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GESTION DE
MANTENIMIENTO DEEQUIPO MINERO
ING. ALBERTO CHAVARRIA
Huancayo 05 Julio 2002
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MANAGEMENT
PRODUCTION
SUPERVISION
MAINTENANCE
SUPERVISION
MACHINE OPERATORS
AND SERVICE PEOPLE
SUCCESS
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HAULING
Traffic flow
Truck staging
Haulroad maintenance
Grades and curves
Length and widthDust control
LOADING SUPPORT
DRILL AND BLAST
Techniques
Optimum loadsTruck spotting
Conditions
Dump tractors
Trap dozersMotor graders
Water wagons
Fragmentation
COST INFLUENCERS
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GESTION DE MANTENIMIENTO
ALGUNOS INDICADORES DE GESTION
9DISPONIBILIDAD
9UTILIZACION
9MTBS
9MTTR
9MR
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BENCHMARCKS
99AVAILABILITY: 88AVAILABILITY: 88 -- 92%92%
99UTILIZATION : 90 %UTILIZATION : 90 %
99MTTR: 3MTTR: 3 6 hrs.6 hrs.
99MTBS:MTBS: 6060 -- 80 hrs.80 hrs.
99MR: 0.2MR: 0.2 0.30.3 All JobsAll Jobs
0.50.5 Over haul onlyOver haul only
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Benchmarks for mining ...
9Operations payload management, delays, load
times, exchange times, production, cost
per ton, etc..
9Maintenance availability, utilization, MTTR
MTBS, MR , service accuracy, backlogsetc..
9 Application ... grade/ grade variation, rolling
resistance, haul road maintenance,
traffic flow, etc..
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AVAILABILITYAVAILABILITYAVAILABILITY
9Mechanical Availability (%) = scheduled hours - downtimescheduled hours
9 Physical Availability (%) = operating hoursoperating hours - downtime
Availability (%) = MTBS__MTBS + MTTR
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785 TRUCK AVAILABILITY
75
80
85
90
95
100
Nov Dec Jan Feb Mar Apr May Jun Jul Aug
%
PHISICAL
AVAILABILITY
MECHANICAL
AVAILABILITY
TARGET
UTILIZACION
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MINERA BARRICK MISQUICHILCA
785C FLEET AVAILABILITY
94.393.3
92
88.3
93.6 93
89.8
87.586.5
83.4
86.4787.2
76
7880
82
84
86
88
90
92
94
96
JAN FEB MAR APR MAY JUN JUL
PE
RECENT
%
Mechanical Availability Phisical Availability Target
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LOST AVAILABILITY 992 FLEET
Electric System
10%
Steering System
7%
Grease Lines
22%
PM38%
Lift Tilt Sensor
6%
Transmiss ion Syst
4%Tire
10%
Others
3%
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Utilization =
Benchmark: utilization = 90%
Operational delays that affects Utilization Percent:
Shifts : two or threeClimate factors
Blasting
Planning, parts usage, tires, etc.
collect & enter daily; analyze monthly; monitor/
trend over 12 month interval.
operating hours
available hours
UTILIZATION
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785C FLETT MINERA BARRICK MISQUICHILCA
AVAILAVILITY VS. UTILIZATION
94.393.3
92
88.3
93.6 93
89.8
87.586.5
83.4
86.4787.2
92.1
94 93.4 93.6
90.7 91
76
80
84
88
92
96
JAN FEB MAR APR MAY JUN JUL
P
ERCENT%
Mechanical Availability Phys ical Availability Utilization
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MINERA BARRICK MISQUICHILCA
AVAILABILITY VS. UTILIZATION
75
78
81
84
87
90
93
96
JAN FEB MAR APR MAY JUN JUL
PERCE
NT
%
Mechanical Availability Physical Availability
Utilization Potencial (Utilization)Potencial (Physical Availability)
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MTBS(MEAN TIME BETWWEN SERVICE)
MTBS (hours) = operating hours
number of shutdowns
shutdowns can be scheduled or unscheduled,
include all maintenance and repairs except daily lubes,
refueling & inspections,
exclude operational delays, shift changes, lunch breaks, etc., grouped repairs count as one shutdown,
monitor by fleet, machine & component/ system,
indication of machineReliability and maintenanceEffectiveness,
report monthly; monitor/ trend over 12 month interval.
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MEAN TIME BETWEEN SERVICE
MBM 994 WHEEL LOADER FLEET
0
10
20
30
40
50
60
70
80
90
HO
URS
994 WHEEL LOADER 26.8 42.7 34.8 43 53.51 58
TARGET MIN 60 60 60 60 60 60 60
TARGET MAX 80 80 80 80 80 80 80
JAN FEB MAR APR MAY JUN JUL
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(MEAN TIME TO REPAIR)
MTTR
MTTR (hours) =
Benchmark (OHTs): = 3 to 6 hours (new/ mature)
shutdown criteria are the same as rules for MTBS, all delays/ wait time are included as downtime,
monitor by fleet, machine & component/ system,
indication of machineMaintainability/ Serviceability and
maintenanceEfficiency, MTTR < 3 hours indicates patching and/or high percentage
of unscheduled repairs,
MTTR > 6 hours indicates inefficiencies and/or excessive delays,
report monthly; monitor/ trend over 12 month interval.
downtime hours
number of shutdowns
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MEAN TIME TO REPAIR
992 G WHEEL LOADER FLEETMBM
0
2
4
6
8
10
12
HOURS
992G WHEEL LOADER 6.1 10.2 2.9 7.8 6.8 7.9
TARGET MIN 3 3 3 3 3 3 3
TARGET M AX 6 6 6 6 6 6 6
JAN FEB MAR APR MAY JUN JUL
TREND LINE
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Availability %
MTBS vs. MTTR for various Availabilities
10 20 30 40 50 60 70 80 90 1000
5
10
15
20
MTBS - (hours)
MTTR
-(hours)
85%
86%
87%
88%
89%
90%91%
92%
93%
94%
95%MTTR3 - 6 hrs
MTBS
60 - 80 hrs
target operating range
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Benchmark (OHTs): = .20 to .30 (charged)
.50 (overall) charged MR includes all workorder hours,
overall MR includes workorder hours plus management, staff,
supervision & idle hours,
includes component R&I; excludes component overhauls & tires, can be good manpower budgeting tool,
indication of efficiency of workforce,
report monthly (by fleet); monitor/ trend over 12 month interval.
MR
(MAINTENANCE RATIO)
MR = maintenance (& repair) man-hoursoperating hours
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OVER LOAD
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VIMS (VITAL INFORMATION MANAGEMENT SYSTEM)
785C TRUCK
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LOAD DISTRIBUTION MD703 - MAY
12 17
65
157
237 231216
114
49
12 9
0
50
100
150
200
250
300
LESS
THAN 135
135-140 140-145 145-150 150-155 155-160 160-165 165-170 170-175 175-180 more than
180
METRIC TONS
LOADQU
ANTITY
TARGET
PAYLOAD
10% OVER
T.P.20% OVER
T.P.
NO MORE THAN
10% OF TOTAL
PAYLOADS
CERO
PAYLOAD
MBM785C TRUCK
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FIN
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