Presentation on theme: "OFF THE ROAD (OTR) TIRE OUT-OF-SERVICE CRITERIA Dean Nichols 304-547-2308 Jim Angel 304-547-2064."— Presentation transcript:
OFF THE ROAD (OTR) TIRE OUT-OF-SERVICE CRITERIA Dean Nichols Jim Angel
DISCLAIMER The information and recommendations contained in this presentation are to be considered for illustrative and general information purposes in recognizing and evaluating common off road tire out of service criteria only and should not be relied upon as being a comprehensive treatment on the subject. This presentation does not attempt to assess all of the facts and circumstances in evaluating off road tire out of service criteria, and inspectors must consider and evaluate all factors when making a determination whether a tire defect rises to the level of a hazard that would result in a finding that a violation exists at a mine. The inspector should not cite to the manufacturers specs as reason for the citation. The citation should rely on facts as seen by the inspector. The off road tire out of service criteria in the presentation cannot be referred to in any citation and any enforcement actions cannot be initiated by inspectors regarding tire safety based solely on this presentation. This material should be used for training purposes only. It is not a compliance guide, but rather a collection of good practices from MSHA, NIOSH, and private sector sources
Running Tires to Destruction is Not Recommended Its not a safe practice –Potential for loss of control of the vehicle –Potential for debris to injure personnel if tire ruptures Tires with a damaged structural component (are) can create a safety hazard
Identifying the Structural Components of a Tire The tire manufacturer, or their authorized representative, should be consulted since tires have different designs Inspection of defects, such as determining the depth of cuts, on a pressurized tire can create a safety hazard- safely deflate the tire before inspection
Identifying the Structural Components of a Tire Typically tires have non-structural impact/penetration belts between the tread and the tires structural belts –Tires with exposed impact/penetration belts should be scheduled for inspection and, if necessary, maintenance –Tires with exposed structural belts should be removed from service –The ply rating is a nominal strength rating and does not indicate the actual number of belts Continental Tire considers a tire with any belt exposed no longer viable
Identifying the Structural Components of a Tire Typically, tires have one structural belt in the sidewall area with a non- structural turn up of the belt in the bead area –Tires with exposed turn up wires should be scheduled for inspection and, if necessary, maintenance –Tires with exposed sidewall structural belt wires should be removed from service
RADIAL TIRE Tread Shoulder Sidewall Air Chamber Bead Bundle Chafer Turn Up Ply Belts From SAE J2611 Draft
Identify the Structural Components of a Tire Damaged rims can damage tires –Rims with minor damage should be scheduled for maintenance, cracked rims or damaged lock rings should be immediately removed from service Wheel driver keys are not considered structural components –Missing keys can allow the rim to slip, wear the o- ring, and cause the loss of air pressure, missing keys should be scheduled for maintenance
Driver Key Insert Damaged rim
Structural Components of a Tire Many defects in the tread and sidewall areas can be repaired The tire manufacturer establishes the tires repair limits Proper repair is essential to maintain the safety of the tire Moving a tire with a structural defect to a inside rear axle position is an unsafe practice
Maintenance Training Tire maintenance schedules and tire out-of- service criteria should be developed Equipment operators should visually inspect tires during the pre-shift inspection and be trained to recognize hazardous tire defects Maintenance personnel should be trained to safely and properly inspect and repair tires
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 Maintenance Training
Typical Defects Bulge : An area of separation packed with rubber that has migrated from an adjoining area of the separation. Blister : A localized bubble on the surface of a tire. Chipping : Flaking or tearing away small bits of tread rubber. Chunking : Tearing or breaking away pieces of tread rubber. Cracks : Splits or narrow breaks in rubber compounds not caused by a foreign object. Also known as a split.
Typical Defects Puncture : Any penetration of a tires air chamber by a foreign object resulting in loss of air. Separation : The parting of de-bonding of any adjacent parts of the tire (ply to ply, ply to rubber, etc. Exposed Cord : Belt/Breaker, ply (usually nylon or steel) or other reinforcement and steel chafer/bead area reinforcement that can be seen. Excludes fabric (usually nylon) chafer. Cut : Damage made by sharp or jagged objects (e.g. rocks, rock fragments). Also known as a snag.
Safety References Tire Safety is Just One Part of a Mine Haulage System Safety Program MSHAs Tire and Rim Safety Awareness Program MSHAs Haul Road Inspection Handbook
Safety References Truck Drivers Safe Operating Procedures - TM 100-TON OR GREATER TRUCK PREOPERATION INSPECTION - Tmore.HTM Design of Surface Mine Haulage Roads – A Manual, IC 8758 –
Safety References Tire manufacturers, tire industry organizations, and machine manufactures tire safety and maintenance information Many available sources- the following are provided as examples, no MSHA endorsement or determination of suitability is implied
Safety References Tire Industry Association- OTR Tire Mount/Demount Training & Certificate Program- Tire Retread Information Bureau-
Safety References Goodyear- Reference Goodyears Cause and Prevention of Typical Earthmover Tire Failures Michelin- nfo/ProductInfo.Html, 6.html
Safety References Bridgestone - Also see Bridgestones Tire Damage Checklist and Tire Management Software Continental- online.com/generator/www/us/en/continental/otr/themes/tech_d nloads/downloads_en.html
Safety References Yokohama- Rimex- Safety information and TyreSense- Fuller Brothers, Inc.- Tire Analysis System- Arnco- Tire Flatproofing-
Safety References Ten Do's and Don'ts of Tire Management Basic maintenance and care contributes to maximum tire performance, tire life, and operator safety.
Safety References Tire Incentive Program Provides Savings for Phelps Dodge and Scholarships to Local Youth - nerPageSimpleNav.aspx?NRMODE=Published&NRORI GINALURL=%2fCommunity- Environment%2fCommunityRelations%2fEmployeeInvol vement%2fCaseStudies%2ehtm&NRNODEGUID=%7b1 4E6B5F5-766F-4DCB-95E9- D1140D2C2166%7d&NRCACHEHINT=Guest#tireincenti ve