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Brian Bulley |
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Transportation and Maintenance Group |
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Loaded log trucks were unable to climb the grade
without the assistance of a grapple skidder, which would increase the haul
cost considerably. |
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Pope & Talbot asked FERIC to investigate
safe and economic alternatives to improve log truck gradeability on its
adverse road sections. |
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FERIC performed a theoretical analysis to
determine the degree of gradeability improvement available with reduced
drive-axle tire pressures. |
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Based on positive results of the analysis, a
field trial was subsequently scheduled. |
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As tire pressure is reduced the footprint
lengthens, increasing the tire contact area which improves the drive
traction and gradeability. |
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Improve the gradeability of Pope & Talbot’s
log trucks through reduced tire pressures. |
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Computer model to determine the gradeability |
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Validate results with data from previous trials |
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Provide accurate gradeability predictions for a
variety of tire inflations |
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Introduce low tire pressure concept to Pope
& Talbot staff and trucking contractor |
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Adjust drive axle tire pressures and attempt to
negotiate grade |
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Since loaded travel speeds were less than 60
km/h, the option of constant reduced pressure appeared the most cost
effective |
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Eliminated assist vehicle costs |
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Logging trucks ascended steep grade through the
use of reduced pressure on the drive tires |
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Notes