Nitrogen Tire Filling Field Data Analysis NY City Transit, Flatbush Depot.

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Presentation transcript:

Nitrogen Tire Filling Field Data Analysis NY City Transit, Flatbush Depot

NYC Transit Bus Fleet Base Data Fleet Size285 Miles/yr (per vehicle)~25000 Fuel Cost ($)/gallon (corrected for current cost) ~2 Tire Life (years)~3 Test Period (months)>3 DatesDec ‘07 – Mar ‘08 Average Miles/gallon2.5 A trial was conducted by NYC Transit, NY Power Authority to evaluate the benefits of using Nitrogen in bus tires at NYCT’s Flatbush Avenue bus depot in Brooklyn, NY in December This rigorously collected data formed the basis for further conversion of other depots to nitrogen. Since then, 4 more depots have been converted to Nitrogen. Analysis done in this report is based only on field data collected in the trial.

Tires Requiring Top-off in 30 days Air Filled Tires Nitrogen Filled Tires

Number of Flat Tires Every Month Air Filled Tires Nitrogen Filled Tires

Pressure Loss Data Air Filled Tires Nitrogen Filled Tires

Impact of Under-Inflation Data from various Tire Companies Extra Fuel Consumption (%) Under Inflation (%)MichelinContinentalGoodyear Shortening of Tire Life (%) Under Inflation (%)MichelinContinental Most Conservative estimates from Michelin are used for cost savings

Fuel Consumption Impact Based on Michelin Data Air Filled Tires Nitrogen Filled Tires

Fuel Cost Impact Air Filled Tires Nitrogen Filled Tires

Tire Life Impact Air Filled Tires Nitrogen Filled Tires

Conclusions Nitrogen tire filling showed clear & demonstrated benefits over air filled tires as listed below: 1.Tires retained correct pressure for longer time Less tire top offs would result in lower labor cost Lower number of flat tires (by ~3/month) would help reduce expensive downtime and tire cost 2.Tire rolling resistance was reduced Lowered fuel consumption is projected to be $0.5 MM/year based on Michelin’s conservative basis 3.Tire friction and tire wear was reduced Tire life improvement is extrapolated to be about 20% based on the most conservative data