optimization of preventive maintenance and operator ... · make a route for only one component or...
TRANSCRIPT
![Page 1: Optimization of Preventive Maintenance and Operator ... · Make a route for only one component or equipment type, for example “pumps routes” or “valve routes” Because inspector](https://reader031.vdocuments.site/reader031/viewer/2022013020/5e90da670dc8794b1207b046/html5/thumbnails/1.jpg)
Results Oriented
Reliability and Maintenance
Consulting and Training
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Optimization of Preventive Maintenance and Operator Essential
Care
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Rate your Current Operator Essential Care & Preventive Maintenance System
• On a loose sheet of paper please write a number between 1 and 10. • Using your personal definition of what Operator Essential Care &
preventive maintenance (PM) is in your plant. Please rate how well you currently do OBR & PM at the plant.
• 1 – Non existent• 2• 3• 4• 5 – Average in industry• 6• 7• 8• 9• 10 – Not cost effective to improve
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DO
REACTREPAIR
RETURNREPEAT
TECHNICAL DATABASE &
STORES
PREVENTION & CONDITION
MONITORING
PRODUCTIONPLAN
MARKET
CONTINUOUS IMPROVEMENT
RECORD
MAINTENANCEPLANNING AND
SCHEDULING
Priorities / Backlog
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Exercise!
How is Preventive Maintenance Defined?
How is Operator Essential Care Defined?
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“All actions to prevent a failure or
detect a failure early”
Preventive Maintenance & Operator Essential Care Definition?
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When the equipment condition reaches an unacceptable level
When the failure has developedto the point that the equipment is unable
to operate
The failure is detected and reportedFAILURE
BREAK DOWN
Failure & Break Down
SOURCEEvent that initiateFailure developing
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IDCON Definition - Preventive Maintenance / Essential Care and Condition Monitoring ( PM/ECCM )
Essential CarePrevents Failures
Condition MonitoringDetects Failures
•Lubrication•Alignment•Balancing•Detailed Cleaning•Operating Practices•Installation Practices•Filtration •Adjustments•Fixed Time Maintenance
LookListenFeelSmell
MeasuringPressureFlowCurrent, VoltageDistanceVibration TemperatureDecibels
UsingInfrared CamerasVibration SensorsShock Pulse MeasurementUltrasonic Thickness TestUltrasonic Listening (leaks)Oil AnalysisGauges, etc
ObjectiveProvides a comparable reading
SubjectiveProvides no reading
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Do We Know Exactly where We are Going?
TIME
OEC/ PM
CURRENT
The Vision
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Communicate a Vision to the Plant
• If want people to buy into the concept of OEC or PM, you must “paint a picture” of the future. What will this system look like when we are done.
• An Example
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What Exactly is it We Want Operations To Do?
• You need to decide for your plant
Typically
1. Inspections of running equipment, mostly mechanical inspections
2. Detailed cleaning of equipment & housekeeping3. Operate equipment with reliability in mind4. Minor maintenance tasks5. Coordinate Production Schedule & Maintenance Schedule6. Joint Root Cause Elimination
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What’s more important?
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Do you see a problem?
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Preventive Maintenance Common PM (including OEC) Before Improvement
Process Control
Electrical
Lubrication
Instrumentation
Operations
Mech.Vibration Analysis
InfraredThermogr.
Oil Testing
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Preventive Maintenance Painting the Picture of Finished Product
Process ControlElectricalLubrication
InstrumentationOperations Mechanical
Vibration Analysis
InfraredThermogr.
Oil Testing
•Many PM’s moved from off-line to on-the-run•Coordinated PM process between skills reduces PM process size•Essential Care reduces amount corrective work , not necessarily Preventive
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Operator Essential Care, Preventive Maintenance, Root Cause, Planning and Scheduling, Spare Parts Management
• Making any of the above an isolated effort is a mistake.• Focus on one temporarily can work• They have to be integrated
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Results Oriented
Reliability and Maintenance
Consulting and Training
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Essential Care - Prevent
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DO
REACTREPAIR
RETURNREPEAT
TECHNICAL DATABASE &
STORES
PREVENTION & CONDITION
MONITORING
PRODUCTIONPLAN
MARKET
CONTINUOUS IMPROVEMENT
RECORD
MAINTENANCEPLANNING AND
SCHEDULING
Priorities / Backlog
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Motor Life in Relation to Cleanliness
0.5
3.2
8
20
02468
101214161820
Heavy Cov / 50%airintakeLight Cov /50%airintakeClean / 50% airintake
Clean 100% airintake
Years
20 HP, 1800 rpm, frame class F (155ºF)
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185 °F
Dirty Motor
Rule of Thumb:An 18 °F Increase In TemperatureReduces Motor Life by 50%
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135 °F
Cleaner Motor
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Make a Visible Change Early in the Project
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Make a Visible Change Early in the Project
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Operate Equipment with Reliability in Mind
The current load is 4-7 times the full operating load at starting the motor.
Operators should therefore not try to start Motors several times quickly together.
It will burn the motor
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•Bearings Brinelling•Corrosion of moving parts•Aged Lubricant• Seals dry up / sag
Operating Procedures - Parallel Systems
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Bearing Life Reduction – An Example
0
20
40
60
80
100
120
1 2 3 4 5
Mills / inch
% Bearing life
Roller bearings
Maintenance Technology Feb. 2000
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Poorly aligned Probably Well Aligned
Other Signs:• Hot bearings• Hot Couplings• Vibrating Equipment
Signs of Poor Alignment
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The Micrometer “µm”“Micron” = Micrometer = 0.000001m1 Micron = 0.000 039 inch
Grain of salt 100 µm Thickness of paper 75 µm Human hair 70 µm Naked eye can see 40 µm White blood cells 25 µm Red blood cells 8 µm Bacteria (cocci) 2 µm
Human Hair 75 µm particles 10 µm
Measurement of Particle Size
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Bearing Life & Filtration
0
2
4
6
8
10
12
14
3 6 9 12 15 18 21 24 27 31 33 36 39
Filter rating [µm], ß=200
Bea
ring
life
in m
illio
ns o
f cyc
les
Reference: Dr. P.B Macphereson, U.K
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Maintainability
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Design for Reliability
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Design for Maintainability
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Design For Maintainability
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Motor Shelf
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Results Oriented
Reliability and Maintenance
Consulting and Training
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Condition Monitoring –Finding Failures
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DO
REACTREPAIR
RETURNREPEAT
TECHNICAL DATABASE &
STORES
PREVENTION & CONDITION
MONITORING
PRODUCTIONPLAN
MARKET
CONTINUOUS IMPROVEMENT
RECORD
MAINTENANCEPLANNING AND
SCHEDULING
Priorities / Backlog
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How would you inspect the Zinc anodes?
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Solution?
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Exercise 8-B
Heat ExchangerOil Out
Oil In
Water in Water out
Temp. gauge
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Heat Exchanger Valve
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Expensive Ratio 200:1Cheap Ratio 3:1
D=20 in
L= 400 in
RATIO = L/D = 400/20 = 20:1
Infrared Temperature “Guns”
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Possible Inspection Tools
Vibration Pen
Inspection Mirrors
Stroboscope
IR Gun
Industrial Stethoscope
Flashlight
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Flashlight
285 Lumens, size of a Marker
218 Lumens / 4D Batteries about a foot long
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Temperature Crayons
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Infrared Camera
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Leaking Steam System – Relief Valve
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Wet Insulation –Saturated with Water Due to Leak
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Results Oriented
Reliability and Maintenance
Consulting and Training
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The Basics of Reliability and Document tasks
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Paper Inspection Route Example
175
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CMS (100 Available)
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Fahrenheit
Handheld Example
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Common Mistakes – (A Few Examples)
Make a route for only one component or equipment type, for example “pumps routes” or “valve routes” Because inspector will have to walk around the plant 30-50 times
to reach all equipment
No use of standard job plans for inspections Makes maintenance of inspection lists very cumbersome if a new
inspection tool or new technique is established
Separate routes for different inspection intervals Often a daily, a weekly, a monthly, a semi annually route for each
trade make scheduling cumbersome and maintenance of routes very maintenance intensive.
Set up of too many measuring points that are collected but not analyzed
We don’t fix what we find
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Work Order PM
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What is the Final Documentation Product of OEC and PM
Usually• Inspection Routes for on-the-run PM/OEC
– Usually less than 5 minutes per equipment number
• Work orders for off line PM/OEC– Often longer jobs 30 min – 16 hrs
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Reliability Basics
• Maintenance Methods Available
• Life of Components
• Failure Developing Period (FDP)
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Maintenance Methods – Existing Equipment
• OTB – Operate To Break-Down– Often Too Expensive
• FTM - Fixed Time Maintenance– Don’t Know Life Most of the Time
• CBM – Condition Based Maintenance– 70-85% Will Therefore Need CBM
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Random or not?
• It is unnecessary to know which of the traditional six life expectancy. You need to estimate if the failure IS Random or NOT. All failures are somewhat random and 5 – 11% somewhat predictable (C & possibly A & B).
2%
4%
5%
7%
14%
68%Picture Courtesy: www.weibull.com
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L10 L90
Bearing life under the same operating conditions, can vary from 1 to 25 years
Component Life
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Car tires life under the same operating conditions, may vary from 35,000 to 45,000 miles
(6000-6500 mil)
35 K 45 K
Back
Component Life
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Cha
nge
in C
ondi
tion
Bre
ak D
own
FDP
A belt will show signs of deterioration before breaking down
Failure Developing Period
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When the equipment condition reaches an unacceptable level
When the failure has developedto the point that the equipment is unable
to operate
The failure is detected and reportedFAILURE
BREAK DOWN
Failure/ Break Down
SOURCEEvent that initiateFailure developing
Source: källa till feletBreak down: Haveri
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Bre
ak D
own
A light bulb will break instantaneously without any
signs of deterioration
Failure Developing Period
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1. Prevent failures2. Most cost effective maintenance method3. Implement the most cost effective method
Selecting Maintenance Method
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•Detailed Cleaning•Lubrication•Alignment•Adjustment•Operating Procedures•Filtration•Balancing•Installation Procedures
Preventing Problems
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Maintenance Methods – Existing Equipment
• OTB – Operate To Break-Down– Often Too Expensive
• FTM - Fixed Time Maintenance– Don’t Know Life Most of the Time
• CBM – Condition Based Maintenance– 70-85% Will Therefore Need CBM
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What will happen if the function Break down?1. Environmental damage or personal injury2. High cost (lost production or damages)3. Preserve value (Life)
• Obvious• P & ID • Ask operator
99%
ANSWER BY:
What is the Function?
Selecting Maintenance Method
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ESSENTIAL CARE (EC)lubricationalignmentbalancingdetailed cleaningoperating proceduresfiltration CBM
Inspection lists on component level1. Running objective2. Running subjective3. Shutdown objective4. Shutdown subjective
For Existing Equipment
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Decide What, Who, and When
• Decide what inspections/ PM to Do
• Decide who Should do the tasks
• How often should the task be done?
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How does this component work?
How can this component fail?
How can I predict the failure?
Alternative to RCM (Reliability Centered Maintenance)
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Example: Belt
How does it work?
How does it fail?
Check:Slippage/ oil, waterBelt tightnessAlignment of BeltSheave WearNoise
E!
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Motor InspectionOn-The-Run• Cleanliness (fins, plugged airflows, etc)• Fan with strobe• Temperatures with (IR Temperature - Max? 170F (75C)• Vibration (feel or with Pen – Alarm 0.25 in/sec 6.35 mm/sec?)
• Hold down bolts• Base• Condition of Junction Box and wires• Noise• Load (Current Reading)
ShutdownWinding test
CMS 100 R
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Exercise 5-B
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Exercise 5-B
• Temperatures• Bolts and Fasteners• Noise and Vibration & cavitation• Oil - Level and Condition• Leaks • Pressures• Cleaning • Breather• Piping to and from Pump
• CMS 127R
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Do they know how?Is it practical?
N
Can they be trainedin < X min?
ImplementTask
Y
N
Go to next groupYN
Y
1. Operator2. Area Maintenance3. In house maintenance expert4. Outside expert
GROUPS
Who
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Motor Temperature
Belt and Coupling Condition with Stroboscope
Weep Hole Regulator
Typical Operator Inspections
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Examples of Typical Maintenance Inspections
Places Impractical for Operators to Get To
Complex Systems Vibration Analysis
Components that Require Experience Infrared Camera
Typical Maintenance Inspections
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Ref: CMS127R
Ref: CMS106R
Ref: CMS100R
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Hydraulic Cylinder
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MAINTENANCE PROCEDURE
FAILURE RATE
DIR. MAINT. COST REPAIR TIME +
MATERIAL = COST
COST / YEAR
DOWNTIME COST / YEAR DAMAGES MAINTENANCE COST/YEAR
OTB
FTM
CBM
0.2
1
0.2
16h * $40 = $640Parts 3,000 $728
10h *$40 = $400Parts 3,000
10h *$40 = $400Parts 3,000
3,400
680
0.2*$4,000*10 = $8,000
0
0
1,000*0.2=$200
0
0
728+8,000+200=$8,928
$3,400
$680
Consequence of Break Down Analysis
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Summary of Documentation Setup
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Most OrganizationsKNOW
What to do
Best OrganizationsDo it.
Results Oriented Maintenance
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Example 1- Kiln bricksOperate To Breakdown - OTB $500,000If responded to Inspection $60,000
Lost opportunity – actual example
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Accounting