Abstract: An apparatus and method for protecting a floating roof tank from the effects of a lightning strike are disclosed. In one aspect, the apparatus comprises an electrically conductive bonding strap in electrical communication with an inner tank wall and the floating roof located below liquid level, the bonding strap being of a length to minimize its self inductance, so as to provide a preferred electrically efficient path for conduction of lightning stroke current through an oxygen deficient environment.

Abstract: An apparatus includes a rotatably mounted magnetic rotor, a first coil mounted in proximity of the magnetic rotor, the first coil mounted such that, if the coil is flowing with electric current, the magnetic rotor is within immediate proximity of at least part of a magnetic field created by the coil. The apparatus includes a second coil mounted in proximity of the magnetic rotor, the second coil mounted such that, if the coil is flowing with electric current, the magnetic rotor is within immediate proximity of at least part of a magnetic field created by the coil. A current source is coupled to the first coil, for generating an AC signal and applying the AC signal across the first coil whereby an AC output signal develops across the second coil, the AC output signal having a magnitude that varies in relation to the rotational position of the rotor. A measuring circuit detects the AC output signal and develops therefrom a measure of the position of the rotor.

Abstract: An air core gauge method and apparatus are disclosed. The apparatus receives an input signal and comprises a gauge device and driver circuit for driving the gauge device. A detection circuit detects transitions in the input signal and provides a control output in response to detected transitions. A power control circuit, responsive to the control output, provides a 100% duty cycle power signal to the driver circuit during detected transitions and otherwise provides a power signal with a duty cycle less than 100% to the driver circuit so that the average power consumed by the gauge is reduced and the operating temperature of the gauge is reduced.

Abstract: Diesel exhaust particulates are efficiently trapped by incineration cleanable ceramic monolith porous wall filter elements. A number of arrangements for high efficiency elements having high filtration area in compact units are disclosed as are exemplary methods of construction.

Abstract: A fuel heat recovery system and control valve therefor for use in the fuel system of a diesel engine wherein the fuel system includes a fuel tank connected by a supply conduit means, including at least one fuel filter and a fuel pump to the engine. The fuel pump is used to supply fuel at a predetermined pressure to a plurality of fuel injectors of the engine, the fuel injectors also being connected to a fuel return conduit whereby fuel supplied to the injectors in excess of that injected by the injectors can be returned to the fuel tank, this excess or surplus fuel normally being heated by the engine. A temperature responsive fuel flow control valve is connected to the fuel return conduit upstream of the fuel tank and to the supply conduit between the fuel tank and the fuel filter whereby to control the flow of the heated surplus fuel for flow either back to the supply tank or back to the engine as a function of the temperature of fuel being supplied to the engine.