Engineering & Mining Journal

AUG 2018

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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TIRES AUGUST 2018 • E&MJ 45 www.e-mj.com by up to 18%. It's a unique way of either allowing you to speed up your trucks or de- termine when a tire is approaching its tem- perature limit and then perhaps reassign- ing the truck to a less demanding task." Bridgestone has offered its B-TAG tire monitoring system to giant-tire end users for several years, and recently introduced PressureStat, which supplements B-TAG and extends tire inflation monitoring ca- pabilities to underground mining, quar- rying and industrial applications that use other types of OTR tires. B-TAG hardware installed on the vehi- cle sends data from sensors in the tire to an onboard system, from where it can be forwarded to the mine dispatch system, a B-TAG handheld reader or downloaded directly for analysis. Mine operators not only can see data in real time to make immediate decisions, but data can also be compiled to identify pressure trends or assess and adjust operating conditions for more long-term solutions. The PressureStat system provides in- stant access to tire pressure and tempera- ture data, allowing customers to manage tire pressure accurately in real time. Its main features include: • Easy-to-install valve stem sensors; • Onboard alerts that allow drivers to see potential tire pressure issues before they affect operations; • Bluetooth connectivity that provides real- time pressure updates to mobile devices; • Instant inspection reports available on desktop or mobile devices for the entire fleet, using Bridgestone TreadStat tire and management software; and • Streamlined forecasting and analysis when combined with TreadStat, allow- ing users to report on the condition of tires and rims from any device anywhere in the world. Creating a Competitive Edge Johni Francis, global OTR product man- ager at Titan International, told E&MJ he sees a fairly wide spectrum of customer preferences when it comes to tire selec- tion; some are interested only in the pur- chase cost, others focus closely on cost per hour, and tire selection is generally a case-by-case process based on site condi- tions and operational necessities. He has noticed a definite competitive advantage among mine operators that have learned how to employ available technology to maximize tire and rim uptime. "The customers that are using tire pressure monitoring, tire tracking and oth- er related applications know exactly what's happening across the site at any given time. If they spot a tire-related problem such as underinflation or excessive heat buildup, they can act to solve it before it affects production," Francis explained. The visibility into tire status and perfor- mance provided by monitoring and tracking systems also can highlight when a change of tire design or composition might be ben- eficial, said Francis. "If a part of the fleet is switched from hauling ore to carrying overburden, for example, there's chance of an increase in tire cuts and other damage, or if a haul route becomes noticeably lon- ger, you may have to change over from a bias-ply to a radial tire or have to consider a different compound and/or tread pattern if already using a radial tire," he explained. "New tire monitoring technology and ana- lytics can highlight these problems before they can have a significant impact on cost per hour and productivity." Francis said Titan has developed two major innovations in tire and rim technolo- gy. The company's LSW (Low Sidewall) de- sign provides improved stability and per- formance in loader applications. LSW tires feature a larger rim diameter and smaller sidewall than conventional tires, which reduces swaying and bouncing of the ma- chine, resulting in less material spillage and operator discomfort. Titan also introduced three new siz- es to its Accelerated Change Technology (ACT) wheel line, a wheel concept that the company said has been proven to reduce downtime associated with tire changes and rotations by up to 50%. The ACT de- sign eliminates the need for the outside wheel to be removed when changing the inner tire. All the bolts stay on and there's no need to torque the wheel — whereas a standard wheel requires removing both the inner and outer wheels and re-torqueing. The ACT wheel is now available in 33-, 35-, and 49-in. versions featuring single-piece lock rings, in addition to 51-, 57- and 63-in. sizes. Titan said ACT wheels are designed to fit nearly any rigid framed dump truck and are compatible with any brand of OTR tire. Drying Out The topic of OTR wheel care often is overshadowed by concerns about tire maintenance and repair, but proper wheel maintenance can contribute appreciably to tire longevity. One of the most common problems that can affect both wheel and tire health is the presence of moisture, which not only corrodes steel wheels, but also reacts with rubber, according to OTR wheel manufacturer Rimex. Wheel corrosion leads to rough surfac- es and tire beads that don't seal properly, Rimex explained in a recent online blog post. Exposure to oxygen also ages the inner liner — the thin layer of rubber in- side the tire whose function is to keep air away from the carcass. As the inner liner ages, more and more air passes through it, leading to pressure losses that can av- erage 2 psi per month in truck tires. As it passes through the rubber, the oxygen can also corrode and rust the steel cords. Moisture can enter the picture from a number of angles, said Rimex, including: • Pooled water in tires that isn't suffi- ciently removed before installation. It is impossible to get all the water out of a tire using a bucket, so some sites use a vacuum system. • Wet rims and components. Moisture accumulates on components when they sit out in the elements, unprotected, or when they are cleaned with a hose prior to mounting. • Moisture buildup in inflation hoses. Water traps should be used on compres- sors, and at inflation stations, to remove as much water as possible before the air enters the tire chamber. • Steam generated by the moisture and heat of operation. Exposure to steam magnifies corrosion. • Moist or wet storage areas. Always store rims and wheels in dry environments. An effective way to stop wheel and rim corrosion, according to Rimex, is to add a corrosion inhibitor to the tire, prior to mounting. Corrosion inhibitors are coat- ings that are applied to the inside of the tire casing as part of the tire-mounting process, either by the maintenance shop or by a tire service provider. In general, inhibitors are composed of fibers and/or fillers in a viscous liquid suspension. Fi - bers may be textile filaments or other ma- terial. Fillers can include small particles of crushed rubber or plastics. An inhib- itor's performance depends on its com- pounding properties, and each supplier creates specific formulations for particu- lar applications. Rimex offers a premium rust inhibitor called Rimexcel.

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