compac seawater lubricated stern tube bearing system · thordonwater qualitypackage...

C O M P A CS E A W A T E R L U B R I C A T E DS T E R N T U B E B E A R I N G S Y S T E M

PIONEERS IN

SEAWATER LUBRICATED

BEARING TECHNOLOGY

Over fifty years ago, ship owners and managers made theconversion from seawater lubricated lignum vitae (a self

lubricating wood) to oil lubricated white metal stern tubebearings. Concern over the continued supply of quality lignum vitae,

and improvements in lip shaft sealing technology, facilitated thisdevelopment. As the majority of commercial ocean-going ships operatewith a propulsion system using a propeller shaft supported by oillubricated metal bearings with the oil contained in the stern tube by forwardand aft shaft seals, stern tube oil pollution has become a concern. Accordingto seal manufacturers, the seal must leak (aft-into the sea or forward-into theships bilge) at the shaft/seal interface in order for the seal to function properly.As well, simple fishing net or rope caught on a ships rotating shaft can alsodamage the aft seal allowing stern tube oil to flow out into the sea.

Using a proven, available technology, there is an alternative to an oil lubricatedsealed system that completely eliminates stern tube oil pollution and the risksassociated with it. A Thordon seawater lubricated COMPAC bearing system usesseawater as the lubrication medium in place of oil. The seawater is taken from thesea, pumped through COMPAC elastomeric polymer shaft bearings and returns tothe sea. No stern tube oil is needed.

STOP (STERN TUBE OIL POLLUTION)

During the last few decades, the pollution of the world’s oceans has become amatter of increasing international concerns. Zero tolerance for any kind of shipsource pollution is now becoming the norm and international regulations arebecoming more and more stringent.

Violations of international, national and local environment laws are resultingin numerous penalties - criminal (such as large fines or jail terms), civil andjudicial or administrative (such as loss of government contracts orpermits). These penalties can be applicable to any company or individualsuch as the master, the chief engineer, the owner, the operator, thecharterer of the ship and the Classification Society.

The safest way for today’s ship owners and managers to ensurethere is no risk of environmental violations is to completelyeliminate stern tube oil pollution by using COMPAC bearingslubricated with seawater. With over 30 years of bearingexperience using the proven principles of seawater

lubrication, Thordon’s COMPAC stern tubebearing system is a simple, reliable and

oil-free system.

To demonstrate to commercial ship owners

that modern seawater lubricated propeller

shaft bearing systems do offer wear life

predictability, reduced operating costs and

elimination of stern tube oil pollution risks,

Thordon Bearings has introduced a 15 year

bearing wear life guarantee for its COMPAC

seawater lubricated stern tube bearings.

Elastomeric polymer COMPAC stern tube

bearings, lubricated by a consistent supply of

conditioned water from Thordon’s integrated

Water Quality Package, ensure long,

predictable wear life and completely

eliminate stern tube oil as a potential

pollution source.

GOOD FOR THE SEA. GOOD FOR BUSINESS. GOOD FOR LIFE.

PIONEERS IN

SEAWATER LUBRICATED

BEARING TECHNOLOGY

Over fifty years ago, ship owners and managers made theconversion from seawater lubricated lignum vitae (a self

lubricating wood) to oil lubricated white metal stern tubebearings. Concern over the continued supply of quality lignum vitae,

and improvements in lip shaft sealing technology, facilitated thisdevelopment. As the majority of commercial ocean-going ships operatewith a propulsion system using a propeller shaft supported by oillubricated metal bearings with the oil contained in the stern tube by forwardand aft shaft seals, stern tube oil pollution has become a concern. Accordingto seal manufacturers, the seal must leak (aft-into the sea or forward-into theships bilge) at the shaft/seal interface in order for the seal to function properly.As well, simple fishing net or rope caught on a ships rotating shaft can alsodamage the aft seal allowing stern tube oil to flow out into the sea.

Using a proven, available technology, there is an alternative to an oil lubricatedsealed system that completely eliminates stern tube oil pollution and the risksassociated with it. A Thordon seawater lubricated COMPAC bearing system usesseawater as the lubrication medium in place of oil. The seawater is taken from thesea, pumped through COMPAC elastomeric polymer shaft bearings and returns tothe sea. No stern tube oil is needed.

STOP (STERN TUBE OIL POLLUTION)

During the last few decades, the pollution of the world’s oceans has become amatter of increasing international concerns. Zero tolerance for any kind of shipsource pollution is now becoming the norm and international regulations arebecoming more and more stringent.

Violations of international, national and local environment laws are resultingin numerous penalties - criminal (such as large fines or jail terms), civil andjudicial or administrative (such as loss of government contracts orpermits). These penalties can be applicable to any company or individualsuch as the master, the chief engineer, the owner, the operator, thecharterer of the ship and the Classification Society.

The safest way for today’s ship owners and managers to ensurethere is no risk of environmental violations is to completelyeliminate stern tube oil pollution by using COMPAC bearingslubricated with seawater. With over 30 years of bearingexperience using the proven principles of seawater

lubrication, Thordon’s COMPAC stern tubebearing system is a simple, reliable and

oil-free system.

To demonstrate to commercial ship owners

that modern seawater lubricated propeller

shaft bearing systems do offer wear life

predictability, reduced operating costs and

elimination of stern tube oil pollution risks,

Thordon Bearings has introduced a 15 year

bearing wear life guarantee for its COMPAC

seawater lubricated stern tube bearings.

Elastomeric polymer COMPAC stern tube

bearings, lubricated by a consistent supply of

conditioned water from Thordon’s integrated

Water Quality Package, ensure long,

predictable wear life and completely

eliminate stern tube oil as a potential

pollution source.

GOOD FOR THE SEA. GOOD FOR BUSINESS. GOOD FOR LIFE.

Thordon WaterQuality PackageA steady supply of seawater with thesignificant abrasives removed is animportant element in ensuring long,predictable, bearing wear life. With thisfactor in mind, Thordon has developeda self-contained supply, conditioningand monitoring package to ensure thatan adequate supply of clean water isconsistently being delivered to boththe forward seal and the bearings.

The Thordon Water Quality Package isdesigned to supply seawater to thestern tube bearings for lubrication andcooling at a minimum flow rate of0.15 litres/minute/mm (1 US gallon/

minute/inch) of shaft diameterand to condition seawaterfrom the water supply byremoving suspendedsolids greater than 50microns (0.002”) with aspecific gravity of 1.2 orhigher. Seawater is

sourced directly from theship’s sea bay, or alternately, from asuitable existing onboard supply.

A flow alarm is incorporated to alert theoperator to any low water flowcondition to the bearings. The ThordonWater Quality Package is designed tooperate on a stand-alone basis, or canbe fully integrated into the ship'scontrol and monitoring systems toallow operation in an unmannedmachinery space.

Shaft Liners

Since bearing “clearance” is the sum ofboth bearing wear, and wear of theshaft liner, a high quality shaft liner isan important component of a COMPACbearing system. Thordon Bearingsrecommends shaft liners made from agood quality centrifugally cast bronze,stainless steel or Inconel alloys. Weldclad Inconel or others acceptable toClassification Society Rules are alsopossible.

Thor-Coat Shaft CoatingIn a COMPAC seawater lubricatedbearing system, clean seawater is usedas the lubricant. Where the shaft isexposed to salt water, the shaft mustbe protected by a corrosion-resistantcoating.

Thor-Coat is a modified epoxy coatinghaving enhanced flexibility and nowoven fabric component. Thor-Coat isdesigned to provide 10 year or greaterintegrity – potentially eliminating theneed for the 5 year shaft withdrawaland inspection. Easily applied to athickness of 2mm, (0.079”) on theshaft, Thor-Coat is a one-coat product.

Forward SealThordon recommends a face seal or lipseal for use with the COMPAC seawaterlubricated stern tube bearing system.Thordon’s new Sea Thigor mechanicalface seal is a recommended option forshaft diameters up to 400mm (15.75”).A separate detailed brochure on theThordon Sea Thigor seal is available.

The Thordon COMPACStern Tube BearingSystem Includes:• COMPAC elastomeric polymer stern

tube bearings (with bearingcarriers when appropriate)

• Thordon Water Quality Package• Shaft liners• Thor-Coat shaft coating• Seawater lubricated forward seal

(Thordon can supply if requested)

COMPAC ElastomericPolymer SternTube BearingsThe bearing wear surface is ThordonCOMPAC, a non-metallic, elastomericpolymer alloy. To reduce start-upfriction and eliminate stick-slip,COMPAC’s formulation includesspecial lubricants to provide a lowcoefficient of friction. To promote early

formation of a hydrodynamic filmbetween the shaft and bearing, thelower (loaded) portion of the bearing issmooth, while the upper half of thebearing incorporates grooves for flowof the water lubricant/coolant.COMPAC bearings are approved by allmajor Classification Societies. The L/Dratio for COMPAC can be as low as 2:1for the bearing adjacent to thepropeller and 1:1 for all othersdepending upon the load and

operational requirements. If thebearings are to be aligned, and resinchocked into position, they should beinstalled in a metal carrier. A Thordontapered keyset can be provided toallow the bearing to be removed forinspection or replacement withoutremoving the shaft. The COMPACbearing is split and the key iscomprised of two parts sliding on ataper – a fixed section and a removablesliding section.

COMPAC Seawater LubricatedStern Tube Bearing System

Thordon WaterQuality PackageA steady supply of seawater with thesignificant abrasives removed is animportant element in ensuring long,predictable, bearing wear life. With thisfactor in mind, Thordon has developeda self-contained supply, conditioningand monitoring package to ensure thatan adequate supply of clean water isconsistently being delivered to boththe forward seal and the bearings.

The Thordon Water Quality Package isdesigned to supply seawater to thestern tube bearings for lubrication andcooling at a minimum flow rate of0.15 litres/minute/mm (1 US gallon/

minute/inch) of shaft diameterand to condition seawaterfrom the water supply byremoving suspendedsolids greater than 50microns (0.002”) with aspecific gravity of 1.2 orhigher. Seawater is

sourced directly from theship’s sea bay, or alternately, from asuitable existing onboard supply.

A flow alarm is incorporated to alert theoperator to any low water flowcondition to the bearings. The ThordonWater Quality Package is designed tooperate on a stand-alone basis, or canbe fully integrated into the ship'scontrol and monitoring systems toallow operation in an unmannedmachinery space.

Shaft Liners

Since bearing “clearance” is the sum ofboth bearing wear, and wear of theshaft liner, a high quality shaft liner isan important component of a COMPACbearing system. Thordon Bearingsrecommends shaft liners made from agood quality centrifugally cast bronze,stainless steel or Inconel alloys. Weldclad Inconel or others acceptable toClassification Society Rules are alsopossible.

Thor-Coat Shaft CoatingIn a COMPAC seawater lubricatedbearing system, clean seawater is usedas the lubricant. Where the shaft isexposed to salt water, the shaft mustbe protected by a corrosion-resistantcoating.

Thor-Coat is a modified epoxy coatinghaving enhanced flexibility and nowoven fabric component. Thor-Coat isdesigned to provide 10 year or greaterintegrity – potentially eliminating theneed for the 5 year shaft withdrawaland inspection. Easily applied to athickness of 2mm, (0.079”) on theshaft, Thor-Coat is a one-coat product.

Forward SealThordon recommends a face seal or lipseal for use with the COMPAC seawaterlubricated stern tube bearing system.Thordon’s new Sea Thigor mechanicalface seal is a recommended option forshaft diameters up to 400mm (15.75”).A separate detailed brochure on theThordon Sea Thigor seal is available.

The Thordon COMPACStern Tube BearingSystem Includes:• COMPAC elastomeric polymer stern

tube bearings (with bearingcarriers when appropriate)

• Thordon Water Quality Package• Shaft liners• Thor-Coat shaft coating• Seawater lubricated forward seal

(Thordon can supply if requested)

COMPAC ElastomericPolymer SternTube BearingsThe bearing wear surface is ThordonCOMPAC, a non-metallic, elastomericpolymer alloy. To reduce start-upfriction and eliminate stick-slip,COMPAC’s formulation includesspecial lubricants to provide a lowcoefficient of friction. To promote early

formation of a hydrodynamic filmbetween the shaft and bearing, thelower (loaded) portion of the bearing issmooth, while the upper half of thebearing incorporates grooves for flowof the water lubricant/coolant.COMPAC bearings are approved by allmajor Classification Societies. The L/Dratio for COMPAC can be as low as 2:1for the bearing adjacent to thepropeller and 1:1 for all othersdepending upon the load and

operational requirements. If thebearings are to be aligned, and resinchocked into position, they should beinstalled in a metal carrier. A Thordontapered keyset can be provided toallow the bearing to be removed forinspection or replacement withoutremoving the shaft. The COMPACbearing is split and the key iscomprised of two parts sliding on ataper – a fixed section and a removablesliding section.

COMPAC Seawater LubricatedStern Tube Bearing System

Zero Pollution RiskThe COMPAC seawater lubricated sterntube bearing system eliminates sterntube oil, as the lubricant is the seawater. There is no AFT seal, no storageof oil, no sampling of oil, no disposal ofstern tube oil and no worry ofingressing seawater contaminating theoil. Expensive, multiple chamber AFTseals designed to ‘trap’ oil leakage anddrain it inboard for further processingand disposal are not required.Thordon’s COMPAC system ensuresship owners/operators that there willbe no environmental violationsresulting from stern tube oil leakage.

Lower Life Cycle CostsCOMPAC seawater lubricated stern tubebearings typically may mean a higherup-front cost initially than comparableoil lubricated white metal stern tubebearing systems due to the need forbronze shaft liners and corrosion

Ship Owner Benefits

Proven LongBearingWear Life

Bearing wear data hasbeen recorded forseveral ships withshaft diameters over500mm (20“) that havebeen operating withthe COMPAC bearingsystem for at least 5years. Results haveshown the bearingsare expected to last 15to 20 years as pointedout in the charts fortwo major cruise lineoperators.

15 Year COMPAC Stern Tube Bearing WearLife Guarantee*

In newbuild applications, the ship owner must clearly specify the complete COMPAC system (including ThordonWater Quality Package, Thor-Coat and approved shaft liners) to the ship yard in order to qualify for the 15 yearwear life guarantee. The Thordon COMPAC Stern Tube Bearing System is guaranteed to meet ClassificationSociety stern tube bearing wear specifications for 15 years or Thordon Bearings Inc. will supply new bearings freeof charge. The guarantee is limited to the supply of replacement bearings delivered to the ship. It does notinclude replacement of any other Thordon supplied components nor any drydocking or installation costs. A copyof the specification is available from Thordon Bearings Inc.

The bearing guarantee is available for commercial newbuild vessels with shaft diameters of 300mm (12”) orgreater and COMPAC bearings enclosed in stern tubes. Standard operating parameters as specified by ThordonBearings (for example – system maintenance, minimum water flows, etc.) must be provided and maintained bythe ship owner. The guarantee is limited to the owner of the ship. Full details of the 15 year guarantee areavailable from Thordon Bearings Inc.

* The guarantee is subject to prior approval by Thordon Bearings Inc. and limited to the supply of replacement bearing(s).

0.00 4 6 82 10 20 2214 1812 16

THORDON COMPAC WATER LUBRICATED PROPELLERSHAFT BEARING WEAR (For Disney Magic)

Maximum Allowable Wear *

*Based on Classification Societies maximum clearance recommendationfor 615 mm (24") shafts

Current WearTo Date

(Oct. 2005)

0.00 4 6 82 10 20 2214 1812 16

THORDON COMPAC WATER LUBRICATED PROPELLERSHAFT BEARING WEAR (For Grand Princess)

*Based on Classification Societies maximum clearance recommendationfor 642 mm (25.25") shafts

Current WearTo Date

(Oct. 2006)Avg of port and

starboard bearing wear

Ship Owner Benefits

Zero Pollution RiskThe COMPAC seawater lubricated sterntube bearing system eliminates sterntube oil, as the lubricant is the seawater. There is no AFT seal, no storageof oil, no sampling of oil, no disposal ofstern tube oil and no worry ofingressing seawater contaminating theoil. Expensive, multiple chamber AFTseals designed to ‘trap’ oil leakage anddrain it inboard for further processingand disposal are not required.Thordon’s COMPAC system ensuresship owners/operators that there willbe no environmental violationsresulting from stern tube oil leakage.

Lower Life Cycle CostsCOMPAC seawater lubricated stern tubebearings typically may mean a higherup-front cost initially than comparableoil lubricated white metal stern tubebearing systems due to the need forbronze shaft liners and corrosion

Ship Owner Benefits

Proven LongBearingWear Life

Bearing wear data hasbeen recorded forseveral ships withshaft diameters over500mm (20“) that havebeen operating withthe COMPAC bearingsystem for at least 5years. Results haveshown the bearingsare expected to last 15to 20 years as pointedout in the charts fortwo major cruise lineoperators.

15 Year COMPAC Stern Tube Bearing WearLife Guarantee*

In newbuild applications, the ship owner must clearly specify the complete COMPAC system (including ThordonWater Quality Package, Thor-Coat and approved shaft liners) to the ship yard in order to qualify for the 15 yearwear life guarantee. The Thordon COMPAC Stern Tube Bearing System is guaranteed to meet ClassificationSociety stern tube bearing wear specifications for 15 years or Thordon Bearings Inc. will supply new bearings freeof charge. The guarantee is limited to the supply of replacement bearings delivered to the ship. It does notinclude replacement of any other Thordon supplied components nor any drydocking or installation costs. A copyof the specification is available from Thordon Bearings Inc.

The bearing guarantee is available for commercial newbuild vessels with shaft diameters of 300mm (12”) orgreater and COMPAC bearings enclosed in stern tubes. Standard operating parameters as specified by ThordonBearings (for example – system maintenance, minimum water flows, etc.) must be provided and maintained bythe ship owner. The guarantee is limited to the owner of the ship. Full details of the 15 year guarantee areavailable from Thordon Bearings Inc.

* The guarantee is subject to prior approval by Thordon Bearings Inc. and limited to the supply of replacement bearing(s).

0.00 4 6 82 10 20 2214 1812 16

THORDON COMPAC WATER LUBRICATED PROPELLERSHAFT BEARING WEAR (For Disney Magic)

*Based on Classification Societies maximum clearance recommendationfor 615 mm (24") shafts

Current WearTo Date

(Oct. 2005)

0.00 4 6 82 10 20 2214 1812 16

THORDON COMPAC WATER LUBRICATED PROPELLERSHAFT BEARING WEAR (For Grand Princess)

*Based on Classification Societies maximum clearance recommendationfor 642 mm (25.25") shafts

Current WearTo Date

(Oct. 2006)Avg of port and

starboard bearing wear

Ship Owner Benefits

protection of the shaft. However, with theelimination of aft seal maintenance andstern tube oil costs, the up-front costsare recoupedwith lower in-service costs.Based on existing user experience ofCOMPAC seawater lubricated propellershaft bearings, overall life cycle costshave been reduced compared to oilsystems for these ship owners.

Controlled BearingEnvironment

Thordon’s Water Quality Packageensures an adequate supply of cleanwater is consistently being delivered toboth the forward seal and the bearings.Lubrication of the bearing is assured anda long predictable bearing wear life isachieved. A controlled supply of cleanwater allows Thordon to offer a 15 yearbearing wear life guarantee.

Extensive ReferencesThordon COMPAC propeller shaftbearing systems are extensively usedin over 500 commercial, naval andcoast guard applications. Today,commercial ship owners and operatorsaround the world have chosen COMPACfor its pollution-free simplicity andproven reliability. Reference lists andorders of commercial ships equippedwith COMPAC seawater lubricatedstern tube bearings are available fromThordon Bearings Inc.

Simple Design forNewbuilds andConversionsThe COMPAC system was developedfrom improvements in non-metallicmaterials and bearing designcombined with the proven principles ofwater lubrication technology and thathas existed since the earliest days ofshaft driven propellers. The seawateris sourced from the ship’s sea bay,pumped to the forward section of thestern tube just aft of the seal, throughthe forward and then aft bearings, andreturns to the sea.

IncreasedTolerance ToMisalignment& Edge LoadingAs a Thordon COMPACbearing is 50 timesmore elastic than whitemetal and 3 times morecompliant than othercommon non-metallicpropeller shaft bearings,COMPAC deflects slightlyunder edge loading.The load is spread, andthe localized pressure on the bearing is reduced, eliminating the bearing wipingthat often occurs under these conditions.

Contact Length

TYPICAL EDGE LOADING PROFILE

Lead Based White Metal Typical Non-Metallic Thordon COMPAC

Projected Bearing Wear by Volume (cc/24 Hours)(Independent Testing at University of Cincinnati, USA)

0.01 0.05 0.1 0.5 1 5 10 50 100

Cotton Phenolic

Virgin Teflon

Acetal

Lignum Vitae

Asbestos Phenolic

Nylon 612

Thordon XL

Thordon SXL/COMPAC

Rubber

Thordon Composite

TYPICAL BEARING ABRASIVE WEAR RATESAbrasionResistantDue to its elastomericproperties, the ThordonCOMPAC bearing tendsto deflect and thenreject small abrasiveparticles, allowing themto be flushed throughthe bearing withoutbecoming embedded.

Lower FrictionThan OilThordon COMPAC sterntube bearings have beendesigned to reducerunning friction andimprove low speedhydrodynamic filmdevelopment. The lower(loaded) portion of theCOMPAC bearing issmooth and the upperhalf is designed with water grooves for lubrication and cooling. Although start-upfriction is initially higher, at rated shaft speeds drag on the rotating shaft resultingfrom the viscosity of the lubricating fluid is lower with water than with oil, resultingin potential fuel savings.

Reduced Time in Dockwith Single Key DesignThordon COMPAC’s unique singletapered key design allows inspectionor renewal of the bearings with theshaft in place. Originally developed forDisney Cruise Lines, the split bearingdesign allows the bearings to bewithdrawn, inspected and reinstalledin a few hours.

Survivability

If a serious bearing failure occurs witha white metal or reinforced plasticbearing, significant heat is oftenproduced and there can be damage tothe shaft as well as the bearing. As theThordon COMPAC polymer softens at alower temperature than metallic orother non-metallic bearing materials,excessive amounts of heat are notproduced in failure mode and shaftdamage is avoided.

Easily Machinedand Fitted

Thordon COMPAC machines cleanlyand produces no airborne machiningdebris. COMPAC is much lighter thanwhite metal bearings and can be fittedquickly and easily by freezing inliquid nitrogen.

protection of the shaft. However, with theelimination of aft seal maintenance andstern tube oil costs, the up-front costsare recoupedwith lower in-service costs.Based on existing user experience ofCOMPAC seawater lubricated propellershaft bearings, overall life cycle costshave been reduced compared to oilsystems for these ship owners.

Controlled BearingEnvironment

Thordon’s Water Quality Packageensures an adequate supply of cleanwater is consistently being delivered toboth the forward seal and the bearings.Lubrication of the bearing is assured anda long predictable bearing wear life isachieved. A controlled supply of cleanwater allows Thordon to offer a 15 yearbearing wear life guarantee.

Extensive ReferencesThordon COMPAC propeller shaftbearing systems are extensively usedin over 500 commercial, naval andcoast guard applications. Today,commercial ship owners and operatorsaround the world have chosen COMPACfor its pollution-free simplicity andproven reliability. Reference lists andorders of commercial ships equippedwith COMPAC seawater lubricatedstern tube bearings are available fromThordon Bearings Inc.

Simple Design forNewbuilds andConversionsThe COMPAC system was developedfrom improvements in non-metallicmaterials and bearing designcombined with the proven principles ofwater lubrication technology and thathas existed since the earliest days ofshaft driven propellers. The seawateris sourced from the ship’s sea bay,pumped to the forward section of thestern tube just aft of the seal, throughthe forward and then aft bearings, andreturns to the sea.

IncreasedTolerance ToMisalignment& Edge LoadingAs a Thordon COMPACbearing is 50 timesmore elastic than whitemetal and 3 times morecompliant than othercommon non-metallicpropeller shaft bearings,COMPAC deflects slightlyunder edge loading.The load is spread, andthe localized pressure on the bearing is reduced, eliminating the bearing wipingthat often occurs under these conditions.

Contact Length

TYPICAL EDGE LOADING PROFILE

Lead Based White Metal Typical Non-Metallic Thordon COMPAC

Projected Bearing Wear by Volume (cc/24 Hours)(Independent Testing at University of Cincinnati, USA)

0.01 0.05 0.1 0.5 1 5 10 50 100

Cotton Phenolic

Virgin Teflon

Acetal

Lignum Vitae

Asbestos Phenolic

Nylon 612

Thordon XL

Thordon SXL/COMPAC

Rubber

Thordon Composite

TYPICAL BEARING ABRASIVE WEAR RATESAbrasionResistantDue to its elastomericproperties, the ThordonCOMPAC bearing tendsto deflect and thenreject small abrasiveparticles, allowing themto be flushed throughthe bearing withoutbecoming embedded.

Lower FrictionThan OilThordon COMPAC sterntube bearings have beendesigned to reducerunning friction andimprove low speedhydrodynamic filmdevelopment. The lower(loaded) portion of theCOMPAC bearing issmooth and the upperhalf is designed with water grooves for lubrication and cooling. Although start-upfriction is initially higher, at rated shaft speeds drag on the rotating shaft resultingfrom the viscosity of the lubricating fluid is lower with water than with oil, resultingin potential fuel savings.

Reduced Time in Dockwith Single Key DesignThordon COMPAC’s unique singletapered key design allows inspectionor renewal of the bearings with theshaft in place. Originally developed forDisney Cruise Lines, the split bearingdesign allows the bearings to bewithdrawn, inspected and reinstalledin a few hours.

Survivability

If a serious bearing failure occurs witha white metal or reinforced plasticbearing, significant heat is oftenproduced and there can be damage tothe shaft as well as the bearing. As theThordon COMPAC polymer softens at alower temperature than metallic orother non-metallic bearing materials,excessive amounts of heat are notproduced in failure mode and shaftdamage is avoided.

Easily Machinedand Fitted

Thordon COMPAC machines cleanlyand produces no airborne machiningdebris. COMPAC is much lighter thanwhite metal bearings and can be fittedquickly and easily by freezing inliquid nitrogen.

CC 09/08 3000 BCPRINTED IN CANADA

ISO 9001:2000CGSBRegistration #93649

Your local Thordon Distributor

3225 Mainway, Burlington, Ontario L7M 1A6 Canada

Tel: (905) 335-1440 Fax: (905) 335-4033

E-mail [email protected]

www.thordonbearings.com

Customer Focused To SupportYour Immediate And Future Needs

Supply and Service: Geared to provide

quick response to customer needs, Thordon

Bearings understands the importance of

fast delivery and reduced down time.

Thordon marine and industrial bearings can

be designed, produced to the exact

requirements of the customer and shipped

quickly.

Distribution: With Thordon bearings

specified all around the world, an extensive

distribution network has been established

in over 70 countries. Inventories of common

bearing sizes are stocked by local Thordon

Distributors and are backed up by large

regional and head office Thordon stocks.

Application Engineering: Thordon

Bearing’s engineers work closely with

customers to provide innovative bearing

system designs that meet or exceed the

technical requirements of the application.

Manufacturing: Thordon’s modern

polymer processing facility is staffed with

experienced and dedicated employees.

Bearings up to 2.2 m (86") in diameter have

been supplied and bearings up to 1.5 m

(60") O.D. can be machined in-house.

Quality: Thordon Bearings Inc. is a

Canadian company manufacturing to ISO

9001:2000 Quality System requirements.

With over 35 years experience in polymer

bearing design, application engineering

and manufacturing, Thordon marine and

industrial bearings are recognized worldwide

for both quality and performance.

Research and Development: Thordon

bearings are being continuously tested by

our Bearing Test Facility. The Facility

evaluates new designs and applications

before they are put into service. Ongoing

testing not only allows for design

refinements, but ensures quality and

performance after installation. Our polymer

laboratory evaluates new and modified

polymers in a continuing quest to improve

Thordon bearing performance and searches

for new polymer bearing solutions.

compac seawater lubricated stern tube bearing system · thordonwater qualitypackage...

Documents