EP 1110-1-8
(Vol. 11)
31 July 03
APPENDIX C
GUIDE FOR SELECTING OPERATING CONDITIONS (Continued)
EQUIPMENT TYPE
AVERAGE
SEVERE
R10:
Hard rock, excessive wear
Light rock, medium
Rippers and Bank Slopers
due to high breakout
breakout force required.
force.
6,500 hours
8,000 hours
Depreciation Period:
S10, S15, S20, and S25:
High impact conditions,
Varying loading and haul
Scrapers
such as loading ripped
road conditions; long and
Self-Propelled
rock; overloading,
short hauls; adverse and
Tractor Drawn
continuous high total
favorable grades; some
Soil Stabilizers
resistance conditions; and
impact; and typical road-
rough haul roads.
building use on a variety
of jobs.
8,000 - 13,500 hours
10,000 - 15,000 hours
Depreciation Period:
T15:
Heavy rock ripping;
Production dozing in
Tractors
tandem ripping;
clays, sands, gravels, and
Crawler (Dozer)
pushloading and dozing in
talus rock. Push-loading
hard rock; work on rock
scrapers, borrow pit
surfaces; continuous high
ripping, most land clearing
impact conditions; and
and skidding applications.
saltwater environment.
Medium impact
conditions. Production
landfill work.
8,000 - 12,500 hours
10,000 - 15,000 hours
Depreciation Period:
C-6
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