Abstract: An example computing device includes a prefix lookup module, and a Bloom filter that includes a set of queues. The prefix lookup module is configured to receive policy configuration information, examine a state of a queue of the set of queues, and determine whether to bypass the first Bloom filter based on the policy configuration information and the state of the queue. In one example, the prefix lookup module may be configured to, using the policy configuration information, determine to bypass the Bloom filter when the queue is full. In another example, the prefix lookup module may be configured to, using the policy configuration information, determine not to bypass the Bloom filter and send a lookup request to the Bloom filter upon determining that the queue is no longer full.

Abstract: A robust fastener locking device (10, 20) prevents loosening of a fastener (F) used to attach to two parts (P1, P2) together. A plate (12, 22) fits against a part and abuts against at least two adjacent sides (S1, S2) of the part. The plate has an opening (14, 24) therein sized for a bolt to be inserted through the opening with the head of the bolt, or the nut (N) bearing against the plate when the fastener is secured in place. A portion of the plate adjacent the opening is deformable about the fastener after the fastener is secured in place to prevent subsequent rotation of the fastener which would loosen the fastener. In one embodiment, tabs (30a-30c) are formed adjacent the opening and can be bent about the portion of the fastener. The tab is broken off if the fastener needs to be removed, but the locking device can be reused.

Abstract: A heat exchanger includes a number of fluid carrying tubes disposed in a hot gas flow path. One arrangement of heat exchanger tubes includes a plurality of finned serpentine tubes parallel to one another and connected to an inlet header and an outlet header. The present invention discloses a support for a serpentine tube arrangement and a method of construction for a non-contact heat exchanger.

Abstract: This invention relates to an optical system which will enable easy use in the field. Known systems either require sample and reference targets to be imaged within the same telescope field or do not enable accurate identification of the measuring field in a view finder.The present invention overcomes this problem by providing a system having a first branch (10, 12) and a second branch (14) which receive light from a sample and reference target respectively. A shutter 22 sequentially allows light from the two branches to pass to a mirror 20 having a slit 30, reflective portions 32 and transparent portions 34. Light from the first branch passes through portions 30 and 34 to a detecting branch (42, 46, 50-56) and some light is reflected through a lens 16 to eye piece 19. Similarly some light from the second branch passes through mirror 30 and 34 to eye piece 19 and some light is reflected to the detecting branch.

Abstract: In a non-contact heat exchanger such as a heat recovery steam generator, the performance efficiency is dependent upon full utilization of the available hot gas flow. In a heat recovery steam generator, hot gas is channeled past fluid carrying tubes whereby the tube-side fluid (water) is heated into steam. It has been discovered that gas flow along the heat exchanger sidewalls results in an unacceptable heat loss and that this loss may be corrected by the use of sidewall baffles so constructed as to obviate any alignment difficulty.

Abstract: In a hot gas duct wherein it is desirable to retain heat within the duct by insulated sidewalls and wherein the duct is substantially longer than it is wide, it is necessary to support the duct against excessive deformation in the lateral direction. Exterior support structures are unacceptable because locating cross members or struts becomes problematic. Interior support structures must be carefully designed so as not to inhibit thermal expansion and contraction within the duct. It is proposed that a lateral bracing system or truss be disposed entirely inside the hot gas path and provision be made to ensure adequate facility for uniform expansion of the truss within the hot gas duct.

Abstract: In a counterflow non-contact heat exchanger, tube bundles carry fluid back and forth across a hot gas path. As the fluid in the tubes flows vertically downward the temperature of the fluid rises. As the gas rises in the heat exchanger it loses heat due to the heat exchange process. This means that the temperature profile of a tube bundle will show a greater thermal expansion in the lower tubes. The present invention seeks to provide an efficient and improved support arrangement for heat exchanger tubes to accommodate this phenomenon by supplying a pivotally mounted tube support plate which will rotate and translate slightly from a substantially vertical plane to accommodate thermal expansion. Further, if there are multiple tube bundles, additional tube support plate sections will allow a tube support plate to articulate in sections to accommodate thermal movement.

Abstract: This is a method and apparatus for controlling an oil-well beam pumping unit in a manner which allows increased oil production. The AC electric motor of the beam pumping unit is supplied power through a variable frequency power supply, whose frequency (and voltage) is controlled by circuitry to automatically adjust to whatever flow enters the wellbore by varying the speed of the pumping unit to maintain the speed generally proportional to the real power consumed by the pump. As the level in the wellbore can be maintained at an essentially constant minimum level, despite the relatively large hour-to-hour variations in in-flow which normally occur, the total flow from the formation into the wellbore in a given period of time is increased.

Abstract: This is a method and apparatus for controlling a downhole, hydraulically actuated pump. Two fluid flow monitoring means generate signals which are a function of the power fluid flow rate to the downhole pump and the return fluid flow rate from the well. An automatic controller causes the power fluid flow rate to be maintained essentially directly proportional to the return flow. Thus, the power fluid flow is not varied in the opposite direction of any change in return flow to maintain the return fluid flow constant, but conversely, is changed in a manner which will tend to accentuate any changes in the return fluid flow.

Abstract: This invention is a hydraulic pumping unit which uses a cyclone feed pump means to vary the speed of the above-ground pump, while still providing proper cleaning of the power fluid for the downhole pump. The ability to conveniently change the speed of the above-ground pump allows the speed of the pump to be reduced whenever well conditions make such a reduction appropriate, and this provides a very substantial reduction in the cost of power for the prime mover (typically an electric motor). In addition to the cyclone feed pump and a speed control means to vary the speed at which the prime mover drives the above-ground pump, this invention uses a flowback line connected from the cyclone overflow to the feed pump inlet.

Abstract: This is a method and apparatus for a control system for a well-fluid hydraulic pumping unit. The system senses level in the suction vessel and operates an underflow throttling valve to control both the level in the suction vessel and the flows of the cyclone separator. The system maintains the level in the horizontal suction vessel and simultaneously maintains flows to the cyclone in a range for effective cleaning of the fluid and for self-cleaning of the underflow. The cyclone and its associated hardware are sized based on the above-ground pump flow and any bleed flow from the suction vessel. The system is generally applicable to hydraulic units in which the speed of the above-ground pump is not varied over a wide range.