Multitech 1777.8/7-10 G3 Radial bearing, Temperature of the rolling element bearings, Sizes 32 to

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Multitec

Radial bearing

Versions C and D are equipped with a deep-groove ball bearing as radial bearing. (The other versions are fitted with a plain bearing in the suction casing). The outer race of the deep-groove ball bearing must have axial play. The bearing is installed without spacer discs 551.1.

Fig. 42

7.4.4.1 Temperature of the rolling element bearings

Caution

The temperature of the rolling element bearings,

 

which run at 3000 1/min and more, can be 90￿C.

Manual temperature checks are not sufficient !

-The bearings only reach their normal operating temperature after several hours of operation.

-When a new pump is started up, the bearing temperature may exceed 95￿C. After 2 or 3 operating hours it will sink slowly and level out to a constant value after approx. 1 week.

-A temperature rise may occur after service activities

comprising replacement of the bearings or dismantling of the hydraulic system.

Should the temperature exceed 100￿C during start-up, switch off the pump and perform the following checks:

-Check whether the unit is correctly aligned.

-Remove the bearings, check grease quantity. Excessive amounts of grease will cause increased temperatures.

-Verify bearing type and arrangement (see 7.4.4.4)

-Re-start the pump. Ensure tight press fit between outer races and cover (fixed bearing).

7.5Re-adjusting the clearance gaps

7.5.1Maximum clearance gaps

The following max. clearances on the gap diameter apply:

D

Impellers 230 and 231

 

 

 

Suction side clearance gap

0.8 mm

 

 

Clearance gap at the hub

0.8 mm

 

 

Balance drum 59-4

0.8 mm

 

 

Suction casing 106.1 and

1.0 mm if the fluid is pumped

spacer sleeve 525.2 (C and D

from a vessel under vacuum

versions only)

conditions

 

2.5 mm for all other operating

 

conditions

Should wider clearances be found, the parts subject to wear must be replaced.

Note: Pump performance is adversely affected by excessive clearances. Losses in efficiency and discharge head will occur.

7.5.2Repairs

Clearance between impeller 231 and suction casing: Sizes 32 to 65 for material codes 10,11, 12, 13:

Re-working the suction casing and mounting a spare casing wear ring as per ZN 1095 and re-working the impeller.

For other pump sizes and material codes:

Replacing the casing wear ring 502.1 with a spare ring as per ZN 1095 and re-working the impeller.

Clearance between impeller 230 and disc 550.1 or casing wear ring 502.2

(Sizes 125 and 150):

Replacing the casing wear ring 502.2 with a spare ring as per ZN 1095 and re-working the impeller.

(Sizes 32 to 100):

Two repair methods are possible:

a)Replacing the impellers 230 and discs 550.1 by new ones. Quick repair method, no re-work of parts required.

b)Re-working the impellers 230 at the impeller eye by deposit welding and subsequently machining to the original diameter. This repair method is used for impellers made of stainless steel.

Clearance gaps between impeller 230 and diffuser:

a)Re-working the impellers at the sealing gaps of the hubs. Re-working the diffusers and installing an interstage bush as per ZN 140.

b)Should hub thickness be insufficient after re-working, replace the impeller or fit a spacer sleeve (see drawing below). The spacer sleeve must be driven by the impeller key. Make sure that the load-carrying key length in the impeller is at least 2/3 of the total (load-carrying) key length.

Fig. 43

Installation and returning to service

Please refer to the appropriate sections of these operating instructions.

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Contents Operating instructions 1777.8/7-10 G3 High-pressure pumps in ring-section designWorks No Type series Multitec Contents Multitec Index Section Adjusting dimensions for couplingMultitec General SafetyTransport, storage MultitecDescription Product AccessoriesFoundation / Checks to be carried out prior to installation Multitec Installation at siteInstalling the pump/unit Close-coupled pumpsBe tightened to the following torques Tightening torque Aligning the pump / drive Coupling guardThread Strength Drive Non-drive End 100 120 NmMax. permissible pipeline forces material codes 10, 11, 12 Connecting the pipingMax. permissible pipeline forces material codes 20 to Protection against foreign matterSetting the time relay Connection to power supplyVacuum balance line Checking the direction of rotationMultitec Commissioning, start-up / Shutdown Start-up Temperature of the fluid pumpedShutdown Gland packingReturning to service after storage Switching frequencyMinimum flows Density of fluid pumpedBearings and lubrication Multitec Servicing / maintenanceGeneral instructions PumpMotor Oil quality / Oil changeShaft seal Mechanical seal CouplingDismantling the non-drive-end bearings Plain bearing Dismantling the bearingsAxial suction nozzle Radial suction nozzleOil lubrication with lip seal fig Grease lubrication figsOil lubrication with labyrinth seal fig Grease lubricationReplacing the shaft protecting sleeve Removing a double-acting mechanical seal Dismantling the hydraulic system ReassemblyIntermediate bearing bush Intermediate bearing diffuser With the rules of sound engineering practiceStuffing box housing Reassembly of hydraulic systemSeals Gland packing Horizontal baseplate-mounted pump units Mechanical sealsSealing elements Leakage at the mechanical sealTightening the shaft nuts on Multitec pumps MTC 100/125/150 Fixed bearingRolling element bearing sizes Grease-lubricated bearings Re-adjusting the clearance gaps Maximum clearance gaps Temperature of the rolling element bearingsInstallation and returning to service Radial bearingMultitec Trouble-shooting Pump sizes 32 to General assembly drawingRadial suction nozzle Close-coupled pump up to pump sizeVertical design Pump sizes 32, 50 Pump sizes 100, 125Pump sizes 125 Description List of components525.1/2/4 Spacer sleeve 529Bild Achtung AttenzionKSB Aktiengesellschaft

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