The tires on all emergency vehicles are one of the biggest fleet expenses, and that they must be considered belongings, not consumables. Consumables refer to products this is offered and consumed. Truck tires want to be dealt with as an asset tracked and controlled from the time of buy to retreading to remaining disposal.
Every fleet has to implement a few kinds of the tire management program. First, remember that the tire generation has superior through the years. More recent tire compounds, a computer software program for tracking, inflation gauges, and different equipment can help control your tire application. One of the first steps is to decide how the “rubber meets the road” by thinking about the type of application, weather, terrain, and weight to choose the high-quality tire for the task. While new technology is to be had for tire control, your program can nevertheless achieve success the old-fashioned way—with pencil, paper, and a regular tire gauge. What’s critical is having a program.
When enforcing a tire control software, including the most modern NFPA 1911 Standard for the Inspection, Maintenance, Testing, and Retirement of In-Service Fire Apparatus, the 2017 Edition. When it comes to tires, follow the statistics in Chapter 8, which incorporates:
8.3.3* Tires shall be inspected for damage and inflated to the tire producer’s endorsed strain.
8.Three.Four* The tire load score shall be checked to verify that it meets or exceeds the GAWR (gross axle weight rating).
8.3.5 The tire speed rating shall be checked to verify that it meets or exceeds the maximum top pace of the apparatus.
8.3.6* Tires shall get replaced at the least every 7 years or extra frequently when the tread put on exceeds kingdom or federal standards as determined with the aid of measuring with a tread depth gauge.
(Some sections consist of asterisks, which signal that extra explanatory statistics are annexed to the usual.)
Keeping tires well inflated is foremost. No, you could just look at a tire and tell whether it has the precise inflation strain. Instead, the tire program ought to encompass focused pressures for tires based on the weight of every axle, calibrated air pressure gauges, and having someone check tire pressures every week.
It is vitally vital that you observe the tire producer’s data book to correctly inflate the tire according to the utility and man or woman axle weight. While the tire sidewall has a most tire inflation strain, it is imperative to first weigh the front and rear axles in my view and then observe the tire statistics book, which can be received from the producer or from the producer’s website.
To attain the tire length and weight rating, check the truck manufacturer’s facts plate, typically at the driving force’s door jamb, and take a look at the information furnished. The records plate notes the proper tire inflation for the front and rear tires based on the axle score. Compare that information to the tire’s sidewall, the certified weight of each axle, and then analyze all of that compiled records and evaluate it to the tire records ebook with the spreadsheet that consists of rankings for that tire.
Keeping up with inflation
The bottom line on inflation is which you cannot run beneath the minimum pressures required to guide the axle load, and also, you ought to now not run the tire over the maximum strain listed at the side of the tire. So the excessive value of overloading or overinflating or underinflating is:
- Reduced managing (a protection issue)
- Longer stopping distances (a safety problem)
- Rapid tire put on (a value issue)
- Rapid issue wear to bearings, springs, steering, and wheels (a cost difficulty)
- Excessive gasoline intake (value trouble)
- Tire disasters (protection and price troubles)
When looking at the tire structure and application, such as weight versus tire strain, remember that each tire makes a certain footprint on the road. With that in mind, the proper tire stress must be reached because overinflating or underinflating will alternate the footprint. Incorrect tire pressures will distort tire performance, causing the tire to paintings more difficult, probably inflicting elevated tire failure and increasing fuel usage. Under-inflation by way of as an awful lot as 20 percent can lower the tire existence by way of 30 percentage.
Other strategies may be carried out to improve tire performance and toughness. Look at proper general vehicle alignment and take a look at surprise absorbers. Rather than simply inspecting tires for nails or screws, make sure to search for uneven tire put on to indicate mistaken toe and camber. Ensure that the technicians appearing everyday maintenance are educated to search for uneven tire wear that can imply other problems with the car.
When the firehouse crews wash the vehicles, they reduce the wear and tear of the tires. Washing tires with heat soapy water allows getting rid of premature aging and deterioration of the rubber because of contaminants on the street. For example, the magnesium chloride sprayed on the roads in the winter season can have an effect on the rubber on tires, in addition to aluminum and electrical components. In addition, any petroleum-based merchandise, consisting of clean oil used on newly paved roads, leaking oil seals, or oil on the firehouse floor can reason tire deterioration.
Chapter 6 of the NFPA 1911, out-of-carrier standards, address deficiencies that need to purpose equipment to be taken out of service, among them troubles related to chassis, axles, steerage and suspension structures, drivelines, wheels, and tires.
For example, amongst deficiencies specified in segment 6.Three.1 inside the standard:
The GAWR shown on the vehicle weight score label is greater than the tire producer’s load score. When weighed by Section 19.2, the load on the front axle, the burden at the rear axle, or the overall gross weight of the emergency vehicle exceeds the values shown on the car weight score label. This is because tires have cuts inside the sidewall that penetrate to the twine.
*Tires have a tread depth of fewer than 4∕32 inches (three.2 mm) on any steering axle or 2∕32 inches (1.6 mm) on any non-steering axle at any two adjacent primary tread grooves anywhere on the tire. Therefore, the retired speed score is less than the ruled automobile pace rating of the car. Take time to take a seat down and examine the NFPA standard in its entirety. Some sections consist of asterisks, which signifies that additional explanatory statistics are annexed to the standard.