October 30, 2007 © SKF Group Slide 0. October 30, 2007 © SKF Group Slide 1 Offer description The SKF three-barrier solution.

October 30, 2007 © SKF Group Slide 1


Offer descriptionThe SKF three-barrier solution


Contaminated environment

Very Harsh18%

Harsh29%Contaminated

28%

Clean25%

Bearing environment


Bearing failure due to contamination

October 30, 2007 © SKF Group Slide 5 October 30, 2007 © SKF Group Slide 5

SKF three-barrier solution– a cost efficient, heavy duty sealed bundle

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= the basis of the SKF three-barrier solution…


SKF three-barrier solution

Labyrinth seal Labyrinth seal

Sealed spherical roller bearingGrease fillingGrease filling


SKF three-barrier solution

1 12 23 3


Value proposition – OEM and AM

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• Sleeves for sealed units - full range

Conveyor unit – sealed spherical roller bearing

• New and attractive range for the conveyor industry

• Cylindrical and tapered bore

• On stock for the main variant

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• New environmentally friendly grease to be used in SKF or customer housing. Acts as the third protection

Slide from ConveyorNMO 2007




When needed SKF provides SNL housings

Standard S seal or Lseal for the housing.

Less need for taconite

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• Compact solution and downsizing (OEM)

• Simplified design process. Reduced width in solution

- no need for taconite (OEM)The new offer will: • Reduce maintenance. Reduce cost of

handlinggrease (purchase, use, destruction) (AM)

• Improve service life. MTBF (AM) by higher cleanliness (AM) and by avoiding contamination at assembly (OEM/AM)

The solution is also:

• Environmentally friendly (OEM/AM) and brings a higher degree of “health & safety” to the application (OEM/AM)



Value Proposition – OEM and AM

Prolong the service life of the conveyor unit.

The SKF sealed spherical roller bearing will exceed the expected life of the pulley lagging (coating).



Seal knowledge

The cavity between the two seals should be filled with grease to prevent contamination from entering the bearing

”Three barriers”• Labyrinth seal as a primary seal• Bearing seal as a secondary seal• Grease fill in cavity for harsh conditions

In a normal design with ”open” bearing the same grease is used to fill the house and to lubricate the bearing.

This means that as soon as the contaminant (particles, air, water) passes the outer seal it will start to effect the lubrication of the bearing.

Particles can enter the rolling contact and create damages. Air will start to detoriate the lubrication ability of the grease and give shorter life. Water can start to corrode the surfaces.

All this implies that you need a very good outer seal. A one seal system is also very risky to use since as soon as you get a damage on the seal it will fail to work.

With a Sealed SRB and the three barrier system you have the option to use different grease than the bearing grease to fill the house. It can be a low cost, high performance, or as SKF recommends, a biodegradable grease (LGGB2).

The function of the bearing will be as good as it gets since the bearing grease has been selected and developed by SKF for the sealed SRB. It is filled in a clean factory environment with the right amount, the right proceedure and at the right place inside the bearing.



Sealed SRB

23-04-18 ©SKF Slide 13 SKF Mining, Mineral Processing & Cement

Sealed SRB increases Mean Time Between Failure - MTBF (longer service life)

• Decrease in Maintainance To Repair (MTTR)

solutions as split SRB, have limited value compared to increase in MTBF

MTBF

Relia

bili

ty

Time

Sealed SRB increases MTBF

Decrease MTTR

has limited valueMTTR

• Real Value is to increase MTBF


October 30, 2007 © SKF Group Slide 0. October 30, 2007 © SKF Group Slide 1 Offer description The SKF three-barrier solution.

Documents

skf group slide

contamination slide

taconite slide

protection slide

barrier solution slide

bearing environment

grease filling slide

application oemam slide