how condition monitoring supports precision maintenance
TRANSCRIPT
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1 www.lifetime-reliability.com
Condition Monitoring that Supports Precision Maintenance
SIRFRt CM & Lube Forum 2010 Conference
Mike Sondalini Lifetime Reliability Solutions
www.lifetime-reliability.com
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Precision Maintenance of Machinery is …
1. Accurate Fits and Tolerance at Operating Temperature
2. Impeccably Clean, Contaminant-Free Lubricant Life-long
3. Distortion-Free Equipment for its Entire Lifetime
4. Forces and Loads into Rigid Mounts and Supports
5. Laser Accurate Alignment of Shafts at Operating Temperature
6. High Quality Balanced Rotating Parts
7. Total Machine Vibration Low
8. Correct Torques and Tensions in all Components
9. Correct Tools in Precise Condition to do the Task to Standard
10. Only In-specification Parts
11. Failure Cause Removal during Maintenance
12. Proof Test for Precision Work and Equipment
13. A quality assurance system to make all the above happen
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Typical Standards for a Precision Maintenance Program
1. Accurate Fits and Tolerance – ISO Shaft/Hole Tolerance Tables, International Tolerance Grade
2. Clean, Contaminant-Free Lubricant – ISO 4406, ISO 11500
3. Distortion-Free Equipment – Shaft Alignment Handbook – Piotrowski
4. Shafts, bearings, couplings Running True to Centre – Shaft Alignment Handbook
5. Forces and Loads into Supports – Shaft Alignment Handbook
6. Accurate Alignment of Shafts – Shaft Alignment Handbook
7. High Quality Balancing of Rotating Parts – ISO 1940
8. Machine Vibration – ISO 10816
9. Correct Torques and Tensions – ISO/ASME Bolt, Stud and Nut Standards
10.Correct Tools in Correct Condition – ‘As-New Specification’
11.Only In-specification Parts – OEM Specifications, Metallurgical Specifications
12.Failure Cause Removal During Maintenance – Creative Disassembly; ‘5 Why’
13.Proof Test for Precision Work and Equipment – Measurement, Start-up Condition Monitor
14.A system to use the standards successfully – 3T Accuracy Controlled Procedures
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Vibration:
Balancing:
Alignment: Fastener Torque:
Deformation:
Lubricant Cleanliness:
Reaching High Reliability is Easy…
Fits and Tolerance:
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The answers to these questions let you
check your machinery’s true condition.
First find out...
How round does it need to be? How flat does it need to be? How straight does it need to be? How clean does it need to be? How tight does it need to be? How right does it need to be?
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Form Tolerance Manufacturers Use
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ISO Hole Tolerances - minimum hole size as basic diameter
- denoted by Capital letter (say, H)
40 H8
Basic Size
Fundamental Deviation
IT grade
Tolerance Zone
ϕ40 Shaft Hole
H
8 IT grade
Fundamental
Deviation
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Hole Fundamental Deviation
40 H8 H8
40.039
40.000
Fundamental
Deviation
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ISO Shaft Tolerances
- minimum shaft size as basic diameter
- denoted by lower case letter (say, h)
40 h9
Basic size
Fundamental Deviation
IT grade
Tolerance zone Shaft ϕ40 Hole
h
9 IT grade
Fundamental
Deviation
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Shaft Fundamental Deviation
40 h9 h9
40.000
39.938
Fundamental
Deviation
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Case Study: Shaft Reliability Control Check
Condition Requirements from the
manufacturer or appropriate
engineering specifications
Thanks to CBC Bearings and Rod Bennett
for the information and example
150mm Spherical Roller Bearing Mounted
on a Shaft Tapered Sleeve
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Is the 150mm Shaft In Tolerance?
Shaft Tolerances for Bearing Adapter Sleeves
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Is the 150mm Shaft Round?
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Is the 150mm Shaft Cylindrical?
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Is the 150mm Shaft Tapered?
149.99 149.96 149.98
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Roller Bearing Flexing from Unsupported Ring
The bearing is not fully
supported along the shaft
and both the ring and taper
sleeve will flex back and
forth every time a roller
passes over the cavity
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Roller Bearing Excessive Clearance
will greatly reduce bearing life
may occur because of wrong installation
setup, improper fits at the seatings,
excessive wear (contamination)
the ideal clearance for most bearings is nil
clearance at operating conditions
may lead to scalloping at the load zone
may lead to wear of the cage in cylindrical
rollers and catastrophic failure
Internal Clearance and Bearing Life
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Impacts of Out-of-Roundness
What it should be..
1500RPM = 25
impacts/second
3000RPM = 50
impacts/second
Spalling
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Temperature and Bearing Life
20oC 20oC Inner Ring Unrestrained
Temperature Growth
ΔT
Inner Ring
100 oC*
50 oC Housing
50
11
0
70
40 oC
Steel Coefficient of Expansion = 12.5 x 10-6 / oC
Ring Diameter Temperature Rise Ring Expansion Radial Expansion
mm ΔT C degrees µm µm
70 20 17.5 8.75
70 40 35 17.5
70 60 52.5 26.25
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...what about the rest of the machine...
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How to Make Machines Highly Reliable?
Set Machine Quality Standards that deliver
reliability so that you can measure if a part’s
condition will indeed produce reliability
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Importance of Setting Condition Standards
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…DO NOT USE
STANDARDS THAT
ACTUALLY CAUSE
FAILURES
Challenge Yourself to IT5 Standard
ANSI API
ANSI pump base allowed flatness = 0.127mm/m… this standard causes soft-foot
API 610 flatness = 0.05mm/m… this standard makes you remove soft-foot
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Set Quality Standards that Create Reliability
FAILURE FOCUSED By this stage the bearing is well on the way to failure and certain downtime
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Job Plans with No Quality Control
JOB PLAN TO INSTALL CONVEYOR PULLEY PLUMMER BLOCK
1. Prepare for Job in Dirt-Free Work Area
2. Safe Isolation and Handover
3. Check Parts and Materials are Correct
4. Access Plummer Blocks and Bearings
5. Check Shaft Condition and Tolerance
6. Measure Bearing Internal Clearance
7. Measure Plummer Base Plate Accuracy
8. Locate Bearings on Shaft
9. Mount Bearings on Shaft
10. Position Plummer Blocks and Place Pulley
11. Complete Plummer Block and Seals Assembly
12. Align Plummer Blocks
13. Lubricate Bearing and Seals
14. Align Plummer Blocks and Bolt Down
15. Commission and Test
16. Clean-up and Hand Back
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Develop Job Plans with Measurable Quality Specifications
JOB PLAN TO INSTALL CONVEYOR PULLEY PLUMMER BLOCK
1. Work Area Prepared to site Dirt-Free standard
2. Safe Isolation and Handover Delivered from Operator
3. Check Parts and Materials are Correct to BOM
4. Plummer Blocks and Bearings Access Installed
5. Shaft Condition and Tolerance Checked against OEM values
6. Bearing Internal Clearance Measured against OEM values
7. Plummer Base Plate Measured against OEM values
8. Bearings on Shaft Located to OEM values
9. Bearings on Shaft Mounted to OEM standards
10. Plummer Blocks and Pulley Positioned to OEM standards
11. Complete Plummer Block and Seals Assembly Positioned to OEM standards
12. Plummer Blocks Aligned to OEM standards
13. Bearing and Seals Lubricated to OEM standards
14. Plummer Blocks Aligned and Bolted Down to OEM standards
15. Commission and Test that operating specification is met
16. Clean-up and Hand Back to Site Workplace Cleanliness Standards
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Failure Detection Zone Failure Cause Elimination Zone
Condition Monitoring that Drives Reliability
Failure Monitoring (feedback control) Health Monitoring (feed forward control)
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“Chop Out The Roots of Failure”
X
X
X Get rid of the cause of
vibration! Get rid of the cause of
poor connections!
Get rid of the cause of oil
contamination!
“Chop Out
the Roots” “Chop Out
the Roots”
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Is it round, is it flat, is it straight, is it clean, is it tight, is it right?
Vibration:
Balancing:
Alignment:
Fastener Torque:
Deformation:
Lubricant Cleanliness:
Fits and Tolerance:
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Set Quality Conditions that Create Machinery Health and Cause Equipment Reliability
Health Monitoring (feed forward control)
Failure Monitoring (feedback control)
Inspect
for
Failure
Inspect
for
Failure
Inspect
for
Failure
Inspect
for
Failure
Inspect
for
Failure
Inspect
for
Failure
Inspect
for
Failure
Inspect
for
Failure
Built for
Reliability
Inspect
for
Health
Inspect
for
Health
Built for
Reliability
Inspect
for
Health
Inspect
for
Health
Inspect
for
Health
Pe
rfo
rma
nce
Built for
Reliability