout preventer and is recessed with respect to the inner wall surface such that a desired echo thereof occurs at the plane of the inner wall surface, thereby rendering the electronic signal processing system capable of accurately and positively sensing the precise positions of the flow controlling devices at all times. Electrical signals from the ultrasonic sensors are converted by an electronic signal conditioner to a usable interface format for transmission through a multi-conductor cable system to a remotely located computer. The computer includes software which generates on its CRT a graphical display of the respective positions of the flow controlling devices. The position detection capability provided by precision spacing of the ultrasonic sensors from the inner wall surface develops sufficient position indicating accuracy that detection of seal or packing wear can be identified. The computer also includes a printer for printing out data such as position indicating data or the graphical display of the CRT and also includes a data port for transmission of data to remote locations via microwave.

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Spring, TX, United States of America

James T Stewart