Abstract: Hydrogen sulfide evolution from asphalt or heavy fuel oil may be reduced or eliminated using an additive to act as a scavenger. Zinc, in conjunction with an additional metal selected from Fe, Mn, Co, Ni, Cr, Zr, when present in the form of nano-particles of an oxide, borate or carboxylate is an effective component is preventing or mitigating the evolution of hydrogen sulfide. The nano-particles may be used neat or as a dispersion. These metals may also be complexed and used in the form of a solution. Molybdenum, when used with one or both of Fe and Zn is also a useful in any of these forms for the same purpose.

Abstract: Hydrogen sulfide evolution from asphalt or heavy fuel oil may be reduced or eliminated using an additive to act as a scavenger. Zinc, in conjunction with an additional metal selected from Fe, Mn, Co, Ni, Cr, Zr, when present in the form of nano-particles of an oxide, borate or carboxylate is an effective component is preventing or mitigating the evolution of hydrogen sulfide. The nano-particles may be used neat or as a dispersion. These metals may also be complexed and used in the form of a solution. Molybdenum, when used with one or both of Fe and Zn is also a useful in any of these forms for the same purpose.

Abstract: An electronic engine protector including an electronic pressure transducer that produces variable voltage output in proportion to the differential pressure of the engine crankcase and the atmosphere. Circuitry is provided for selectively adjusting the pressure trip point which represents the faulted mode wherein the engine's fuel solenoid is turned off. Further, circuitry provides for a selectively adjustable time delay to prevent engine shut down due to momentary engine overloads, atmospheric phenomena, or other such temporary conditions that generate a false shut down signal.

Abstract: This invention relates to an articulated boom structure unit (15) adapted to be mounted on an ocean going lift barge (16) for maintenance of an offshore station (14), and having a platform (17) vertically movable relative to ocean floor engageable leg units (18); the boom structure (15) comprising a pedestal (23) mounted for rotation on the platform (17), with a first boom unit (26) pivotally mounted on the pedestal for vertical, pivoting movement, a mounting (29) supported on the outer end of the first boom unit (26) and held on a vertical axis, a second telescoping boom unit (32) connected at an inner end on said mounting (29) for movement in a horizontal plane, a third platform boom unit (33) mounted at an inner end to the outer end of the second boom unit (32) and having a parallelogram subassembly (34) as a part thereof movable upwardly and downwardly, and a personnel carrier (21) mounted on an outer end of the subassembly (34), which carrier (21) may be either a bucket or a work platform, with the carri

Abstract: A welding wire feeding apparatus with orbital mounting assembly for use in combination with an industrial manipulator of the type including a "Z" axis assembly from which there is dependingly supported an extended welding axis post for rotational movement about the "Z" axis. The improved welding wire feeding apparatus mounting assembly is rotatably mounted on the bottom of the "Z" axis or wrist assembly of the robot and is in communication with the extended axis post by a rubber-lined yoke so that the rotational movement of the orbital welding wire feeding apparatus is simultaneous with that of the extended welding post. As a result of a support bearing and the attachment through a rubber-lined yoke, no mass or stiffness coupling occurs between the wire feeding apparatus and the extended axis post so that the natural frequencies of the extended axis post remain unchanged.

Abstract: A computer controlled apparatus is disclosed for performing a series of laser machining operations on a work piece in an environment comprised of a non-reactive gas with respect to the material of which the work piece is made. The computer controlled apparatus includes a machining chamber for receiving the work piece and means in the form of a pump for directing the non-reactive gas into the machining chamber at a controlled, selected rate. A laser beam is generated by a laser and is focused into a beam along a path to the work piece. An assembly is provided for selectively moving the machining chamber and its work piece therein through a sequence of steps, whereby the relative position between the work piece and the laser beam is changed such that a series of lasing operations and, in particular, welds may be effected on a sequence of selected sites of the work piece.

Abstract: Laser machining a work piece in an environment that is non-reactive to the material of which the work piece is made. In particular, the laser machining apparatus includes a chamber for readily receiving a work piece and means for moving the work piece along its X, Y, and Z axes with respect to the laser beam, while maintaining the purity of the machining environment. To this end, the machining chamber is mounted upon means for driving the machining chamber along X and Y axes. The machining environment is maintained within the machining chamber and a sealing means taking the form of a plate having a substantially flat surface, that is disposed of a substantially uniform distance from the peripheral edge of the machining chamber, so that the machining chamber may be driven without resistance by the moving means.

Abstract: A laser machining apparatus is disclosed as including a bed lying on a floor surface for supporting a source of a laser beam with respect to a work piece supported upon the bed. The bed is of a rigid construction and defines a substantially planar, reference surface for supporting at least one machining chamber for receiving and establishing about the work piece an environment that is non-reactive to the material of which the work piece is made. A work piece housing is fixedly attached to the reference surface for defining a second, substantially planar sealing surface with respect to the reference surface. An adjusting mechanism in the illustrative form of a finely threaded screw serves to accurately position the machining chamber and in particular a peripheral flange thereof to provide a uniform gap between the peripheral flange and the sealing surface in a manner to permit ready movement of the machining chamber with respect to the sealing surface.

Abstract: This invention provides shielded access to the irradiated heat exchanger tube bundle of a nuclear steam generator contained within a cask after removal from the generator. This tube bundle must be reduced in size and confined for removal from the containment building through hatchways of generally limited size. Access to the enclosed bundle is at the flanged joints of adjacent sections forming the cask and which are vertically separated to permit an oxygen lance to be inserted therein for burning the tubes at that level. A rotatably supported annular seal ring covers the separation and shields against the escape of radiation or irradiated material during the burning process. The ring provides access ports through which roller supports are mounted on the cask and provide access of the cutting tool to the tubes. Rotation of the ring on the rollers permits the tool to be inserted completely around the cask.

Abstract: A method and apparatus for effecting within a nuclear power plant horizontal separation of the vertically-extending cylindrical wall of the shell of a steam generator by an accurate cutting technique that generates a weld accommodating profile in preparation for subsequent rejoining. This is attained by progressive installation of horizontal hinged-section tension band assemblies around the shell, adding vertical anchor members clamped to the bands at circumferential intervals therearound, hanging and locking track support brackets onto the anchor members, assembly of a multiple-section rigidized circular track onto the support brackets and around the shell, vertically and radially adjusting and locking the track in place, roller mounting a carriage-supported milling machine assembly on the track, and taking a series of tapered milling cuts in the shell wall while the milling machine assembly is moved along the track by use of gear teeth thereon.