Abstract: An assembly for mounting a driven machine and drive includes a support frame on a foundation. The drive is secured to a set of mounting plates which are disposed directly on the support frame. The driven machine is carried by a set of mounting units each of which comprises a pair of spaced carrier elements and a mounting plate arranged between the carrier elements. The carrier elements and the respective mounting plates have cooperating guide means which enable the mounting plates to be adjusted relative to the support frame. In mounting the driven machine and its drive, the two are roughly aligned by shifting the mounting units and/or the mounting plates for the drive on the support frame. Once the driven machine and its drive have been roughly aligned, the mounting units as well as the mounting plates for the drive are anchored in the foundation and welded to the support frame.

Abstract: The inlet and/or outlet edge of a blank which is to be converted into the vane of an impeller for use in a centrifugal pump is reinforced by providing an exposed surface of the blank with a pair of contiguous recesses which extend along the edge and the deeper of which is immediately adjacent to the edge. The recesses are then filled with metallic armoring material by cladding so that some of the surplus extends beyond the recesses and/or beyond the edge. In the next step, the surplus of armoring material is removed by one or more material removing tools, together with a portion of the blank in the region of the edge so that the exposed surface is provided with a fresh edge which is defined by the armoring material.

Abstract: The follow-up guide wheels of a multistage centrifugal pump define flow paths whose cross-sectional area increases exclusively in the axial direction of the respective stages, or axially and radially inwardly, to thus allow for a reduction of the outer diameters of the guide wheels without reducing the efficiency of the pump.

Abstract: The barrel housing of a multistage centrifugal pump has an elongated cylindrical main section and a discrete annular section which is inserted into one end portion and defines an annular shoulder facing the other end portion of the main section. The shoulder is engaged by the inner casing of the pump. The annular section can constitute a prefabricated component or is formed by cladding. The inlet opening of the housing is provided only in the one end portion of the main section, only in a portion of the annular section which extends outwardly beyond the one end portion of the main section, or is a composite opening having a first part in the one end portion of the main section and a registering second part in the annular section. The outlet opening for compressed fluid is provided in the other end portion of the main section.

Abstract: A centrifugal pump has a casing with a cylindrical shell surrounding a volute-type inner section which is formed with a hollow radial extension for admission of fluid into a nipple of the shell. The extension forms part of or constitutes a separable sealing device between a passage of the inner section and a passage of the shell. The inner section is suspended in the shell by one or more pipes which are coaxial with the rotor and/or by one or more projections which extend radially from the inner section and abut against the internal surface of the shell or extend into recesses provided therefor in the internal surface of the shell.

Abstract: A turbine driven pump wherein a multi-stage centrifugal pump unit is coaxial with and mounted on a common shaft with a turbine unit. The two units are connected to each other by a low-pressure section which defines a hydrostatic seal between the interior of the pump unit and the interior of the turbine unit. The inlet and outlet of the turbine unit are connected with each other by a conduit containing a regulating valve, and the inlet of the pump unit is connected with chambers at the outer sides of relief pistons disposed at the high-pressure sides of the two units. The diameters of the relief pistons are proportional to pressures in the high-pressure portions of the respective units. The inlet of the pump unit is coaxial with the outlet of the turbine unit.

Abstract: The passage in a wall which separates the interior of the housing of a glandless submersible motor pump from the surrounding atmosphere is normally sealed by an annular seat which is placed against the end face of a muff forming a detachable part of the wall, and by a temperature- and pressure-resistant ceramic sleeve which surrounds an elongated metallic conductor and normally bears against the seat owing to the pressure differential between the interior of the housing and the surrounding atmosphere. If the sleeve is destroyed, a normally confined plunger of the conductor bears directly against the seat to prevent escape of fluid from the pump housing. That end portion of the conductor which extends into the housing is surrounded by one or more layers of insulating tape and by a tubular sheath which is shrunk onto the tape and exhibits at least some thermal-shock-absorbing characteristics.

Abstract: A centrifugal pump impeller, particularly for use in pumps for effecting forced circulation of contaminated fluids in the primary circuits of nuclear reactor plants, has an impeller body which is surrounded by a cylindrical wear ring. The wear ring has an exposed end face and a second end face which is adjacent to a circumferential shoulder of the impeller body. The second end face of the ring is formed with axially parallel bores or slots which extend toward but short of the first end face, and the shoulder has recesses which are aligned with the open ends of the adjacent bores or slots. The first end face of the ring is formed with markers in the form of notches which register with the corresponding bores or slots and allow for accurate positioning of a boring tool which is used to bore out the ring after a certain period of wear to facilitate its separation from the impeller body and replacement with a fresh wear ring.

Abstract: The casing of a centrifugal pump which is subjected to pronounced external stresses is secured to a foundation or to a base plate by one or more rings which surround the casing and receive stresses therefrom. Each ring has lugs which transmit the stresses to the support; one surface of each such lug can be located in a plane which includes the axis of the pump casing and each of these surfaces abuts a complementary surface of the support. If the casing is surrounded by two rings, each ring is located at a different axial end of the casing. One of the rings can be shrunk onto the casing, and the other ring then allows the casing to move angularly and/or axially therein or therewith but relative to the foundation or base plate so as to compensate for dimensional changes in response to temperature changes. Instead of being shrunk onto the casing, the one ring can be secured thereto by one or more keys, wedges and/or pins.

Abstract: A slurry feed pump which delivers a highly pressurized suspension of coal particles, coal oil and a catalyst to a liquefaction reactor is installed in a plenum chamber which is filled with pressurized coal oil and surrounds the pump housing. The suspension-supplying conduit sealingly extends into the chamber and is connected with the inlet of the pump housing, and a second conduit which delivers pressurized suspension to the reactor sealingly extends into the plenum chamber and is connected with the outlet of the pump housing. The pump is a vertical cantilevered centrifugal pump which is operated below first critical speed and its housing has holes for admission of coal oil from the plenum chamber to those parts in the pump housing which are most likely to undergo extensive wear under the action of coal particles in the suspension.

Abstract: A submersible motor pump assembly has a motor which is installed at a level below the pump. The shaft which is driven by the motor and rotates the impeller or impellers of the pump is spacedly surrounded by a tubular member of a thermal barrier in the region between the upper end of the motor housing and the lower end of the pump casing. The solid impurities, especially magnetizable particles, which are circulated by the pump tend to penetrate into the motor housing by way of the clearance between the tubular member and the shaft, and the penetration of such impurities into the motor housing is prevented by an apparatus which conveys a stream of liquid from the discharge nozzle of the pump casing into the clearance and contains a filter with several electromagnets which intercept magnetizable particles and allow a clean stream of flushing liquid to flow into the clearance.

Abstract: A motor-pump aggregate whose pump is a glandless centrifugal pump and is intended for use in a nuclear reactor plant has hollow coaxial pump and motor shafts which are sealingly coupled to each other. To this end, the first end portion of the pump shaft extends into the adjacent first end portion of the motor shaft and has an external conical shoulder for engagement with an internal conical seat of the first end portion of the motor shaft. A feather holds the first end portions against rotation relative to one another, and the shoulder is urged against the seat by a pair of threaded connectors one of which is anchored in a disc-shaped member in the region of the second end portion of the motor shaft and the other of which is anchored in the first end portion of the pump shaft. The disc-shaped member and the second end portion of the motor shaft have mating ring gears to ensure accurate and a reproducible centering.

Abstract: A centrifugal pump comprises a casing which has two volutes disposed substantially diametrically opposite each other in such a way that the end of the first volute is adjacent to the start of the second volute. The outer diameter of the casing approximates or equals the diameter of the first volute in the region of the end of the first volute. This contributes to compactness of the casing. The volutes surround a rotary impeller or a guide wheel which is installed in the casing downstream of the impeller. Each volute extends along an arc of at most 180 degrees. The casing can have one or more elongated channels extending from the end of the first volute, along the second volute, and to a common outlet nozzle for both volutes.

Abstract: An apparatus which removes contaminants from the liquid in a centrifugal pump has a housing connected with the pump shaft and having a cleaning chamber connected with a first space containing contaminated liquid and a second chamber connected with a second space for cleaned liquid as well as with the first chamber. The second space communicates with the first space by way of a narrow clearance which further communicates with an outlet of the first chamber. The first chamber can contain a disc separator and its outlet is positioned in such a way that, when the housing rotates, liquid entering the first chamber from the first space is relieved of impurities and flows into the second chamber where it can undergo additional cleaning prior to entering the second space. The contaminants return into the first space via outlet and the clearance, and those contaminants which are contained in the liquid entering the second space are returned into the first space by way of the aforementioned clearance.

Abstract: The double volute casing of a centrifugal pump has a main portion which has first and second volutes extending along arcs of not more than 180 degrees. The outer diameter of the main portion equals or approximates the outer diameter of the end of the first volute, and such end is adjacent to the start of the second volute whose end communicates with an outlet nozzle of the main portion. The latter has two channels which flank the second volute and extend between the end of the first volute and the outlet nozzle. The inner sides of the channels are open and face the axial passage of the main portion. Such inner sides are sealed from the axial passage by tubular inserts which are installed in and are separably fastened to the main portion of the casing. The passage receives a single-suction or a double-suction impeller or a stationary guide wheel which is located downstream of the impeller. The main portion of the casing is a one-piece casting.

Abstract: The housing of a distributor valve has a first inlet for admission of a liquid which is maintained at a first pressure, a second inlet for admission of a liquid which is maintained at a higher second pressure, and at least two outlets. The cylindrical valving element has a first passage, one end of which is in permanent communication with the first inlet and the other end of which can be moved into register with a selected outlet in response to rotation of the valving element. The latter has a second passage, one end of which is in permanent communication with the second inlet and the other end of which registers with an outlet other than that which is in register with the other end of the first passage. The second passage and/or the second inlet admits highly pressurized flusing liquid into the clearances between the housing and the valving element to prevent penetration of liquid which is admitted via first inlet.

Abstract: An arrangement for directly transporting manganese nodules obtained in ocean bottom mining, entrained in carrier water, to a ship includes a riser conduit and a submersible motor-pump arrangement located at the ocean bottom and discharging into the riser conduit in continuous operation. The motor-pump arrangement is so designed and operated that the highest possible pressure reduction therein due to changing consistency of the respective flowable medium minus the pressure differential along the characteristic curve of the pump arrangement at most equals, for all operating points along a characteristic control line, the pressure differential between a continuous operating point and the lowest pressure of the corresponding characteristic curve of the riser conduit at the operating limit.

Abstract: A seal for closing a gap which is present between a tubular housing member and a plate-shaped closing member pivotally mounted within the housing member in the closing position of the closing member includes two resilient sealing lips which, even when unstressed, assume substantially symmetrical curved configurations; when the closing member assumes its closing position, the sealing lips, which have an effective width exceeding that of the gap and which are detachably mounted on the housing member, are stressed and press against the closing member to seal the gap against penetration of media therethrough in either direction. The sealing lips surround the closure in an annular manner and are made of a metallic material.

Abstract: A spool-shaped metallic heat barrier is inserted between the motor housing and the pump housing of a motor-pump assembly which conveys fluids at elevated temperatures. The flanges of the heat barrier abut against and are connected to the respective housings by means of bolts, and are rigidly secured to each other by several annuli of discrete heat dissipating ribs which are adjacent to the peripheries of the flanges. That flange which is adjacent to the motor housing can be formed with a peripheral groove the radially outermost portion of which receives a ring-shaped closure so that the inner portion of the groove forms an annular channel for reception of a stagnant or circulating liquid coolant.

Abstract: That part of the sheath of an electric cable which extends through a hole in the housing of a submersible pump motor is surrounded by a metallic sleeve having end portions of reduced diameter. Such end portions and the adjacent portions of the sheath are surrounded by and bonded to tubular insulators whose maximum outer diameter does not exceed the maximum outer diameter of the sleeve. The insulators may consist of convoluted strip-shaped material or foil which is bonded to the adjacent portions of the sleeve and sheath. The clearance between the median portion of the sleeve and the surface surrounding the hole is sealed by one or more O-rings or by a bolt which is threadedly connected to the housing and surrounds the sleeve, a nut which surrounds the sleeve and meshes with the bolt, and a deformable ring seal which is interposed between the sleeve on the one hand and the bolt and nut on the other hand to be deformed by the nut when the latter is rotated in a direction to receive a larger portion of the bolt.