US3257956A - Centrifugal pump assembly - Google Patents

Description

June 28, 1966 H. LOGUE rm.

CENTRIFUGAL PUMP ASSEMBLY 4 Sheets-Sheet 1 Filed Feb. 6, 1964 INVENTORS. Leland H. Logue Emile P Anderson BY 7 uw g 5W ATTORNEYS June 28, 1966 L. H. LOGUE'. ETAL 3,257,956

GENTRIFUGAL PUMP ASSEMBLY Filed Feb. 6, 1964 4 Sheets-Sheet 2 INVENTORS'. I 60 Leland H. Logue Emile R Anderson BY ATTORNEYS June 28, 1966 L. H. LOGUE ETAL 3,257,956

CENTRIFUGAL PUMP ASSEMBLY Filed Feb. 6, 1964 4 Sheets-Sheet 5 INVENTORS. Leland H. Logue Emile I? Anderson ATTORNEYS June 28, 1966 L. H. LOGUE ETAL 3,257,956

CENTRIFUGAL PUMP ASSEMBLY Filed Feb. 6, 1964 4 Sheets-Sheet 4 i l i 44x l l L l l n 340 f w W///////l\ 5% L e/and .XE L ZS g h I l EmI/e R Anderson FI 11 a 7 %%WM ATTORNEYS 3,257,956 QENTRIFUGAL PUMP ASSEMBLY Leland H. Logue and-Emile P. Anderson, Denver, (2010., assignors to Denver Equipment Company, Denver, Colo., a corporation of Colorado Filed Feb. 6, 1964, Ser. No. 343,049 12 Claims. (Cl. 103-103) This invention relates to centrifugal pumps and to a mounting arrangement for the components of a centrifugal pump operating assembly.

When centrifugal pumps are installed in an operating location, a prime mover such as an electric motor will be mounted in fixed relation to the pump, and the drive usually employs V- belt, or similar transmission, inclusive of a sheave on the shaft supporting an impeller or runner Within the pump casing. Inlet and discharge lines are secured on the pump casing and the entire assembly becomes an essentially permanent or fixed installation.

When such pumps are used as sand pumps or acid pumps they are provided with liner members to prevent excessive wear on or damage to the casing interior, and these liners require periodic inspection and replacement or repair. The impeller also receives considerable wear requiring inspection and occasional replacement. Each time the pump unit requires inspection or repair, all exterior connectionsmust be removed, and the pump casing opened to provide access to its interior. Usually, this involves a considerable amount of time and labor for inspection or before worn parts are removed and replaced,

. and the unit is reassembled.

It is an object of the present invention to provide a base mounting for a centrifugal pump assembly which is normally fixed or stationary but includes a movable portion permitting separation of pump components for quick and easy inspection and replacement.

Another object of our invention is to provide a simple, durable and efficient connector for the discharge line of a pump which normally holds the line in sealed connection with an opening in the pump casing, and which may be actuated by simple manipulation to separate the line from the casing when the latter is to be opened for inspection or repair.

A further object of our invention is to provide a sectional volute casing for a centrifugal pump, which sections are securely joined during operation of the pump, and may be easily separated for inspection or repair of interior components of the pump.

Other'objects reside in novel details of construction and novel combinations and arrangements of parts all of which will be set forth in detail in the course of the following description.

The present invention provides several innovations in the construction and installation of centrifugal pumps, all of which simplify installation and maintenance of the pump and reduce out of service time and labor, particularly in connection with inspection or replacement of interior components of the pump.

One of the innovations provides a base structure adapted for mounting as a permanent plant installation, and including upper platform members on which'the pump and associated operating members are supported. One platform member is arranged for movement toward and away from the other to assist inspection and maintenance of internal components of the pump. In one'application, the motor or other drive components will be mounted on the fixed platform member and the pump casing will'be mounted on the movable member so as to permit separation of a cover portion of the pump casing from the remainder of said casing for exposing its interior and to permit removal of internal components. After reassembly of the internal components, the plat- United States Patent form carrying the casing is moved to close the pump and permit it to resume operation.

Another application has the pump casing secured on the fixed platform and the drive' shaft, shaft bearings, motor and transmission system supported from the movable platform, whereby such components can be moved away from the pump casing to expose its interior. The latter arrangement usually is utilized with smaller size pumps. having a two-piece volute split in a vertical plane and in which the motor is mounted in an overhead position and maintains the transmission drive in fixed relation to the shaft during such movement. For large sized pumps having a one-piece volute and .requiring heavy motors, the first described arrangement is preferred.

Still another embodiment provides a sectional volute casing having a flanged external inlet on one section and a split flanged external outlet with an eccentric actuated connector supported from one split section. The split section containing the inlet and the connector is mounted on the fixed platform member and the other section and drive assembly are supported from the movable platform member.

The inlet and discharge line connectors also utilize novel structural arrangement permitting fast coupling and uncoupling operations. This is of particular advantage because the liners extend from the pump interior with flanged portions seated onthe inlet and outlet flanges and are clamped into liquid sealing relation by the 'connectors. The connectors permit the associated line to be held substantially in its normal operative position while it is separated from the pump casing as in moving the casing in the operations referred to above.

Thus, it will be apparent that in addition to providing a satisfactory base support for the initial pump installation, the base member of this invention greatly assists in pump inspection and servicing, particularly in reducing shut-down time and labor costs thereof.

The practice of our invention will be described with reference to the accompanying drawings illustrating typical embodiments. In the drawings, in the several views of Which'like parts bear similar reference numerals,

FIG. 1 is a side elevation, partially broken to show interior parts, of one embodiment of a centrifugal pump installation utilizing features of our invention;

FIG. 2 is an end elevation of the pump installation shown in FIG. 1;

FIG. 3 is a side elevation similar to FIG. 1 and drawn to a reduced scale illustrating the separation of the platform members of the base and the resulting exposure of the interior of the pump casing shown in FIG. 1;

FIG. 4 is a side elevation of another embodiment of centrifugal pump installation with members separated as in condition for inspection or replacement of parts;

FIG. 5 is a side elevation similar to FIG. 4 but with an opposite arrangement of fixed and movable platform supports;

FIG. 6 is a vertical nector of the present invention which is adapted' for use as the outlet connector with a sectional volute casing assembly;

FIG. 7 is a top plan view of the connector installation 1 shown in FIG. 6;

FIG. 8 is a top plan view of the outlet connector assembly shown in FIG. 1;

FIG. 9 is a section taken along the line 99.of FIGL S,

and drawn to an enlarged scale;

FIG. 10 is a vertical section through the outlet connector assembly of FIG. 8 in the line separating position required for separation of the movable and stationary volute casing portions; and

FIG. 11 is a section similar to FIG. 10 illustrating the liquid sealing action when the pump is operating.

section of one form of line con- The pump installation shown in FIG. 1 is a preferred arrangement for smaller size pumps having sectional volutes and comprises a bed or base portion 12 adapted for attachment or permanent fastening to a floor or other supporting structure 13 as by bolting (not shown). The bed 12 has parallel, upstanding side members 14. Sectional deck or platform members 15a and 15b are supported on the top surfaces of sides 14 and have flanged or guide portions 16 loosely fitted on said sides. The member 15b is mounted for movement toward and away from member 15a, and a screw 17 threaded in a stationary block 18 secured to a transverse portion 120 ofbed 12 and having fixed connections 19 with bearing members secured on platform 15b provides the required movement of platform 15b, preferably by attaching an impact wrench to a headed member 20 on the external end of screw 17.

Platform member 15a has a pedestal 21 bolted on its top surface as shown at 22 which provides fixed support for one section 23a of a Volute casing which fits against another volute section 23b supported from the pump pedestal 24 held on movable section 15b as by bolts 26. Bolts 25 hold the sections 23a and 23b in fluid sealed relation while the pump is operating and are removed when the pump is to be opened for inspection or repair.

Volute section 23a has a central inlet opening 27 (FIG. 2) formed by a flange portion 28 of section 23a mounted on a face plate 29, and a connector member 31 abuts flange portion 28 and is secured thereon by bolts 32. Member 31 carries an inlet line 33 on its exterior surface. Face plate 29 is held on section 23a by bolts 30. Section 23a also has a portion 34a providing an outlet for the pump discharge which has a companion part 34b on section 23b.

Pump pedestal 24 has an adjustable overhead platform 35 supporting a prime mover such as an electric motor 36 having a sheave 37 carrying a plurality of V-belts 38. The pedestal 24 also supports a bearing housing 39 in which a shaft 40 is supported for rotation and a sheave 41 on the shaft is driven by the V-belts 3S. Shaft 40 extends through a gland 42 on section 23b of the casing and supports an impeller (not shown) interiorly of the casing. Section 34b of the outlet portion carried on section 23b cooperates with companion section 34a to form a flanged outlet portion on which a discharge line 43 is secured by a connector member 44, the details of which will be set forth in the following description.

When the pump is to be opened after a period of operation, the bolts 25 and 46a are removed and bolts 46 are loosened. The inlet line is secured on the stationary casing section 23a, and it is unnecessary to detach connector 31 for inspection and line 33 remains in place. However, discharge line 43 must be detached from its seated position to permit withdrawal of casing section 23b from section 23a. A preferred type of connector 44 is shown in FIGS. 8, 9, 10 and 11 which provides a novel detachment arrangement that leaves the discharge line 43 in substantially its normal operating position while the casing sections are separated.

The connector 44 of FIG. 1 comprises a plate member 44a having a flanged opening 45 on which the end of a discharge line, such as 43, is attached. When installed, screws 46 and 46a are inserted through openings 47 in the plate to clamp it onto the projected ends of discharge sections 3411 and 34b. As shown in FIGS. 8, 10 and 11, plate 44a has an arm or outboard portions 44x at opposite sides for the support of two eccentric lifting assemblies.

Each said assembly as shown in FIG. 9 comprises a threaded pivot pin 48 in a bore of outboard portion 44x and extending into threaded engagement with a nut 49 having an eccentric portion 50 mounted in bearings 52 and extending to a square head section 49a. During pump operation, the heads 49a are disposed in a position in which the eccentric portion 50 has allowed plate 44 to be in pressure contact with a flanged liner member 34x, of rubber or the like, and projecting surfaces on the bottom 44z of plate 44a depress the elastic liner material sufiiciently to form an effective pressure seal as shown in FIG. 11 when bolts 44 and 46a have been tightened. When the sections are to be separated, heads 49a are turned to change the eccentric position which lifts bottom 44z to a position in which itclears the top of liner 34x as shown in FIG. 10. The eccentrics 50 are locked in this position by nuts 49.

FIG. 3 illustrates the separated position of pump components and the impeller 53 has been shown detached from its threaded support position at the threaded end of shaft 40 interiorly of easing section 23b to show the arrangement of parts. In such position of the casing members, liners, impeller and other interior parts of the pump are visible, and may be replaced or repaired as required. When the inspection or repair is completed and all parts are in place, the impact wrench is applied to nut 20 to wind the screw in the opposite direction and thereby move section 23b into mating contact with section 23a to permit reassembly of the pump. Referring .to FIG. 4, there is shown an embodiment with the members separated and which is preferably used for larger pumps with one-piece volutes. A bed 60 has upstanding side members which support a movable platform member 61 and a fixed platform member 69 each having flanged guide portions fitting over the upstanding side members of bed 60. Platform member 61 supports a pump pedestal 62 which in turn supports a rotatable shaft 63 and a motor platform 65. Platform member 69 supports a pedestal 64 which in turn supports a pump casing 67. Pump casing 67 has an inlet flange portion with an associated connecting plate bolted thereto, generally indicated by numeral 67a, and an outlet flange portion with an associated connecting plate generally indicated by numeral 67b. These members connect to liquid transport lines (not shown). A replaceable side cover 66 is supported on pedestal 62 near one end of shaft 63 and fits into the pump casing 67 in a sealed relationship during normal operation. An impeller 68 which is shown suspended between the side cover 66 and pump casing 67 fits on the end of shaft 63 by threading or keying during normal operation. When inspection or replacement is required, the platform 61 is moved to the left by suitable mechanical means, such as the screw drive discussed in FIG. 1. This movement opens the interior of the casing 67, permitting removal of impeller 68 as shown and allows complete servicing thereof.

FIG. 5 illustrates an embodiment similar to FIG. 4 which is particularly suitable for large motors which can only be mounted adjacent the pump installation. A bed 70 has upstanding side members which support a fixed platform member 71 and a movable platform member 79 each having flanged guide portions fitting over the upstanding side members of bed 70. Platform member 71 supports a pump pedestal 72 which in turn supports a rotatable shaft 73. Platform member 79 supports a pedestal 74 which in turn supports a pump casing 77. Pump casing 77 has an inlet flange portion with an associated connecting plate bolted thereto generally indicated by numeral 77a and an outlet flange portion with an associated connecting plate generally indicated by numeral 77b. These members connect to liquid transport lines (not shown). A replaceable side cover 76 is supported on pedestal 72 near one end of shaft 73 and fits into the pump casing 77 in a sealed relationship during normal operation.

An impeller 78 which is shown suspended between the side cover 76 and pump casing 77 fits on the end of shaft 73 by threading or keying during normal operation. When inspection or replacement is required, platform 79 is moved to the right by suitable mechanical means, such as the screw drive discussed in FIG. 1. This movement opens ptunp casing 77 as shown in FIG.

5. In this embodiment it is necessary to disconnect the inlet and discharge lines.

. An alternative line connector suitable for use with the outlet line is illustrated in FIGS. 6 and 7.' Pump casing portions 81a and 81b support sectional liner members 82.

The sectional liner members are designated in FIG. 6 by a single numeral 82 because they comprise two identical members which fit together as shown by the divided line in sealed relationship within the pump casings. Line connector 83 is fastened to the pump casings by bolts 84a, 84b, 87a and 87b. Bolt 84a is fastened to connector 83 by a collar 85a and pin 86a. Bolt 84b has a similar collar and pin combination (not shown). Bolts 87a and 87b have no locking collars but are removed allowing the pump casing 81b to slide with the movable platform when this connector is used with the outlet line. Rotation of bolts 84a and 84b separates connector 83 from casing portions 81a and 81b to break the seal therebetween and allow casing portion 81b to move with the movable platform similar to member 23b as shown in FIG. 3.

This connector arrangement is conveniently usable on the discharge line and provides a fast means of breaking the seal between the pump casing and the connector cap so as to elevate the line connector and discharge line. The bolts which remain in the connector cap and pump casing keep the components in line for quick reassembly after servicing.

While particular embodiments have been shown and described, it is distinctly understood that the invention is not limited thereto but that modifications may be made within the scope of the invention, and such variations are covered by the scope of the appended claims.

We claim:

1. A pump assembly comprising a volute casing having an upright flanged outlet portion and a flanged inlet portion distant therefrom adapted for connection with outlet and inlet fluid transport lines, said casing being split into a pair of casing sections, a bed member adapted to be secured on a supporting structure and inclusive of a pair of spaced upright side rails, a platform covering the space between said side rails and having guide portions extending downwardly over the upper portion of said side rails in slip-fitting relationship, said platform being split into a pair of platform sections with one platform section movable over the side rails toward and away from the other platform section in alined relationship, a pedestal member secured on each platform, one said pedestal member disposed in supporting connection with one casing section, the other said pedestal member supporting the other casing section and shaft drive means including a shaft extending into the volute casing, an impeller mounted for rotation on the end of said shaft within the volute casing, and means for moving the movable platform section toward and away from the other platform section to separate the casing between its sections for inspection and repair of the pump.

2. A pump assembly comprising a volute casing having an upright flanged outlet portion and a flanged inlet portion distant therefrom .adapted for connection with outlet and inlet fluid transport lines, said casing being split into a pair of casing sections through the outlet portion, a bed member adapted to be secured on a supporting structure and inclusive of a pair of spaced upright parallel side rails, a platform covering the space between said side rails and having guide portions extending downwardly over the upper portion of said side rails in slipfitting relationship, said platform being split into a pair of platform sections with one platform section movable over the side rails toward and away from the other platform section in alined relationship, a pedestal member secured on each platform, one said pedestal member disposed in supporting connection with one casing section,

the end of said shaft, a block having threads on the interior thereof mounted on the bed member below said platform, and a screw member threaded into said block and attached to the underside of the movable platform section at each end for moving the movable platform section toward and away from the other platform section to separate the casing between its sections for inspection and repair of the pump.

3. A pump assembly comprising a volute casing having an upright flanged outlet portion and a flanged inlet portion adapted for connection with outlet and inlet fluid transport lines, said casing being split into a side cover section and a volute section, a bed member adapted to be secured on a supporting structure and inclusive of a pair of spaced upright side rails, a platform covering the space between said side rails and having guide portions extending downwardly over the upper portion of said side rails in slip-fitting relationship, said platform being split into a pair of platform sections with one platform section movable over the side rails toward and away from the other platform section in alined relationship, a pedestal member secured on each platform, the movable pedestal member disposed in supporting connection with said volute section, the other pedestal member supporting said side cover section and shaft drive means including a shaft extending into the volute casing, an impeller mounted for rotation on the end of said shaft within the volute casing, a block having threads on the interior thereof mounted on the bed below said platform, and a screw member threaded into said block and attached to the underside of the movable platform section at each end for moving the movable platform toward and away from the other platform section to separate the casing between its sections for inspection and'repair of the pump.

4. A pump assembly comprising a volute casing having an upright flanged outlet portion and a flanged inlet portion adapted for connection with outlet and inlet fluid transport lines, said casing being split into a side cover section and a volute section, a bed member adapted to be secured on a supporting structure and inclusive of a pair of spaced upright side rails, a platform covering the space between said side rails and having guide portions extending downwardly over the upper portion of said side rails in slip-fitting relationship, said platform being split into a pair of platform sections with one platform section movable over the side rails toward and away from the other platform section in alined relationship, .a pedestal member secured on each platform, the movable pedestal disposed in supporting relation with said side cover section and shaft drive means including a shaft extending into the volute casing, the other pedestal member disposed in supporting connection with said, volute section, an impeller mounted for rotation on the end of said shaft within the volute casing, a block having threads on the interior thereof mounted on the bed below said platform, and a screw member threaded into said block and attached to the underside of the movable platform section at each end for moving the movable platform toward and away from the other platform section to separate the casing between its sections for inspection and repair of the pump.

5. A pump assembly comprising a volute casing having an upright flanged outlet portion and a flanged inlet portion adapted for connection with outlet and inlet fluid transport lines, said casing being split into a side cover section and a volute section, a bed member adapted to be secured on asupporting structure and inclusive ofna pair of spaced upright side rails, a platform covering the space between said side rails and having guide portions extending downwardly over the upper portion of said side rails in slip-fitting relationship, said platform being split into a pair of platform sections with one platform section movable over the side rails toward and away from the other platform section'in alined relationship, a pedestal member secured on each platform, one said pedestal member disposed in supporting connection with said volute section, the other pedestal member supporting said side cover section and shaft drive means including a shaft extending into the volute casing, an impeller mounted for rotation on the end of said shaft within the volute casing, a flexible liner supported in the casing extending through the outlet portion and overlapping the flange of the outlet portion, a plate member having a sealed connection with the outlet line, a connector assembly arranged to clamp the overlapping portion of the liner sections between the outlet flange and the plate member in one position and to separate the plate member from the flange and liner section in the other position, a block having threads on the interior thereof on the bed member below said platform, and a screw member threaded into said block and attached to the underside of the movable platform section at each end for moving the movable platform section toward and away from the other platform section to separate the casing between its sections for inspection and repair of the pump.

6. A pump assembly comprising a volute casing having an upright flanged outlet portion and a flanged inlet portion distant therefrom adapted for connection with outlet and inlet fluid transport lines, said casing being split into a pair of casing sections through the outlet portion, one section supported on a stationary base member and the other section supported on a movable base member, a plate attached to said outlet line to clamp the outlet line to the flanged outlet portion and bolts having keyed collars attached to the plate and bolted to the flanged outlet portion to raise and release the outlet line upon rotation of the bolts to permit movement of the movable casing section away from the stationary casing section, and means for moving the movable base member away from the stationary base member so as to separate the casing between the sections for inspection and repair of the pump.

7. A pump assembly comprising a volute casing having an upright flanged outlet portion and a flanged inlet portion distant therefrom adapted for connection with outlet and inlet fluid transport lines, said casing being split into a pair of casing sections through the outlet portion, one section supported on a stationary base member and the other section supported on a movable base member, a plate member having means for sealed connection with the outlet line, clamping means on said plate member for holding it in liquid sealed relation to the flanged outlet portion, an eccentric member arranged for raising the plate from the flanged outlet portion when the movable casing is being moved so as to leave the outlet line in substantially its normal location and for attachment to the flanged outlet portion on its return to the stationary position, and means for moving the movable base member away from the stationary base member so as to separate the casing between the sections for inspection and repair of the pump.

8. A pump assembly comprising a volute casing having an upright outlet portion and an inlet portion distant therefrom adapted for connection with outlet and inlet fluid transport lines, said outlet portion having a connection with a fluid transport outlet line, said casing being split into a pair of casing sections through said outlet portion, one said section having a stationary base member and the other section having a movable base member, means on one of said sections for moving the movable section axially toward and away from the stationary section, and means engaging the stationary section for raising a portion of said fluid transport outlet line away from the outlet portion of the movable section sufliciently to provide clearance therewith, whereby to permit said axial movement of the movable section so as to separate the casing between the sections for inspection and repair of the pump.

9. A pump assembly as set forth in claim 8 wherein said latter means is operable to lower the raised portion of the fluid transport outlet line to its original position.

10. A pump assembly as set forth in claim 8 wherein a separate flexible liner section is supported in each casing section.

11. A pump assembly as set forth in claim 8 wherein a separate flexible liner section is disposed in each casing section, each liner section extending through the outlet portion and overlapping a flange of the outlet portion and wherein said latter means is a connector assembly arranged to clamp the overlapping portion of the liner sections between the outlet flange and the fluid transport outlet line in one position and to separate the outlet line from the outlet flange and liner section of the movable section of the casing in the other position.

12. A pump assembly comprising a volute casing having an upright flanged outlet portion and a flanged inlet portign distant therefrom adapted for connection with outlet and inlet fluid transport lines, said casing being split into a pair of casing sections, a bed member inclusive of a pair of spaced upright side rails adapted to be secured on a supporting structure, a platform comprising a pair of complemental sections in abutting relationship in a common plane and having guide portions extending downwardly over the upper portion of said side rails in slip-fitting relationship to completely cover said rails during the normal operation of the pump whereby the rails are protected against deposits of foreign matter thereon, one said platform section disposed in supporting connection with one casing section, the other said platform section supporting the other casing section, and one said platform section having means for moving over the side rails toward and away from the other platform section in said common plane to separate the casing between its sections for inspection and repair of the pump.

References Cited by the Examiner UNITED STATES PATENTS 1,471,559 10/1923 Knauf 103-111 2,265,940 12/1941 Forrest 103-111 2,849,960 9/1958 Olmstead et a1. 103-111 2,853,018 9/1958 Stark 103-111 2,874,642 2/1959 Forrest 103-115 3,022,740 2/ 1962 Wilfley et al. 230-133 3,094,075 6/1963 Logue 103-114 3,131,642 5/1964 Geer et al. 103-114 FOREIGN PATENTS 113,706 9/1941 Australia.

652,423 4/ 1928 France.

163,019 6/ 1921 Great Britain.

SAMUEL LEVINE, Primary Examiner.

HENRY F. RADUAZO, Assistant Examiner.

Claims (1)

1. A PUMP ASSEMBLY COMPRISING A VOLUTE CASING HAVING AN UPRIGHT FLANGED OUTLET PORTION AND A FLANGED INLET PORTION DISTANT THEREFROM ADAPTED FOR CONNECTION WITH OUTLET AND INLET FLUID TRANSPORT LINES, SAID CASING BEING SPLIT INTO A PAIR OF CASING SECTIONS, A BED MEMBER ADAPTED TO BE SECURED ON A SUPPORTING STRUCTURE AND INCLUSIVE OF A PAIR OF SPACED UPRIGHT SIDE RAILS, A PLATFORM COVERING THE SPACE BETWEEN SAID SIDE RAILS AND HAVING GUIDE PORTIONS EXTENDING DOWNWARDLY OVER THE UPPER PORTION OF SAID SIDE RAILS IN SLIP-FITTING RELATIONSHIP, SAID PLATFORM BEING SPLIT INTO A PAIR OF PLATFORM SECTIONS WITH ONE PLATFORM SECTION MOVABLE OVER THE SIDE RAILS TOWARD AND AWAY FROM THE OTHER PLATFORM SECTION IN ALINED RELATIONSHIP, A PEDESTAL MEMBER SECURED ON EACH PLATFORM, ONE SAID PEDESTAL MEMBER DISPOSED IN SUPPORTNG CONNECTION WITH ONE CASING SECTION, THE OTHER SAID PEDESTAL MEMBER SUPPORTING THE OTHER CASING SECTION AND SHAFT DRIVE MEANS INCLUDING A SHAFT EXTENDING INTO THE VOLUTE CASING, AN IM-

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