Tire Safety

1
Tire Safety
2
Running to Destruction

• Its not a safe practice
• Potential for loss of control
• Potential for debris to injure personnel if tire
  ruptures
• Tires with damaged structural component create
  safety hazard

3
Structural Components

• Tire manufacturer consulted since tires have
  different designs
• Inspection of defects, such as determining depth
  of cuts, on pressurized tire can create safety
  hazard - deflate tire before inspection

4
Belts

• Impact /penetration belts between tread
  structural belts
• Exposed impact /penetration belts inspected
• Exposed structural belts removed from service
• Ply rating is nominal strength rating doesnt
  indicate number of belts
• Continental Tire considers tire with any belt
  exposed not viable

5
Sidewall

• 1 structural belt in sidewall with a
  non-structural turn up of belt in bead area
• Exposed turn up wires inspected
• Exposed sidewall structural belt wires removed
  from service

6
Radial Tire
Tread
Shoulder
Sidewall
Belts
Ply
Turn Up
Air Chamber
Bead Bundle
Chafer
7
Rims

• Damaged rims can damage tires
• Rims with minor damage scheduled for maintenance,
  cracked rims or damaged lock rings immediately
  removed from service
• Wheel driver keys not considered structural
  components
• Missing keys allow rim to slip, wear o-ring,
  cause air loss - schedule for maintenance

8
Damaged Rim
Driver Key Insert
9
Structural Components

• Many defects in tread sidewall areas can be
  repaired
• Manufacturer establishes tires repair limits
• Proper repair is essential to maintain tire
  safety
• Moving tire with structural defect to inside rear
  axle position is unsafe

10
Maintenance Training

• Develop schedules out-of-service criteria
• Equipment operators visually inspect tires during
  pre-shift inspection trained to recognize
  hazardous tire defects
• Maintenance personnel trained to safely
  properly inspect repair

11
Maintenance Training

• Society of Automotive Engineers Off Road Tire
  Conditions Removal Guidelines- Draft
• Draft available for review, comments requested
• Note - this document does not affect Agency policy

12
Defects

• Bulge area of separation packed with rubber that
  has migrated from adjoining area of separation.
• Blister localized bubble on tire surface
• Chipping flaking or tearing away small bits of
  tread rubber

13
Defects

• Chunking tearing or breaking away pieces of
  tread rubber
• Cracks splits or narrow breaks in rubber
  compounds not caused by foreign object
• Cut damage made by sharp or jagged objects

14
Typical defects

• Exposed cord belt, ply or steel chafer/bead area
  reinforcement seen
• Puncture air chamber penetrated by foreign
  object causing air loss
• Separation parting of de-bonding of any adjacent
  parts

15
10 Dos

1. Pick correct tire for the job
2. Check air pressure
3. Conduct pre-shift inspections
4. Get monthly or bimonthly professional inspections
   
5. Repair problems early

16
10 Dos

1. Rotate tires
2. Establish tracking program
3. Conduct out-of-service surveys
4. Limit weight loads
5. Care about the tires

17
10 Don'ts

1. Just put on cheapest tire
2. Let air down for smooth ride
3. Just kick tires go
4. Assume you know everything
5. Just let things go
6. Let front tires be your worst tires

18
10 Donts

1. Assume you are doing good with your tire program
2. Throw away tires without knowing why
3. Run overloaded when you could have tires that can
   carry the load more effectively
4. Tell operators to not worry about the tires, just
   run them

19
Safety References

• Manufacturers, tire industry organizations,
  machine manufactures tire safety maintenance
  information

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