www.marsh.ca www.marsh.com
Gearless Mill Drives
Machinery Risk Solutions Practice
2009
Matt Dugalic P.Eng., MARSH – MRSP Risk Consultant, VPKurt Tischler Dipl.-Ing., Siemens – Product Manager, Mining
1Marsh
WHY shift to the gearless drives in mineral processing ???
Mill size – grinding economies of scale
Relative lifecycle cost
Lower power consumption
Robust design
Avoiding critical open gear power trains
Variable speed
Compatibility with processing plants
Engineering design efficiencies
Availability
Minimal downtime
2Marsh
However,
from the machinery breakdown underwriting perspective, this
often creates a
critical, single point exposure !!!
3Marsh
Significant Mining Industry Property Losses (Jan 2006 – Jul 2009)
Class Loss Type Gross Claim
(MM US$)
Coal Flood +/- 603
Coal Flood +/- 550
Coal Flood +/- 450
Iron Storm / Flooding +/- 180
Manganese Smelter Explosion +/- 170
Platinum Flood +/- 140.3
Iron / Salt Typhoon (Glenda) +/- 122.4
Copper & Zinc Electrical Flashovers of SAG Mill Stator +/- 115
Iron / Salt Typhoon (Emma) +/- 107.7
. . .Siemens
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Confidential / Copyright © Siemens AG 2009
SIMINE Mill Gearless Drive
Siemens’ Gearless Drive Technology
Performance
Facts & Figures
Page 2 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Content
Experience & References (5 minutes)
Maintenance, Service (2 minutes)
Major Problems and their Solutions (25 minutes)Cadia, Repairs, Lessons learned Chilean plant, Rotor failure
Performance: Downtime; Availability (10 minutes)
SIMINE Mill Gearless Drive Performance
Page 3 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Sydvaranger Norway
Gearless Drive 8200 kWfor a Ballmill of 21.3 ft ID
Start-up: 1980
SIMINE Mill Gearless Drive Experience First Gearless Drive in Mining
Page 4 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Sydvaranger Norway
Gearless Drive 8200 kWfor a Ballmill of 21.3 ft ID
Start-up: 1980
History:
1997: Shutdown of plantdue to low iron prices
2005: Mill and Gearless Drive sold to Zinifex Australia
SIMINE Mill Gearless Drive Experience
Page 5 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Sydvaranger Norway
Gearless Drive 8200 kWfor a Ballmill of 21.3 ft ID
Start-up: 1980
History:
1997: Shutdown of plantdue to low iron prices
2005: Mill and Gearless Drive sold to Zinifex Australia
2008: Restart in Zinifex’Century Zinc Plant
SIMINE Mill Gearless Drive Experience
Page 6 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Start-up:1988
Altitude:3000 m
CODELCO Chuquicamata, 2 GD 8210kW, 32’First SAG-Mill Gearless Drives
Page 7 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Start-up:1991
CODELCO El Teniente, GD 12000 kW First 36’ SAG-Mill Gearless Drive
Page 8 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Start-up:1997
Altitude:2700 m
Freeport II; Indonesia, 20400 kW First 38’ SAG-Mill Gearless Drive
Page 9 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Start-up:1998
Cadia Australia, GD 20000 kW, First 40’ SAG-Mill Gearless Drives
Page 10 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
kW233,542Total Power20 Gearless Drives
19808,20021.3Ball-MillNorwaySYDVARANGER
19888,21032SAG-MillChileCHUQUICAMATA 1
19898,21032SAG-MillChileCHUQUICAMATA 2
199011,20036SAG-MillChileEL TENIENTE
19904,00016.4AG-MillSouth AfricaGOLDFIELDS 1
19904,00016.4AG-MillSouth AfricaGOLDFIELDS 2
199112,00036SAG-MillUSAKENNECOTT
19919,65021.3AG-MillRussiaNORILSK NICKEL 1
19919,65021.3AG-MillRussiaNORILSK NICKEL 2
199312,00036SAG-MillChileCANDELARIA 1
199510,60034SAG-MillIndonesiaFREEPORT 1
199713,40036SAG-MillArgentinaALUMBRERA 1
199713,40036SAG-MillArgentinaALUMBRERA 2
199720,40038SAG-MillIndonesiaFREEPORT 2
199712,00036SAG-MillChileCANDELARIA 2
199913,31136SAG-MillChilePELAMBRES 2
199913,31136SAG-MillChilePELAMBRES 1
199818,00038AG-MillAustraliaOLYMPIC DAM
199812,00036SAG-MillChileANDINA
199820,00040SAG-MillAustraliaCADIA
Rated Power (kW) Start-upID of Mill (ft)Type of MillCountryPlant
SIMINE Mill Gearless Drive References
Page 11 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
kW520,310Total Power39 Gearless Drives
Scheduled 201122,00040SAG-MillChileANGLO Los Bronces
Project stopped20,00038SAG-MillVenezuelaLas Brisas
233,54220 above
200713,05036SAG-MillBoliviaSAN CRISTOBAL20077,83022Ball-MillBoliviaSAN CRISTOBAL20077,83022Ball-MillBoliviaSAN CRISTOBAL200319,40038SAG-MillChileEL TENIENTE200311,18624Ball-MillChileEL TENIENTE200311,18624Ball-MillChileEL TENIENTE200611,18624Ball-MillChileEL TENIENTE200612,50036SAG-MillAustraliaBarrick Cowal
200610,50022Ball-MillAustraliaBarrick Cowal
200818,00038SAG-MillZambiaEquinox Lumwana200815,00026Ball-MillZambiaEquinox Lumwana200820,00038SAG-MillBrazilRPM Kinross
Project stopped20,00038SAG-MillVenezuelaLas BrisasScheduled 201015,50026BallmillChileLos PelambresScheduled 201015,00036SAG-MillChileLos PelambresScheduled 201018,30038SAG-MillMéxicoPeñasquitoScheduled 200918,30038SAG-MillMéxicoPeñasquito
Rated Power (kW) Start-upID of Mill (ft)Type of MillCountryPlant
SIMINE Mill Gearless Drive References
Page 12 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Scheduled 201128,00040SAG-MillAustraliaCP –MiningScheduled 201028,00040SAG-MillAustraliaCP –MiningScheduled 201028,00040SAG-MillAustraliaCP –MiningScheduled 201028,00040SAG-MillAustraliaCP –MiningScheduled 201028,00040SAG-MillAustraliaCP –MiningScheduled 200928,00040SAG-MillAustraliaCP –Mining
Scheduled 201116,40026SAG-MillChileANGLO Los Bronces
kW892,942Total Power58 Gearless Drives
Project stopped15,70026BallmillChileEscondida
Project stopped15,70026BallmillChileEscondida
520,310 above39 above
Scheduled 200928,00040SAG-MillAustraliaCP –Mining
Scheduled 201124,00040SAG-MillPeruXstrata Las Bambas
Scheduled 201116,40026BallmillPeruXstrata Las BambasScheduled 201116,40026BallmillPeruXstrata Las BambasProject stopped14,00034SAG-MillAustraliaAurox Balla Balla
Project stopped15,70026BallmillChileEscondidaProject stopped22,00040SAG-MillChileEscondidaScheduled 201111,19024BallmillPeruAntamina Scheduled 201120,14238SAG-MillPeruAntamina Project stopped17,00026Ballmill AustraliaAurox Balla Balla
Rated Power (kW) Start-upID of Mill (ft)Type of MillCountryPlant
SIMINE Mill Gearless Drive References
Page 13 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Project stopped15,70026BallmillChileEscondida
Scheduled 201116,40026BallmillPeru or ChileXstrata 2Scheduled 201116,40026BallmillPeru or ChileXstrata 2Scheduled 201124,00040SAG-MillPeru or ChileXstrata 2
Project stopped15,70026BallmillChileEscondida
kW1’003,920Total Power64 Gearless Drives
892,942 above58 above
Project stopped15,70026BallmillChileEscondida
Rated Power (kW) Start-upID of Mill (ft)Type of MillCountryPlant
SIMINECIS Mill gearless drivesReferences
in operation: 33
in fabrication or installation: 21
project stopped: 4
order cancelled: 6
Page 14 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
SIMINE Mill Gearless DriveClarification
No flashovers in Siemens’ SAG-Mill Stators
Page 15 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Collahuasi Chile: 40’ Gearless Mill Drive NOT Siemens supply
Escondida Chile: 38’ Gearless Mill Drive NOT Siemens supply
Escondida Chile: 25’ Gearless Mill Drives NOT Siemens supply
Antamina Peru: 38’ Gearless Mill Drive NOT Siemens supply
Antamina Peru: 24’ Gearless Mill Drives NOT Siemens supply
SIMINE Mill Gearless DriveClarification
Page 16 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
SIMINE Mill GDExperience
Mill
Diameter16’ 21’ 24’22’ 32’ 34’ 36’ 38’ 40’
Ball-Mills SAG-Mills
1
2
3
4
5
6
7
8
9
10
Number
Gold-fields
Kolskaya
Syd-varanger
SanCristobal
Cowal
AntaminaEl
Teniente
Chuqui-camata Balla Balla
Freeport
PelambresSan Cristobal
Cowal Pelambres
AndinaAlumbreraCandelariaKennecottEl Teniente
AntaminaLas BrisasParacatu
PeñasquitoLumwana
El TenienteOlympic Dam
Freeport
26’
Xstrada 2Antapaccay Pelambres
Los BroncesLumwana
11
Xstrada 2AntapaccayCP-Mining
Los BroncesCadia
Page 17 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Total Operation hours
SIMINE Mill GD in Mining:
Machine years307
until September 2009
SIMINE Mill Gearless Drive Experience
Page 18 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Total Operation hours
SIMINE Mill GD in Mining:
Machine days105,000
until September 2009
SIMINE Mill Gearless Drive Experience
Page 19 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Content
Experience & References (5 minutes)
Maintenance, Service (2 minutes)
Major Problems and their Solutions (25 minutes)Cadia, Repairs, Lessons learned Chilean plant, Rotor failure
Performance: Downtime; Availability (10 minutes)
SIMINE Mill Gearless Drive Performance
Page 20 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Preventive Maintenance of Gearless Drive is performed during downtime for Mill Maintenance
No additional downtime for preventive Maintenance of Gearless Drive
SIMINE Mill Gearless Drive Maintenance, Service
Page 21 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
SIMINE Mill Gearless Drive Recommended Maintenance Schedule
Page 22 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Preventive maintenance recommended
Four (4) actions (in total 13 minutes) once per month, during operation,
Eleven (11) actions (in total 247 minutes) once per 3 months, during operation,
Two (2) actions (in total 130 minutes) once per 6 months, during downtime for maintenance of mill,
27 actions (in total 25 hours and 46 minutes) once per year, during downtime for maintenance of mill,
Five (5) actions (in total 8 hours) once per 3 years, during downtime for maintenance of mill,
Five (5) actions (in total 9 hours) once per 5 years, during downtime for maintenance of mill,
SIMINE Mill Gearless Drive Recommended Maintenance Schedule
Page 23 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Minimum work for maintenance of Gearless Drive,
average of 37 hours per year,
Normal electricians and engineers are requested for scheduled
maintenance,
Siemens offers maintenance and service contracts
SIMINE Mill Gearless Drive Maintenance, Service
Page 24 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Content
Experience & References (5 minutes)
Maintenance, Service (2 minutes)
Major Problems and their Solutions (25 minutes)Cadia, Repairs, Lessons learned Chilean plant, Rotor failure
Performance: Downtime; Availability (10 minutes)
SIMINE Mill Gearless Drive Performance
Page 25 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Cadia; AustraliaGearless Drive 20 000 kW for a 40 ft. SAG-Mill
Commissioning in May 1998
Elastic DeflectionsDuring Startup
Vibrations during operation
Observed Phenomena at the Motor of Cadia
Page 26 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
f [Hz]0
10
20
0 1 2 3 4 5 6 7 8 9 10 11 12
P [MW]
OperatingrangeOperatingOperatingranrangege
7 Hz = 9.5 rpm
Resonance frequency of the stator system
Cadia: Investigation
Rated speed: 9.01 rpm
Rated frequency: 6.6 Hz
Maximum speed: 10.36 rpm
Max. frequency: 7.6 Hz
Page 27 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
The resonance already appeared during commissioning in July 1998
The problems occurred at cold condition of the motor.
Reaching the operation temperature of the Ring motor the vibrations disappeared
and the Gearless Drive was operated using the complete speed range
Cadia:Resonance of the stator system
Page 28 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Pedestals with hydraulic jacks were installed at the stator bottom to increase stiffness of stator.
During commissioning stage Siemens provided preliminary measures to enable the operation of Gearless Drive and SAG-Mill also at cold condition.
Cadia: Resonance of the stator system; PRELIMINARY MEASURES
Page 29 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
The preliminary measures were so successful that Cadia operated the SAG-Mill continuously at full throughput.
The preliminary measures allowed the operation in the complete speed range also in cold condition.
As a consequence Cadia allowed
access for investigation only during liner change,
six months after start of commercial operation.
Cadia: Resonance of the stator system; PRELIMINARY MEASURES
Page 30 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
During liner change was performed the deflection measurement taken on the motor of Cadia with photogrammetric system
Cadia: Resonance of the stator system; INVESTIGATION
Page 31 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Foundation stiffness
Mill stiffness
Mill modeledas rigid body on springs
Stator modeledwith beam elements
Air gapelements
Cadia: Lessons learnedImproved FE model, considering non-linear air gap behavior
Non-linear air gap force vs. deflection
relation
Special airgap elementsallow a direct input ofexcitation current
Reaction forces are calculated on deformed structure
Dynamic reaction of structure is calculatedwith direct time integration
Page 32 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Cadia: Lessons learnedImproved FE model, considering non-linear air gap behavior
3rd mode shape: Ovalization
Page 33 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Cadia: Lessons learnedImproved FE model, considering non-linear air gap behavior
4th mode shape: Twisting
Page 34 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Modified form of the stator
Additional stiffener built on the stator
Cadia: RepairsModification of stator
Page 35 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
The installation of the stiffener was performed during a
downtime of 7 days
parallel to a liner change of five days.
Cadia: Resonance of the stator system; End of 1999 the stiffener was installed on the stator
Page 36 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Cadia: Resonance of the stator system; Final solution: Stator with stiffener
Since installation of the stiffener, end of 1999, the Ring motor of Cadia does not show any vibrations any more.
Page 37 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Lamination core
Mill flange
Rotor flange
Rotor poles
Rotor support
Cadia: Rotor Pole Segments Cracks at support ribs
Page 38 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Cadia: Rotor Pole Segments Cracks at support ribs
Change of airgap at several spots was detected in 2003.
The problem was investigated during liner change.
Engineering analysis and repair concept was developed by Siemens together with Cadia and EAnD.
Cadia published a paper on the SAG-conference 2006 in Vancouver.Please find more details there.
Page 39 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Cadia: Rotor Pole Segments Repair
Repair was performed during a scheduled downtime of 15 days in June 2005 in parallel to a liner change, which normally needs four days.
Page 40 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Cadia Gearless Drive AVAILABILITY
Start-up July 1998 to 2003 mechanical & electrical: 98.5 %
From 2003 to 2005 electrical: 98.5 %
2005 Repair of rotor electrical: 95.5 %
2005 to date electrical: higher than 99 %Ring motor: 100 %
Page 41 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Cadia: Cracks of welding beams at rotor supportDesign Change
Lamination
Pressure plate
Flange plate
Divided ribWeld
Pressure bolt
Page 42 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Tensile load
Stress concentration
Magnetic pull
Stator core
Magnetic pull
Tensile load
Cadia: Cracks of welding beams at rotor supportDesign Change
Page 43 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
The magnetic pull tries to bend the lamination and the rib welded on to it.
Through this a tensile load arises in the lower edge of the rib.
There is no stress concentration since the rib cross section is undisturbed.
Magnetic pull
Tensile load
Stator core
Cadia: Cracks of welding beams at rotor supportDesign Change
Page 44 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Cadia: Cracks of welding beams at rotor supportDesign Change
Design Change was implemented 2005 and is in operation in all Siemens Gearless Drives since then.
Page 45 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
The 38’ SAG-Mill is in operation since September 2003
During the weekend of August 31, 2008 the SAG-Mill stopped several times and was restarted. Finally the air gap supervision tripped the motor and did not permit to restart it again on September 1, at 4:48 a.m.
Air gap and rotor were revised and there was found a crack of a weld of the rotor segment support (Picture next page)
Specialists from Siemens Germany arrived on September 3 at site and investigated the motor. They found another crack at the same segment and another segment with cracks.
They started the repair on September 4 and the mill restarted on September 8, 2008 at 9:10 a.m.
38’ Gearless Mill Drive, ChileCracked Weld at rotor support
Page 46 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Chilean Plant Cracked Weld at rotor support
Page 47 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
The mechanical stress is caused by three effects
Constant stress by constant magnetic force, (does not cause fatigue)
Fatigue is caused by variable stress
Variable stress by gravity,
Variable stress by changing magnetic force over the circumference, due to air gap deformation
Chilean Plant Origin: Fatigue by mechanical stress
Page 48 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Normal air gap deformation during operation
Small air gaphigher force
Large air gapsmaller force
Chilean Plant Variable Stress around the circumference
Page 49 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Chilean Plant Provisional Repair of Rotor Segment
Page 50 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Chilean Plant Provisional Repair of Rotor Segment
Page 51 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Chilean Plant, Provisional Repair of Rotor Segment
Page 52 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Siemens investigated the possibility of similar damages in other Ring Motors and informed in September 2008 three other users to inspect the rotors:
Other Chilean PlantInspection was performed during mill maintenance in February 2009: no findings
Australian plantInspections were performed during plant maintenance in November 2008 and February 2009:cracks were found and provisionally repaired; 2 additional days of downtime;
Indonesian plant Inspection was performed during plant maintenance in April 2009 cracks were found and provisionally repaired; 12 additional hours of downtime;
Defect of rotor segments; Consequences for other users
Page 53 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
The final repair of the rotor segments were planned from June 30, 2009 to July 14, 2009, parallel to a mill maintenance (liner change) .
After replacing 4 segments, turning of motor for positioning wasinterrupted by earth fault.
There were found foreign objects in the air gap, which had damaged stator windings and rotor coils.
Repair of windings and coils was finished August 10, 2009without completion of rotor segments.
A failure of the feeding switchgear delayed the restart of production for another two days.
Caused Downtime: 43 days minus 4 days for mill maintenance
Chilean Plant Final Repair of Rotor Segment
Page 54 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Content
Experience & References (5 minutes)
Maintenance, Service (2 minutes)
Major Problems and their Solutions (25 minutes)Cadia, Repairs, Lessons learned Chilean Plant, Rotor failure
Performance: Downtime; Availability (10 minutes)
SIMINE Mill Gearless Drive Performance
Page 55 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Major downtimes for repair:
Cadia, Vibrations,
Cadia, defect at the rotor segments,
Chilean Plant, defect at the rotor segments,
Australian plant, defect at the rotor segments
Indonesian plant, defect at the rotor segments
SIMINE Mill Gearless Drive Downtime, Availability
Page 56 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Cadia; Vibrations
Downtime for repair: 7 days minus 5 days for liner change
SIMINE Mill Gearless Drive Downtime, Availability
Cadia; Defect of rotor segments
During 2003 Cracks of welds at rotor support were found and provisionally repaired. Downtime: 5 days for investigation and repair
minus 4 days for liner change.
In 2005 the final repair was performed with a downtime of 15 days.
Downtime for repair: 15 days minus 4 days for liner change
Page 57 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Chilean plant; Defect of rotor segments
September 1, 2008 the air gap supervision of the 38’ Ring motor tripped the mill. Cracks were detected and provisionally repaired. September 8, 2008 the 38’ mill was restarted. 9 days of unscheduled downtime
First part of final repair in 2009 including repair of occurred damages: Downtime: 43 days minus 4 days for mill maintenance
Scheduled completion of final repair in 2010: Downtime: 15 days minus 4 days for liner change
SIMINE Mill Gearless Drive Downtime, Availability
Page 58 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Major downtimes for repair:
Cadia, Vibrations: 2 days
Cadia, defect at the rotor segments: provisional repair: 1 day….
final repair: 11 days
Chilean plant, defect at the rotor segments: 2008: 9 days First part of repair in including repair of damages 2009: 39 days
final repair, scheduled 2010: 11 days
Australian plant, defect at the rotor segments: 2009: 2 daysfinal repair, scheduled 2010: 14 days
Indonesian plant, defect at rotor segments: 2009: 0.5 daysfinal repair, date to be defined: 10 days
Total sum 99.5 days
SIMINE Mill Gearless Drive Downtime, Availability
Page 59 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Total Operation hours
SIMINE Mill GD in Mining:
Machine days105,000
With major downtimes of in total 99.5 machine days
until September 2009
SIMINE Mill Gearless Drive Performance
Page 60 October 2009 I IS MT MIKurt TischlerConfidential / Copyright © Siemens AG 2009
Thank you for your attention!
Contact:
Kurt TischlerSiemens AGMetals TechnologiesMining IndustryW-v-Siemens-Str. 5091052 Erlangen / GermanyPhone: +49 (9131) 7-42420Mail: [email protected]
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