Abstract: An anchor assembly for use with a tensioning strand includes an anchor body including a bore therethrough, the bore configured to receive the strand therethrough, an inner surface of the bore including a frustoconical wedge-receiving cavity, at least one frustoconical wedge including a strand-engaging inner surface and an anchor body engaging outer surface, the wedge being at least partially received in the wedge-receiving cavity, an encapsulating layer at least partially surrounding the anchor body, and a wedge retention disk mechanically coupled to the anchor body and positioned so as to prevent the wedge from fully exiting the wedge-receiving cavity. The wedge retention disk may be spaced apart from the anchor body such that the wedge can move axially with respect to the anchor body between a seated position in which the wedge engages the wedge-receiving cavity and an unseated position in which the wedge engages the wedge retention disk.

Abstract: A coupler for connecting first and second tendons may comprise a body including first and second ends, a passageway therethrough and an access port; first and second wedges each configured to receive an end of the first and second tendons, respectively, each of the wedges being positioned in the passageway and oriented so as to resist withdrawal from the coupler of a tendon received therein; and first and second pistons positioned within the passageway proximate the first and second wedges, respectively; wherein the first and second pistons define a pressure chamber therebetween; wherein the pressure chamber is in fluid communication with the access port; and wherein the first and second pistons are configured to bear on the first and second wedges, respectively, and urge the first and second wedges apart in response to pressure in the pressure chamber.

Abstract: A coupler may include a first chuck, the first chuck including an outer surface and first external threads and a second chuck, the second chuck including an outer surface and second external threads having a reverse orientation relative to the first external threads. The coupler may also include a coupler body including a first end, a second end, and a passageway extending between the first end and the second end, the first end secured to the first chuck, the second end secured to the second chuck, the first end including first internal threads engaging the first external threads, the second end including second internal threads engaging the second external threads.

Abstract: A method for forming a concrete anchor may comprise the steps of providing an anchor body, at least partially encapsulating the anchor body in a sealing cover, providing at least one tubular member, engaging an end surface of the tubular member against a surface of the sealing cover so as to weld the member to the sealing cover.

Abstract: A cover is provided for sealing a concrete anchor including a flange and a bore extending through the flange. The bore defines an axis and the flange has a first side and a second side. The cover includes a first cover portion for covering a portion of the anchor proximate the first side of the flange, a second cover portion for covering a portion of the anchor proximate the second side of the flange, and a latch coupling the first cover portion and the second cover portion together with the anchor disposed between the latch.

Abstract: Methods and devices for sealing and/or gripping concrete strengthening tendons. Some embodiments provide a method of forming a seal between an encapsulated anchor and a sheath of a tendon engaging the encapsulated anchor. Other embodiments provide a splice for forming a seal around a discontinuity in the sheath of a concrete tensioning tendon. Some embodiments provide a seal assembly for forming a seal between a tubular extension and a sheath of a tendon to protect an exposed portion of the tendon contained within the tubular extension. Some embodiments also provide a method of forming a fluid tight seal between tubular extension and a sheath of a tendon, while other embodiments provide a method of gripping the sheath of a tendon with a tubular extension to prevent the sheath from moving relative to the extension.

Abstract: A drilling mud clarification or reclamation system is provided. High gravity and low gravity solids are removed from the drilling mud in respective centrifugal separator stages. A plurality of in-line mass flow sensors are provided to provide real-time indication of the effectiveness of the clarification of the drilling mud, and to provide control signals to a central control station. The heavier weight components are separated from the mud and returned to the system for further use. The lighter weight components are removed and are discarded to clean the mud. A cuttings dryer is provided to remove oil from cuttings which have been separated from a shale shaker stage. A de-sludging centrifuge is also provided to remove very fine cuttings which may have a harmful effect on the viscosity of the mud.

Abstract: A purge system develops a positive pressure in an enclosure, with sufficient volumetric air flow to cool the electrical components. The system includes an air inlet hose, with the input into the inlet hose positioned in an unclassified (i.e. safe) area. The inlet hose couples to the suction of an air blower, which may be mounted inside or outside the enclosure, while the discharge of the air blower is inside the enclosure, thereby providing the necessary positive pressure (purge) within the enclosure. The air discharged from the air blower strikes a baffle, which distributes the blowing air throughout the bottom of the enclosure. The distributed air is then drawn into controller cabinets by dedicated cooling fans. A conduit system connects the controller cabinets to take the now heated air from the cabinets to a discharge outside the enclosure. The outlet of the conduit system may include a counter-weighted flapper valve to maintain the pressure within the enclosure.

Abstract: A method and apparatus are provided for receiving the solids discharge of a centrifuge, shaker, or other clarification system and further drying the solids discharge. The influent into the apparatus of the invention is in the form of a slurry, such as for example the solids discharge of a shaker or centrifuge in a drilling mud clarification system. The apparatus comprises a horizontal screen rotated at a high rate of speed to remove liquid from the slurry by centrifugal force. The horizontal screen is retained by a squirrel cage rotor so that high G-forces can be obtained. Within the horizontal screen is a screw conveyor which rotates at a speed slightly slower than the horizontal screen to define a controllable conveyor speed. In this way, the residence time of the solids in contact with the horizontal screen can be controlled to provide a drier solids discharge from the apparatus. The solids and liquids are provided with separate discharge ports.

Abstract: A classification system utilizing a cone which is rotated at a specified speed is provided. A stream including a solvent is introduced into the classification, and the stream impacts against the cone and flows along the inside face of the cone. The side of the cone is sufficiently long that the conic face filters the introduced flow, thereby removing substantial portions of the solvent and leaving the heavier or classified parts. The discharge from the cone is thus segregated liquids and solids, and the solid stream is a flow of classified particles and a portion of the solvent. The solvent portion is sufficient in volume to conduct the classified particles as a heavy or thick slurry out of the system. There is an interplay between the length of the cone, i.e. the length along which the introduced slurry must flow, also, the cone angle, and the pores through the cone wall.

Abstract: This disclosure sets forth a method and apparatus for operation of a centrifuge. It is constructed with a fluid inlet at one end delivering a liquid flow into a feed pipe and then into a rotating bowl. The bowl has an outer wall which is cylindrical and which is formed of adjacent individual pieces defining gaps between pieces. In one embodiment, 960 pieces define 960 parallel slots. The slots are quite narrow, having a width of 80 microns to thereby exclude particles larger than that. The mud flow is introduced into the bowl region, and a flited conveyor is operated to scroll the particles along the bowl towards the opposite end, a tapered beach cone, and that terminates at a set of discharge openings. Dry powder too large to pass through the slots is discharged from there. While the slots discharge the mud, particles are removed by this approach.

Abstract: The present conveyor system includes an external bowl with an internal screw conveyor of one or more flites which is rotated to cooperate with the bowl. The bowl and conveyor provides scrolling actions so that a mixed fluid introduced therein is segregated to separate the heavier parts from other parts in the fluid. One aspect of the disclosure is the incorporation of a single motor connected either to the bowl or conveyor, and a output power transmission connected between said bowl and conveyor. The transmission assures that the bowl and conveyor rotated in the right direction to provide the scrolling action which is maintained at as desired ratio with respect to bowl speed. In the preferred form, this includes a dual input, dual output transmission, and a connection so that only one motor source is needed.

Abstract: A skid mounted first and second stage centrifuges, each being provided with an input pump. Drilling mud is delivered to the first pump, the first stage and then into a tank for storing temporarily the liquids separated from the mud. The heavier weight components are segregated, stored and later added back to the liquid discharge of the second stage to provide an output stream of drilling mud having a specified weight for use in drilling. The lighter weight components are removed at the second stage and are discarded to clean the mud. A control system provides for operation and control without overloading.

Abstract: In a horizontal centrifuge, a bowl rotates in the same direction as a screw internally of the bowl. The bowl and screw connect to a three input gear box which rotates the bowl and screw at a small differential, or the scrolling rate. A separate motor running at a variable rate connects to the third gear box input and thereby reduces the scrolling rate. A feedback loop connects to the motor to vary the motor speed so that the scrolling rate is varied. A maindrive motor rotates the bowl which then couples through the gear box to rotate the screw and thereby furnish the power to rotate the bowl and screw.

Abstract: A system for real-time measurement of multiple properties of drilling fluids from a single sampling point may comprise: a pump for transferring fluids in the system, the suction of which may be alternately communicated through suction conduits with a reservoir of drilling fluids being measured and the source of cleaning fluids; valves connected in the suction conduits for alternately allowing or preventing fluid communication between the pump and the drilling fluid reservoir or the source of cleaning fluids; a weight measuring device connected to the discharge side of the pump for receiving and measuring the weight of drilling fluids therefrom; and a viscosity measuring device connected to the discharge of the pump for receiving and measuring indices of viscosity of the drilling fluids therefrom. A source of power is connected to the pump, the weight measuring device, the viscosity measuring device and control apparatus.

Abstract: The present invention provides means for automatically adjusting rollforming equipment to accommodate a range of different gauges of material such as sheet metal being formed. One rollforming roller (34) on each rollforming head (4A) is mounted on an eccentric so that a force supplied in the direction of material feed through the tooling rollers (33,34) will increase the tooling gap therebetween. An automatic gauge adjustor includes applying a source of substantially constant pressure sufficient to achieve the rollforming action against rotation about the eccentric while allowing movement of the rollforming roller also about the eccentric so that the roll will move against the pressure being provided in the direction of the material feed to accommodate the gauge of material within the working range set.

Abstract: The invention provides for a pocketed anchor for post-tensioned concrete reinforcement. The anchor includes a body having a flange portion with a front and rear surface, a button portion extending from the rear surface, and a nose portion extending from the front surface. The anchor also includes a tapered bore that extends through the nose, flange, and button portions. The bore can receive a wedge that cams against the bore to clamp down on a tendon. The front surface of the flange has at least two planar surfaces that are parallel to the bearing surface on the rear surface of the anchor. One of the planar surfaces is recessed relative to the other such that the recessed surface is closer to the load bearing surface on the rear surface of the anchor. The two planar surfaces define a pocket on the anchor, where mounting holes may be located.