Presentation on theme: "OFF THE ROAD (OTR) TIRE OUT-OF-SERVICE CRITERIA"— Presentation transcript:
1 OFF THE ROAD (OTR) TIRE OUT-OF-SERVICE CRITERIA Dean NicholsJim Angel
2 DISCLAIMERThe 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 manufacturer’s 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
3 Running Tires to Destruction is Not Recommended Its not a safe practicePotential for loss of control of the vehiclePotential for debris to injure personnel if tire rupturesTires with a damaged structural component (are) can create a safety hazard
4 Identifying the Structural Components of a Tire The tire manufacturer, or their authorized representative, should be consulted since tires have different designsInspection of defects, such as determining the depth of cuts, on a pressurized tire can create a safety hazard- safely deflate the tire before inspection
5 Identifying the Structural Components of a Tire Typically tires have non-structural impact/penetration belts between the tread and the tire’s structural beltsTires with exposed impact/penetration belts should be scheduled for inspection and, if necessary, maintenanceTires with exposed structural belts should be removed from serviceThe ply rating is a nominal strength rating and does not indicate the actual number of beltsContinental Tire considers a tire with any belt exposed no longer “viable”
6 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 areaTires with exposed turn up wires should be scheduled for inspection and, if necessary, maintenanceTires with exposed sidewall structural belt wires should be removed from service
8 Identify the Structural Components of a Tire Damaged rims can damage tiresRims with minor damage should be scheduled for maintenance, cracked rims or damaged lock rings should be immediately removed from serviceWheel driver keys are not considered structural componentsMissing 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
10 Structural Components of a Tire Many defects in the tread and sidewall areas can be repairedThe tire manufacturer establishes the tire’s repair limitsProper repair is essential to maintain the safety of the tireMoving a tire with a structural defect to a inside rear axle position is an unsafe practice
11 Maintenance TrainingTire maintenance schedules and tire out-of-service criteria should be developedEquipment operators should visually inspect tires during the pre-shift inspection and be trained to recognize hazardous tire defectsMaintenance personnel should be trained to safely and properly inspect and repair tires
12 Maintenance Training Society of Automotive Engineers: Off Road Tire Conditions Removal Guidelines- DraftDraft available for review, comments requestedNote- this document does not affect Agency policy
13 Typical DefectsBulge : 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.
14 Typical DefectsCut : Damage made by sharp or jagged objects (e.g. rocks, rock fragments). Also known as a snag.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.Puncture : Any penetration of a tire’s 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.
30 Safety Awareness Program Safety References Tire Safety is Just One Part of a Mine Haulage System Safety ProgramMSHA’s Tire and RimSafety Awareness ProgramMSHA’s Haul Road Inspection Handbook
31 Safety ReferencesTruck Driver’s Safe Operating Procedures -http://www.msha.gov/S&HINFO/SAFETY/HCARD/TRUCKSAF.HTM100-TON OR GREATER TRUCK PREOPERATION INSPECTION -Design of Surface Mine Haulage Roads – A Manual, IC 8758 –
32 Safety ReferencesTire manufacturers, tire industry organizations, and machine manufacture’s tire safety and maintenance informationMany available sources- the following are provided as examples, no MSHA endorsement or determination of suitability is implied
33 Safety ReferencesTire Industry Association- OTR Tire Mount/Demount Training & Certificate Program-Tire Retread Information Bureau-
34 Safety ReferencesGoodyear-Reference Goodyear’s “Cause and Prevention of Typical Earthmover Tire Failures”Michelin-
35 Bridgestone - http://www.bfor.com/tire_management/index.asp Safety ReferencesBridgestone -Also see Bridgestone’s Tire Damage Checklist and Tire Management SoftwareContinental-
36 Safety ReferencesYokohama-Rimex- Safety information and TyreSense-Fuller Brothers, Inc.- Tire Analysis System-Arnco- Tire Flatproofing-
37 Safety ReferencesTen Do's and Don'ts of Tire Management Basic maintenance and care contributes to maximum tire performance, tire life, and operator safety.
38 Safety ReferencesTire Incentive Program Provides Savings for Phelps Dodge and Scholarships to Local Youth-