Abstract: A system for transporting corrosive or erosive fluids having a flow conduit or flow equipment with a flow bore. One or more inserts (50) are disposed within the flow bore of the flow conduit or flow equipment. The insert(s) (50) include an internal structure (52) and an erosion or corrosion resistant coating (54) disposed around the internal structure. The insert(s) (50) is/are disposed inside the flow bore and provide erosion and/or corrosion resistance.

Abstract: A material guiding device is provided, including: a main body, including a first portion and a second portion which are coupled with each other, the first portion and the second portion defining a channel, the channel including an inlet portion and an outlet portion which commuted are with each other and a concave portion which is commuted between the inlet portion and the outlet portion, the inlet portion and the outlet portion extending respectively in a first extending direction and a second extending direction; in the first extending direction the concave portion being outwardly protrusive beyond the outlet portion, the concave portion being connected with the outlet portion and including a projection extending toward the first extending direction.

Abstract: A bracket holds a rigid or flexible tube during the pouring of a concrete slab. The bracket has a base and a housing connected to the base. The tube curves around a first tube support on the housing before passing through an opening in the bottom of the housing. The tube and any members inside the tube are cut off so they end inside the housing and are then covered by a housing cap. The base is fastened to a form for the concrete slab. The height of the housing relative to the base is adjusted to place the cap at the planned surface of the concrete slab. After the concrete slab is formed the cap is removed and the cut members inside the housing are connected to other members or devices.

Abstract: A method and apparatus for producing a curved tubular segment includes obtaining a curved external tubular element and a curved internal tubular element. The curved internal tubular element is made of a material having a resistance to wear greater than that of the curved external tubular element and has a cross section such as to cover at least part of the internal surface of the curved external tubular element. The curved internal tubular element is inserted inside the curved external tubular element after heating the latter by a heating unit. To form the curved external tubular element on the exact geometry of the curved internal tubular element, a molding unit and a cooling unit are used to obtain a curved tubular segment without spaces between the curved external tubular element and the curved internal tubular element.

Abstract: The present disclosure provides a pipe coupling that includes a coupling body, a first pack joint nut, and first and second sleeves. The coupling body is made of a first metal material and the first pack joint nut is made of a second metal material. The first pack joint nut is configured to receive a portion of a first pipe. The pipe is made of a dissimilar metal material to the first and second metal materials of the coupling body and the first pack joint nut, respectively. The first sleeve is configured to line at least a portion of an inner periphery of the coupling body. The second sleeve is configured to line at least a portion of an inner periphery of the first pack joint nut. The first and second sleeves are made of non-metallic materials, and serve as physical non-metallic barriers between the first/second metal materials of the coupling/first pack joint nut, and the dissimilar metal material of the first pipe.

Abstract: The present invention relates to a pipe connector and a pipe-connected embedded box including the same. The pipe connector comprises a connector body and an insert object.

Abstract: A method of improving the life expectancy of piping has steps of determining a circumferential position in the piping having a highest expected rate of wall thickness reduction; determining a circumferential section of a pipe length having a greatest wall thickness; and installing the pipe length in the piping by rotating the pipe length to align the circumferential section of the pipe length having the greatest wall thickness with the circumferential position of the piping having the highest expected rate of wall thickness reduction.

Abstract: A quick-change wear sleeve for a high pressure fluid conduit is retained in a fluid passage of the fluid conduit by a resilient retainer ring received in complementary grooves in an outer surface of the quick-change wear sleeve and an inner surface of the fluid passage.

Abstract: A exhaust manifold flange bolt repair system uses a spring loaded bolt to provide a quick and easy exhaust repair. The system of the present invention seals the gap in the exhaust and, when properly installed, will not come off. The repair system includes an oval clamp that can be applied to the exhaust manifold after a broken manifold bolt is removed. The oval clamp includes a female threaded portion that can be disposed over the hole of the exhaust manifold where the broken bolt was removed. A bolt can be threaded into the female threaded portion of the oval clamp, and a portion of the end of the bolt can fit into the hole in the exhaust manifold. This bolt provides a replacement manifold bolt. Springs can be disposed between a nut and the exhaust pipe flange, along the new bolt and any remaining manifold bolts.

Abstract: An elbow has an elongated inlet, an elongated outlet tube that merges with the inlet at a shallow angle, and an endwall opposite the inlet. The round inlet receives product and leads to a first chamber with a rounded bottom. Opposite the bottom, the inlet has a pitch at the transition to the outlet tube. The outlet tube continues upwardly from the pitch to an exit. Within the outlet, a third chamber extends from the first chamber. The first chamber and the third chamber intersect at the second chamber that provides a transition to the flow of product from the first chamber to the angle of the third chamber. Within the second chamber, conveyed product forms a shallow eddy so that additional product flows over the eddy enroute to the outlet.

Abstract: A delivery pipe (1) for the transport of solids is described. The delivery pipe (1) has a double-layer pipe body (2) which has a coupling collar (7, 8) on the inlet-side pipe end (5) and on the outlet-side pipe end (6). A first wear ring (9) and a second wear ring (10) are provided in succession in the longitudinal direction of the pipe body (2) in the region of the inlet-side coupling collar (7). The second inner wear ring (10) has a length (L) which is sized greater than or equal to half the internal diameter (ID) of the pipe body (2). As a result, wear phenomena can be reduced in the inlet-side region of the delivery pipe (1) and the service life of the delivery pipe (1) can be increased considerably.

Abstract: An elbow fitting for a pneumatic product conveying system expands from the inlet pipe along the outer side of the elbow fitting to enable a layer of accumulated product particles to be formed so as to move at a lower velocity than the velocity of the incoming product stream while establishing a moving contact surface for deflecting incoming product particles toward the outlet pipe with a minimum of pressure resistance and product attrition. The outer portion of the elbow fitting is removable from the body portion to allow the outer portion to be replaced when wear becomes an issue in the performance of the elbow fitting. The wear member is affixed to the body portion by a flange that creates a seam extending from the step feature diagonally to the rear wall. A gasket or O-ring is trapped within the flange to seal the wear member against the body portion.

Abstract: A method of replacing pipe couplings is provided. The couplings, such as elbow joints, “T” couplings, “Y” couplings, etc., have a traditional conduit construction including tubular end sections which telescopically connect to pipe ends. The couplings are removed by cutting the pipes adjacent to the couplings tubular sections so that the pipes have a reduced length. A replacement coupling is connected to the pipe ends. The replacement coupling has tubular sections which are extended to have an increased length “L”. The increased length allows the replacement coupling to mate to the respective pipes even though the pipes have a shortened length than prior to removal of the replaced coupling.

Abstract: A pipe fitting assembly package and fastening ring removal tool allow re-use and repair of push-fit piping fittings and valves without damage to the fitting or valve elements or the pipe. The quick connection pipe fitting assembly package of the present invention employs a threaded retaining cap that when removed, exposes the clamping, sealing and fastening mechanism of the fitting or valve. In one embodiment, the present invention further includes a removable packing gland mounted on a body about an axis of an orifice. The fastening ring removal device provided as part of the present invention is manually pushed onto the cylindrical object and is capable of expanding to traverse over the installed fastening ring. The fastening ring removal device includes a parallel angular surface to lift the fastening ring off of the pipe member.

Abstract: A pipe fitting assembly package and fastening ring removal tool allow re-use and repair of push-fit piping fittings and valves without damage to the fitting or valve elements or the pipe. The quick connection pipe fitting assembly package of the present invention employs a threaded retaining cap that when removed, exposes the clamping, sealing and fastening mechanism of the fitting or valve. In one embodiment, the present invention further includes a removable packing gland mounted on a body about an axis of an orifice. The fastening ring removal device provided as part of the present invention is manually pushed onto the cylindrical object and is capable of expanding to traverse over the installed fastening ring. The fastening ring removal device includes a parallel angular surface to lift the fastening ring off of the pipe member.

Abstract: The present invention generally relates to a wrap member that is used with compression connectors, such as compression couplings and fittings that may be connected to one size of duct (such as pipe or tubing) or multiple sizes and shapes of ducts. The wrap member may be connected to the duct so that the wrap member abuts against a portion of the connector, holding the connector and the duct in place against any thrust loads that tend to push the duct out from the connector. The wrap member may also be positioned between the duct and a compression member (such as a ferrule) that comprises the compression connector, so that a fluid-tight seal is formed between the duct, the compression member, and the wrap member. This allows the compression connector to be connected to ducts that are smaller than the size of duct for which the connector is designed.

Abstract: The invention discloses a spliced abrasion resistant ceramic elbow, wherein an abrasion resistant ceramic inner lining (4) is disposed on the inner surface of a seamless elbow body (1), and is formed by splicing a plurality of abrasion resistant ceramic tiles (2). The abrasion resistant ceramic tiles (2) are spliced along the circumferential direction to form an abrasion resistant ceramic ring (5) fitted with said seamless elbow body (1). A plurality of abrasion resistant ceramic rings (5) is connected along the axial direction to form an abrasion resistant ceramic inner lining (4) fitted with the seamless elbow body (1). The abrasion resistant ceramic elbow of the invention provides the advantages of good abrasion resistant capability, low brittleness and no shrinkage strain, simple structure, easy manufacture and assemble, low cost, and good reliability.

Abstract: A pipe reinforcement system for reinforcing a pipe including a pipe section having an inner and an outer elbow surface separated by a pipe opening with a plurality of ceramic tiles overlying the pipe section, each of said tiles having a generally arcuate inner surface, said plurality of tiles secured to said pipe section with said inner arcuate surface positioned adjacent to said outer elbow surface.

Abstract: Liners useful as piping elbow liners comprising a body liner, a tangential inlet liner, and a tangential outlet liner. The tangential inlet liner and the tangential outlet liner can be removably inserted into a cavity in the body liner. The body liner can comprise two substantially-identical body section liners.

Abstract: A method and device for repair and replacement of pipe broken at a junction. The device includes a coupler having a female end and a male end. The female end of the coupler has an inside diameter that will accept snugly the removed end of the broken pipe. The male end has an outside diameter that will snuggly fit into a new junction. The method and device is normally used with PVC pipe. When PVC pipe entering a junction is broken near the junction, the junction may be removed by cutting back from the broken PVC pipe and cutting the remaining pipe where it enters the junction. A new junction can be replaced with the coupler inlapping the new junction and overlapping the pipe.

Abstract: There is an object to provide a technique of forming a proper abrasion resistance layer by a thermal spraying and fusing of a self fluxing alloy. The object may be solved by cutting the pipe body along a curved face that is perpendicular to a plane including a central axis of the pipe body and that extends not to cross the inlet hole and the outlet hole but to include a part of the central axis. Thus the pipe body is divided into a first partitioned part having at least one of the inlet hole and the outlet hole, and a second partitioned part. An abrasion resistance layer is then formed on the inner surface of at least the outer bent portion of the pipe body by a thermal spraying and fusing of a self fluxing alloy. Thereafter, the first partitioned part is fitted into the second partitioned part for welding to obtain a bent pipe according to the present invention.

Abstract: A system and method for making a repair to a damaged section of a conduit includes a pair of couplers, which securely mate, with undamaged sections of the conduit, which straddle the damaged section of the conduit; and a bridging duct, which replaces the damaged section. In one embodiment, the couplers are placed around the undamaged section of the conduit and the bridging duct is placed around the couplers.

Abstract: An erosion resistant pipe flange assembly for preventing erosion of metal pipe flanges connecting two joints of pipe. The erosion resistant pipe flange assembly includes a flange section, a reducer section integrally formed with said flange section, and a replaceable liner for preventing erosion and abrasion of the interior of said pipe flange assembly.

Abstract: An erosion resistant pipe flange assembly for preventing erosion of metal pipe flanges connecting two joints of pipe. The erosion resistant pipe flange assembly includes a flange section, a reducer section integrally formed with said flange section, and a replaceable liner for preventing erosion and abrasion of the interior of said pipe flange assembly.

Abstract: A pipe section for concrete includes an end coupler interconnecting to another pipe section in a flow line. The coupler has an outer clamp secured extended from the pipe end with a coupling groove. An encircling clamp has sides located in the grooves of adjacent pipe sections to lock the pipe section together. The body and pipe end form an inner recess extending from the pipe end. An insert liner has a tubular portion matching the recess, with the outer surface of the tubular portion tapered to form a gap within the recess. The insert liner has an outer flange matching the outer diameter of the body and abuts the body. The inner wall of the liner has a central transition point from which the wall tapers inwardly in opposite directions to the outer end. The body member is formed of a high strength ductile steel. The insert liner is formed of a wear resistant material having a Rockwell hardness of 80 to 90.

Abstract: A conveying pipe for hydraulically transporting solids, such as sand, gravel or also concrete is composed of a straight or curved pipe portion and of coupling flanges at the ends of the pipe portion, wherein the coupling flanges protrude radially above the outer surface of the pipe portion. The outer end faces of the coupling flanges which face away from each other are each located in the transverse planes of the end faces of the conveying pipe. The coupling flange located at the end of the conveying pipe on the inlet side has a greater width than the coupling flange arranged at the end on the outlet side.

Abstract: An erosion resistant pipe flange assembly and a method for preventing erosion of metal pipe flanges connecting larger diameter pipe to smaller diameter pipe. The erosion resistant pipe flange assembly includes a flange section, a reducer section integrally formed with said flange section, and a replaceable liner for preventing erosion and abrasion of the interior of said pipe flange assembly.

Abstract: A connection of a coupling collar to the ends of hardened conveying pipes for fluidically conveying solids, such as, sands, gravels and concrete, includes a coupling collar with a connecting piece which is glued in a tension-proof manner to the outer surface of the end of a pipe and at least one wear ring is placed at least in the length portion of a connecting flange of the coupling collar at the end face of the pipe end.

Abstract: A connection of steel pipes for conveying solid materials, particularly for conveying gravel, includes radially directed coupling flanges which extend circumferentially at the ends of the steel pipes. The coupling flanges have receiving bores for the coupling bolts, wherein the receiving bores extend parallel to the longitudinal axes of the steel pipes and are arranged on a pitch circle. At least one wear ring is inserted between the end faces of the steel pipes which face each other. The wear ring is of a material which has a greater resistance to wear than the material of the steel pipes.

Abstract: A pipe swivel joint comprises a female conduit element and a male conduit element rotatably engaging the female conduit element. A removable plug within the female conduit element maintains a main seal in proper position for bridging a clearance between the female and male conduit elements. The plug is easily removed once the main seal is to be replaced, and is installed back in place once the main seal has been replaced, thereby avoiding dismantling of the swivel joint.

Abstract: A fluid-tight modular joint is disclosed having various replaceable parts for refurbishing the joint after certain parts wear out. Specifically, the modular joint has a pair of sealing assemblies interconnected by a tubular sealing member which permits angular misalignment, axial movement and rotational movement between conduits. Each of the sealing assemblies includes a tubular housing with a replaceable sealing sleeve which is positively retained therein by a split retaining ring. Typically, the housings are welded to conduits, and thus, can only be removed by cutting them from their respective conduits. However, the housings are provided with access openings for inserting a camming tool therein to remove the sealing sleeves without cutting the housings away from their respective conduits. Therefore, in refurbishing the modular joint, the housings are reusable, while the sealing sleeves and tubular sealing members are replaceable.

Abstract: Provided is a co-axial hydraulic hose assembly having a co-axial hose coupling releasably joining an inner hose and an outer hose of the assembly in a fluidly sealed engagement. The coupling construction comprises an end seal nut that securely fixes each end of the inner hose to each respective end of the outer hose, but which may be removed so that the inner hose may be removed if it has ruptured. Thus, a ruptured inner hose may be removed and replaced with a new inner hose inside of the original outer hose, and then the end seal nut is replaced at each end of the hose assembly to secure the two hoses releasably together in a fluidly sealed engagement, thereby allowing for continued use of the repaired co-axial hose.

Abstract: A flow valve for mating with a fluid coupling of the type comprising a cylindrical body and a plurality of circumferentially spaced latches. The flow valve comprises a generally cylindrical valve housing and an annular flange adjacent one end of the valve housing. The flange is mounted to the valve housing such that the flange is rotatable to facilitate repositioning of the flange to distribute wear on the flange caused by the circumferentially spaced latches of the fluid coupling. In a preferred embodiment, the flange is symmetric and the flange and the valve housing each comprise a predetermined pattern of holes for receiving fasteners for mounting the flange to the valve housing. After a period of use, the fasteners can be removed and the flange repositioned, or reversed, to distribute wear to other locations on the flange.

Abstract: A double-layer pipe bend for a pipeline includes an inner pipe of cast steel, an outer pipe of weldable steel surrounding the inner pipe, and connecting flanges at the ends of the pipe bend. The connecting flanges are welded to the outer pipe. The inner pipe and the outer pipe are formed such that a pressure-compensating layer can be formed by the transported medium between the pipes. Another pressure-compensating layer can form between an inner wearing ring and an outer coupling ring of each connecting flange. The wearing ring and, thus, the inner pipe, is axially secured by a groove in the wearing ring and a radial collar in the coupling ring.

Abstract: A dust seal connector for accommodating the relative movement between the enclosed, moving screen box of a screening machine, and a fixed particle inlet or outlet conduit connected to the screen box. The relative movement occurs as sliding motion between a suspended flat slide plate and a wear ring below the slide plate, with which the plate is facially engaged. The plate is connected upwardly by an enclosed particle passage to the conduit or box member from which it is suspended, and communicates downwardly with an opening in the ring for the flow of particles. In a preferred embodiment the particles flow through an axially compressed corrugated sleeve which connects the plate to the member from which it is suspended, compression of the sleeve biasing the ring and plate together to maintain a sliding dust seal between them.

Abstract: An anti-kinking device used in conjunction with a garden variety water hose, wherein the device includes a housing defined by a tubular body having a coupling member rotatably mounted to the tubular body so as to be connected to a water faucet, wherein the opposite end of the tubular body is threaded so as to connect to a garden-type hose, and further includes an elongated flexible nylon cable that is fixedly secured to a boss member formed in the internal wall of the tubular body, whereby the cable is formed with a length so as to be readily positioned within the full length of the hose.

Abstract: The assembly comprises a pair of semi-circular steel shells. The inner surface of one shell forms a centrally located, circular recess and a concentric groove positioned between the recess and the side edges of the shell. A flat cylindrical annular seal element is seated in and fills the recess. The element is resilient and deformable. It has concentric protruding ribs on its top and bottom surfaces. The seal element is adapted to circumscribe a leaking small hole or crack in the wall of an internally pressurized pipeline. The shells are then circumferentially clamped against the pipeline to cause the element to seal around the leak and to effect tight shell-on-pipe contact. The steel side wall of the recess confines the compressed seal element. The side edges of the shell are then welded together longitudinally and circumferentially to create a permanent pressure vessel sealing and containing the leak.

Abstract: A conduit elbow assembly has a radially split outer housing and a replaceable liner. The liner fits loosely within the housing so that material flowing in the elbow accumulates in the void formed in the housing. The hardened liner is thus reinforced, rendering both inner and outer liner hardened surfaces usable in resisting abrasive attack prior to liner failure. A removable housing member exposes the liner for cutting during replacement. Holes in the outer housing permit leakage of fluent material upon liner failure, thus indicating the need for repair prior to conduit rupture. The assembly is adaptable to accommodate varying pipe dimensions within a particular nominal pipe size.

Abstract: An access housing is provided between segments of an outer containment pipe of a double containment pipe assembly through which the flanged ends of a primary pipe may be accessed with the ability to readily assemble and disassemble the inner piping system in modular sections.

Abstract: A rotating head having a bowl assembly and a rotating assembly disposed in a bowl opening formed in the bowl assembly. The rotating assembly comprises and elastomeric member and a rotating bushing. The rotating bushing is connected to an outer peripheral surface of the elastomeric member. The rotating bushing bearingly contacts a portion of the bowl assembly during the operation of the rotating head wherein the elastomeric member and the rotating bushing are rotated and the elastomeric member sealingly engages a portion of the bowl assembly for forming a seal between the rotating assembly and the bowl assembly. The rotating assembly is removable from the bowl assembly and can be replaced with another rotating assembly thereby simultaneously replacing the elastomeric member and the rotating bushing.

Abstract: The assembly comprises a pair of semi-circular steel shells. The inner surface of one shell forms a circular recess. A flat cylindrical annular seal element is seated in and fills the recess. The element is resilient and deformable. It has concentric protruding ribs on its top and bottom surfaces. The seal element is positioned to circumscribe a leaking small hole or crack in the wall of an internally pressurized pipeline. The shells are then circumferentially clamped against the pipeline to cause the element to seal around the leak and to effect tight shell-on-pipe contact. The steel side wall of the recess confines the compressed seal element. The side edges of the shells are then welded together longitudinally and circumferentially to create a permanent pressure vessel sealing and containing the leak.

Abstract: Apparatus for connecting a conduit to an equipment opening having damaged female threads includes a body, an annular packing ring and a packing follower. The packing ring is formed of an extrudable, non-resilient packing material. The body and the packing follower are threaded to engage the female threads of the equipment opening. The packing ring is compressed and extruded into the damaged threads by relative rotation of the body and packing follower.

Abstract: A pipe for conveying solid matter, particularly for conveying concrete. The pipe has a cylindrical middle portion and a double-layer welding neck with annular coupling flange at each end of the middle portion. The inner layer is replaceably clamped in the outer layer in a positively locking and frictionally engaging manner. This is accomplished by a roof-like bevel of the inner layer which is engaged by a corresponding inner groove of the outer layer which is of limited elasticity. The inner diameter of the inner layer may be smaller than the inner diameter of the cylindrical middle portion.

Abstract: A structure to replace the outer wall of a pipe elbow to provide wear resistance in pneumatic conveying pipes carrying particulate material, said structure having a chamber with a source of vacuum suction therein disposed on the outer portion of the elbow with a screen disposed in the chamber where particles passing through the pipe are drawn and held by the suction against the screen member to form a particle accumulation area which is struck and worn by the oncoming stream of particles. Worn areas of the particle accumulation are replaced by new particles passing through the pipe.

Abstract: Each end fitting of the union has an end for fixing the fluid line, and a coaxial metallic body terminating in an annular radial polished section where the internal bore of the union issues. A washer made of a deformable synthetic material is pressed on this metallic body and has a flat annular radial face which, together with the polished section, forms the free face for connecting the end fitting. A cylindrical metallic ring accommodates internally with a contact fit the two washers and a portion of the two metallic bodies, so that the two free connecting faces come to be opposite each other. Two clamping half-shells grip the two end fittings to ensure the connection of the fluid lines.

Abstract: A liquid flow tube extends through an anti-friction bearing so that the tube can rotate around its axis while liquid is flowing through the tube interior space. A dynamic seal is arranged between the outer cylindrical surface of the tube and a stationary sleeve structure. Preferred sealing material is rope-like packing helically wound within an annular recess in the sleeve structure; an annular piston extends into the recess to apply force onto the packing for preventing any leakage across the packing interfaces (at the sleeve or tube surfaces).

Abstract: A pipe elbow for transmission of abrasive materials therethrough defining a square or rectangular cross-sectional shaped flow passageway in the area wherein the direction of flow of said abrasive material is changed, said pipe elbow including an outer casing comprised of planar or curved planar surfaces having an outer and an inner surface, said pipe elbow further including a plurality of tiles lining the entire inner surface of said outer casing so that the inner surfaces of the tiles define a flow path defined by at least four sides of a box shaped bend section comprising a deflection wall receiving the greatest abrasive force, two side walls parallel to each other and perpendicular to the deflection surface, and a fourth wall perpendicular to the side walls and facing the deflection wall, said inner tiles having a substantially greater wear resistance to abrasive material flowing therethrough than said outer casing.

Abstract: The connector pipe segment for conductor pipes or conduits for gaseous as well as fluid flow media comprises a pressure-tight outer shell, at least two connector pieces, a plurality of sealing surfaces and a wear-resistant sleeve, advantageously of a sintered ceramic material. The wear-resistant sleeve is inserted in the outer shell and the sealing surfaces are located on the outer shell. The wear-resistant sleeve is inserted with radial play and with axial play free of force in the outer shell so that a gap is formed between the outer shell and the wear-resistant sleeve. The gap is connected with the open cross section of the wear-resistant sleeve and admits the flow media.

Abstract: A gland seal for addition to a boiler and furnace structure which has pipes (20) passing through a waterwall (12) and seal box (30). The gland seal includes a packing (40) of ceramic rope of square cross-section wrapped on the pipes (20) adjacent the front plate (34) of the seal box (30) with a hose clamp (41) radially constricting the packing and a pressure plate (42) driven by nuts (46) on threaded studs (44) adjacent the pipes (20) axially constricting the packing to eliminate ash leakage through the waterwall joint.

Abstract: A wear resistant elbow or bend for use in the pneumatic transport of abrasive materials which comprises an elastomeric liner (14) and a rigid outer shell (30). The elastomeric inner liner (14) has inlet and exit portions that are circular in cross section and connected to a segment that is a closed "U" shape in cross-section. The top of the "U" is the impingement surface (A) that is on the outside of the bend. The impingement surface (A) is essentially flat and on a plane or planes which are inclined so that the angle of incidence (.alpha.) is at least 35.degree., but not more than 65.degree. with reference to the axis of the inlet portion or the direction of the incoming flow of conveyed material (18).