Multitech 1777.8/7-10 G3 Mechanical seals, Horizontal baseplate-mounted pump units

Page 22

Multitec

Mechanical seals

Caution

Mechanical seals are precision components. The

 

seat ring and the spring-loaded ring must always

be replaced together, i.e. always replace the entire mechanical seal.

To ensure trouble-free operation of the mechanical seal, the seal faces and the tools must be absolutely clean. Mechanical seals must be installed with utmost care.

The contact faces shall only be cleaned immediately before assembly takes place. They must not be greasy (grease, smudges ...) or damaged.

Individual seal components such as O-rings made of EPDM must never come into contact with oil or grease.

Mechanical seal reassembly is effected in reverse order to dismantling.

When mounting the spring-loaded ring, we recommend to wet the shaft protecting sleeve with clean fluid handled.

The seat ring and the spring-loaded ring shall always be mounted by hand resp. fingers, making sure that pressure is applied evenly, without tilting.

Horizontal baseplate-mounted pump units

Caution

On pump versions C and D, the correct direction

 

of rotation must be observed for mechanical

seals with uni-directional springs.

Left--hand spring

 

Right--hand spring

 

Shaft

 

Shaft

 

rotation:

 

 

 

rotation:

 

anti-clock-

View

 

clockwise

 

wise

towards

 

 

the spring- loaded ring

Fig. 39

Sealing elements

Caution Sealing elements made of EPDM must never

come into contact with oil or grease.

Defective O-rings (which have sustained mechanical damage such as cuts, cracks and deformation as well as changes in properties from deposits or embrittlement) must be replaced. Gaskets shall always be replaced by new ones.

If possible, the gasket shall be mounted without the use of mounting aids like grease or adhesives, unless authorized mounting aids are used.

22

7.4.3.1 Leakage at the mechanical seal

-Check axial alignment of the seal.

-Inspect gasket 400.1.

-Remove seal cover 471.1 (471.2 for bellows-type seals) and check position of seat ring in the seal cover.

-Check the O-ring on sleeve 523.1.

-Check O-ring 412.4.

7.4.4Bearings

Plain bearing

in installation types A - B - E / Ex - F / Fx - V / Vx are re-installed in reverse order to dismantling.

Rolling element bearings

The rolling element bearings are generally mounted on the bearing sleeve and tightened with shaft nut 920.2 / 920.6 / 920.7.

They are re-installed in reverse order to dismantling. The position of the keywayed nuts 920.6 (contact surface = plane surface with recess) marked during dismantling (7.3.3.2) must be complied with.

Check the concentricity and face run-out of ring 500.1 with a dial gauge for variants with oil lubrications.

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Contents Operating instructions 1777.8/7-10 G3 High-pressure pumps in ring-section designWorks No Type series Multitec Contents Section Adjusting dimensions for coupling Multitec IndexSafety Multitec GeneralMultitec Transport, storageAccessories Description ProductInstalling the pump/unit Multitec Installation at siteFoundation / Checks to be carried out prior to installation Close-coupled pumpsThread Strength Drive Non-drive End Aligning the pump / drive Coupling guardBe tightened to the following torques Tightening torque 100 120 NmMax. permissible pipeline forces material codes 20 to Connecting the pipingMax. permissible pipeline forces material codes 10, 11, 12 Protection against foreign matterVacuum balance line Connection to power supplySetting the time relay Checking the direction of rotationMultitec Commissioning, start-up / Shutdown Shutdown Temperature of the fluid pumpedStart-up Gland packingMinimum flows Switching frequencyReturning to service after storage Density of fluid pumpedGeneral instructions Multitec Servicing / maintenanceBearings and lubrication PumpShaft seal Mechanical seal Oil quality / Oil changeMotor CouplingAxial suction nozzle Dismantling the bearingsDismantling the non-drive-end bearings Plain bearing Radial suction nozzleOil lubrication with labyrinth seal fig Grease lubrication figsOil lubrication with lip seal fig Grease lubricationReplacing the shaft protecting sleeve Removing a double-acting mechanical seal Intermediate bearing bush Intermediate bearing diffuser ReassemblyDismantling the hydraulic system With the rules of sound engineering practiceStuffing box housing Reassembly of hydraulic systemSeals Gland packing Sealing elements Mechanical sealsHorizontal baseplate-mounted pump units Leakage at the mechanical sealTightening the shaft nuts on Multitec pumps MTC 100/125/150 Fixed bearingRolling element bearing sizes Grease-lubricated bearings Installation and returning to service Temperature of the rolling element bearingsRe-adjusting the clearance gaps Maximum clearance gaps Radial bearingMultitec Trouble-shooting General assembly drawing Pump sizes 32 toVertical design Pump sizes 32, 50 Close-coupled pump up to pump sizeRadial suction nozzle Pump sizes 100, 125Pump sizes 125 525.1/2/4 Spacer sleeve List of componentsDescription 529Achtung Attenzion BildKSB Aktiengesellschaft

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