Contenu connexe Similaire à Best Practices in Maintenance and Reliability (20) Plus de Ricky Smith CMRP, CMRT (20) Best Practices in Maintenance and Reliability2. Copyright 2010 GPAllied©
Route Wav eform
25-Jun-03 09:05:36
RMS = .4763
PK(+/-) = 1.85/1.60
CRESTF= 3.88
0 40 80 120 160 200 240 280 320
-10
-5
0
5
10
Time in mSecs
AccelerationinG-s
CF ALARM
CF ALARM
PK ALARM
PK ALARM
SHM - 150 Hp Vertical Turbine Pump
150 Hp VT-M1V Motor #1 Bearing - Vert
Route Spectrum
25-Jun-03 09:05:36
OVERALL= .3255 V-DG
RMS = .4796
LOAD = 100.0
RPM = 1800. (30.00 Hz)
0 1000 2000 3000 4000 5000
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Frequency in Hz
RMSAccelerationinG-s
75.3°F
118.9°F
80
90
100
110
119.1°F
74.5°F
156.9°F
80
100
120
140
153.1°F
Vibration Analysis and Infrared Thermography
It isn’t what you know that will kill you, It is
what you don’t know that will
3. Copyright 2010 GPAllied©
“A Proactive Reliability Process is a supply
chain. If a step in the process is skipped or
performed at a substandard level, the process
creates defects known as failures. The output
of a healthy reliability process is optimal
asset reliability at optimal cost.”
Source: Ron Thomas, Reliability Director, Dofasco Steel
4. Copyright 2010 GPAllied©
Nowlan and Heap Study stated…
“…Without a precise definition of what
condition represents a failure, there is no
way to assess its consequences or to define
the physical evidence for which to inspect.
The term failure must, in fact, be given a far
more explicit definition than “an inability to
function” in order to clarify the basis of
Reliability-Centered Maintenance.”
5. Copyright 2010 GPAllied©
Nowlan and Heap Study further stated…
“…A failure is an unsatisfactory condition. In
other words, a failure is an identifiable
deviation from the original condition which is
unsatisfactory to a particular user.”
6. Copyright 2010 GPAllied©
What is a Failure?
• “A functional failure is the inability of an item
(or the equipment containing it) to meet a
specified performance standard and is
usually identified by an operator”.
7. Copyright 2010 GPAllied©
What is a Failure?
• “A potential failure is an identifiable physical
condition which indicates a functional failure
is imminent and is usually identified by a
Maintenance Technician using predictive or
quantitative preventive maintenance”
15. Copyright 2010 GPAllied©
Self Induced Failures
• 70-80 % of equipment
failures are Self-Induced
– Reliability
• Putting hydraulic fluid into a
reservoir without filtering it
• Welding on equipment without
grounding properly
• Running Equipment to Failure when
it is not part of your maintenance
strategy
• Aligning couplings without using a
laser
• Improperly lubricating electric motors
16. Copyright 2010 GPAllied©
Common Problems
• Equipment continuing to fail without a known
root cause
• PM is performed on time but equipment
continues to break down
• Age of equipment seems to be problem
• There is never enough parts in the
warehouse
• Parts are not ordered fast enough
• Maintenance personnel blamed for standing
around
17. Copyright 2010 GPAllied©
Common Problems, cont’d
• Management blames Maintenance for the
company not meeting it’s business goals
– Reliability is always the problem
• The Maintenance process is built around
reacting to equipment problems
• Equipment history does not seem complete
and hard to find data
– Planner/Schedulers performing clerk duty
• Production/Operations operates inefficiently
but no one seems to be aware of the problem
18. Copyright 2010 GPAllied©
What is Reliability?
“The probability that a system will perform
satisfactorily for a given period of time under
stated conditions.”
•Motor •Pump •Valve •Cylinder •79%
R1 = 95% R2 = 95% R3 = 93% R4 = 94%
19. Copyright 2010 GPAllied©
Reliability Definitions
• Function: What the owner or user of a physical asset
wants it to do
– Example: Pump: To transfer 300 Gallons of product at 60 PSI -
24 hours a day / 7 Days a week from point A to point B
• Functional Failure: A state in which the physical asset
or system is unable to perform a specific function to a
level of performance that is acceptable by its owner or
user
– Example: Pump: To transfer less than 300 Gallons (250 Gallons) of a
product at 60 PSI 24 hours a day / 7 Days a week (Functional Failure)
•Source: RCM !! – John Moubray
20. Copyright 2010 GPAllied©
Source: John Moubray, Nowlan & Heap
Time Time
Age Related = 11% Random = 89%
Bathtub
Pattern A = 4%
Wear Out
Pattern B = 2%
Fatigue
Pattern C = 5%
Initial Break-in period
Pattern D = 7%
Random
Pattern E = 14%
Infant Mortality
Pattern F = 68%
Failure Patterns
21. Copyright 2010 GPAllied©
Failure Patterns - 1990’s Data
Source: Tim Allen, SUBMEPP
Infant Mortality
Wear Out
2% 10%
68% 6%
Why?
Into what category did
the rest of the failures fall?
23. Copyright 2010 GPAllied©
NOTIFICATIO
N
FIX
COMPLETE
INFORMATION PARTS
TOOLS
ENGINEERING
FILE CABINET
TOOL BOX
“JOE”
SUPERVISOR
PRODUCTION
WAREHOUSE
VENDOR
FABRICATE
IDENTIFY
TEST
CLEAN
DISASSEMBLE
MEASURE
PLAN
GENERAL PURPOSE
SPECIAL PURPOSE
PERSONAL
TOOL CRIB
CONTRACTOR
EVENT
TIME
MECHANIC
ASSESS
JOB
Traditional Maintenance
26. Copyright 2010 GPAllied©
Wikipedia Defines…
• FRACAS is a system, sometimes carried out
using software, that provides a process for
reporting, classifying, and analyzing failures,
and planning corrective actions in response
to those failures
28. Copyright 2010 GPAllied©
What is it you want to know about Failures?
• What equipment is giving me the biggest
losses and why?
• What component is failing the most and
why?
• Where should you focus your RCA efforts?
• Frequency of a failure mode – decrease?
29. Copyright 2010 GPAllied©
Source: John Moubray, Nowlan & Heap
Time Time
Age Related = 11% Random = 89%
Bathtub
Pattern A = 4%
Wear Out
Pattern B = 2%
Fatigue
Pattern C = 5%
Initial Break-in period
Pattern D = 7%
Random
Pattern E = 14%
Infant Mortality
Pattern F = 68%
What is your most Dominant Failure Pattern?
30. Copyright 2010 GPAllied©
Key Points to Know!
• If you are managing to “P” on the PF Curve you
get rid of most of your catastrophic or total
function failure
• If you are managing to “I”, your are managing
the causes of failures and thus eliminate
failures and optimize reliability
• The best person to identify the
“Defect or Problem” and
“Cause” of the failure
is your Predictive
Maintenance Technician
or Reliability Engineer
31. Copyright 2010 GPAllied©
“The significant problems we face cannot be
solved with the same level of thinking we
were at when we created them.”
- Albert Einstein
32. Copyright 2010 GPAllied©
Task/Functions Facility
Owner
MTF
Commander
Maint.
Manager
Reliability
Engineer
Maint.
Supervisors
Contract
Officer
Maint.
Planner
Inputting Work
Order Data -
CMMS/EAM
I R C R A C
Reviewing and
taking action
on KPIs
I I R I C A C
QA of Data
Input
I A C I C
Failure Reports
Findings
I I A R C C I
Maintenance
Strategy
Adjustments
I A R C C C
Responsibility “the Doer”
Accountable “the Buck stops here
Consulted “in the Loop”
Informed “kept in the picture”
33. Copyright 2010 GPAllied©
Best Maintenance Practices
• 90% of all work is planned
• 85 – 90% Scheduled Compliance is met
• 100% of a maintenance personnel’s time is
covered by a work order
• 100% of all maintenance personnel’s time is
scheduled
• 90% of scheduled work is planned
• PMs are written with task steps,
specifications, tools, etc
34. Copyright 2010 GPAllied©
Best Maintenance Practices, cont’d
• Effective work procedures are written and
followed
• The 10% Rule of Preventive Maintenance is
applied and managed
• Store efficiency is more than 98%
• Less than 1 hour for Mean Time To Order of
parts
36. Copyright 2010 GPAllied©
Best Reliability Practices
• MTBF is High
• MTTR is monitored and measured
• Reliability Engineering is focused 100% on
the Reliability of Assets
• All assets are prioritized based on risk to the
business and equipment condition
• FRACAS is implemented and used to make
decisions on reliability improvements
37. Copyright 2010 GPAllied©
Best Reliability Practices, cont’d
• Root Cause Analysis (RCA) is a common
practice
– Applied to any failure that is costly or repeats
itself
• Reliability is owned by production and
maintenance and is apparent
• Operator PMs are utilized effectively
• Equipment Damage by Operators is minimal
• Reliability Centered Maintenance (RCM) is
applied to critical assets
38. Copyright 2010 GPAllied©
Best Reliability Practices, cont’d
• Utilization of Assets is above 98%
• Time based PMs are less than 20%
• Key data is collected and disseminated to
determine the health of an asset
41. Copyright 2010 GPAllied©
Maintenance
• MTBF
• Production Output
• Maintenance Cost
Scheduled
Compliance
PM
Compliance
Lagging
Leading
Percent of
Planned
Work
Leading and Lagging Indicators
42. Copyright 2010 GPAllied©
Where to Start with Maintenance and
Reliability Metrics
• MTBF
• MTTR
• MTBR
• PM Compliance
• % of Planned Work
• Scheduled Compliance
• # of breaks to Schedule by Maintenance and
Operations
43. Copyright 2010 GPAllied©
Where to Start with Maintenance and
Reliability Metrics, cont’d
• PM Labor Hours vs. EM Labor Hours
• Maintenance Cost per unit produced
• Stores Efficiency
• Vendor Efficiency
• Equipment Damage Cost Per Unit
44. Copyright 2010 GPAllied©
Steps to Success
• Map your processes and identify leading and
lagging KPIs in them
• Be sure and have clear definitions of your
KPIs
• Assign RACI to metrics
– Responsible
– Accountable
– Consulted
– Informed
• Develop scorecards
from lowest level to highest (4-6 KPIs)
46. Copyright 2010 GPAllied©
Causes of Variation
• Lack of an effective PM Program
• Lack of a repeatable repairs with
specifications
• Lubrication issues, lack of lubrication,
contamination, etc.
• Operator Error
• Use of wrong tool to make repair
– Bearing heater
• Use of wrong specification
– Torque values
50. Copyright 2010 GPAllied©
• Repeatable process
• Capture knowledge
• Train new employees
• Reduce self induced failures
Why are Work Procedures Important?
51. Copyright 2010 GPAllied©
Steps to Reliability
1. Ensure your Equipment Hierarchy is
effective
2. Prioritize assets according to consequence
and risk
3. Identify the right maintenance strategy
4. Optimize Planning and Scheduling
5. Ensure Failure Data is captured and used
for FRACAS
– Failure Reporting,
Analysis, Corrective
Action System