Tire Safety. Running to Destruction Its not a safe practice –Potential for loss of control...
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Transcript of Tire Safety. Running to Destruction Its not a safe practice –Potential for loss of control...
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
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
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
& doesn’t indicate number of belts
• Continental Tire considers tire with any belt exposed not “viable”
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
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
Structural Components• Many defects in tread & sidewall
areas can be repaired• Manufacturer establishes tire’s
repair limits• Proper repair is essential to
maintain tire safety • Moving tire with structural defect
to inside rear axle position is unsafe
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
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
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
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
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
10 Do’s1. 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
10 Do’s6. Rotate tires
7. Establish tracking program
8. Conduct out-of-service surveys
9. Limit weight & loads
10.Care about the tires
10 Don'ts1. 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
10 Don’ts6. Assume you are doing good
with your tire program 7. Throw away tires without
knowing why 8. Run overloaded when you could
have tires that can carry the load more effectively
9. Tell operators to not worry about the tires, just run them
Safety References• Manufacturers, tire industry
organizations, & machine manufacture’s tire safety & maintenance information