Determine the cycle time for a single-engine scraper rated at 21 cy heaped that is used to haul material from a pit to a fill 900 ft away under severe conditions. The average haul speed will be 14 mph The average return speed will be 20 mph Assume, at an average speed of 5 mph that 200 ft is required to both accelerate and decelerate. The operating efficiency will be equal to a 50-min hour. It will take 0.80 min to load this scraper. distance,ft 88 conversion factor = Time, min. speed,mph x 88 Distance, ft. Speed, mph Time, min Haul 200 accelerate 5 500 14 200 decelerate 5 Return 200 accelerate 500 20 200 decelerate Travel time Travel time min Load time Dump time (see table 8.7) Turn time fill 0.21 Turn time cut 0.30 Total time min -
Determine the cycle time for a single-engine scraper rated at 21 cy heaped that is used to haul material from a pit to a fill 900 ft away under severe conditions. The average haul speed will be 14 mph The average return speed will be 20 mph Assume, at an average speed of 5 mph that 200 ft is required to both accelerate and decelerate. The operating efficiency will be equal to a 50-min hour. It will take 0.80 min to load this scraper. distance,ft 88 conversion factor = Time, min. speed,mph x 88 Distance, ft. Speed, mph Time, min Haul 200 accelerate 5 500 14 200 decelerate 5 Return 200 accelerate 500 20 200 decelerate Travel time Travel time min Load time Dump time (see table 8.7) Turn time fill 0.21 Turn time cut 0.30 Total time min -
Solid Waste Engineering
3rd Edition
ISBN:9781305635203
Author:Worrell, William A.
Publisher:Worrell, William A.
Chapter5: Separation Processes
Section: Chapter Questions
Problem 5.14P: Two materials, A and B, are to be separated using two unit operations, 1 and 2. The feed has 10...
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![Chapter 8 SCRAPER CYCLE TIME
(See ppg. 236-244)
Determine the cycle time for a single-engine scraper rated at 21 cy heaped that is
used to haul material from a pit to a fill 900 ft away under severe conditions.
The average haul speed will be 14 mph
The average return speed will be 20 mph
Assume, at an average speed of 5 mph that 200 ft is required to both
accelerate and decelerate.
The operating efficiency will be equal to a 50-min hour.
It will take 0.80 min to load this scraper.
distance,ft
88 conversion factor =
= Time, min.
speed,mph x 88
Distance, ft.
Speed, mph
Time, min
Haul
200 accelerate
500
14
200 decelerate
5
Return
200 accelerate
500
20
200 decelerate
Travel time
Travel time
min
Load time
Dump time (see table 8.7)
Turn time fill|
0.21
Turn time cut
0.30
Total time
min](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2fd2d543-31f1-4e74-add3-5ef381a047cc%2Fdcfa9cad-6263-4bbc-9d6e-ebc8ddce0482%2F1dok2zs_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Chapter 8 SCRAPER CYCLE TIME
(See ppg. 236-244)
Determine the cycle time for a single-engine scraper rated at 21 cy heaped that is
used to haul material from a pit to a fill 900 ft away under severe conditions.
The average haul speed will be 14 mph
The average return speed will be 20 mph
Assume, at an average speed of 5 mph that 200 ft is required to both
accelerate and decelerate.
The operating efficiency will be equal to a 50-min hour.
It will take 0.80 min to load this scraper.
distance,ft
88 conversion factor =
= Time, min.
speed,mph x 88
Distance, ft.
Speed, mph
Time, min
Haul
200 accelerate
500
14
200 decelerate
5
Return
200 accelerate
500
20
200 decelerate
Travel time
Travel time
min
Load time
Dump time (see table 8.7)
Turn time fill|
0.21
Turn time cut
0.30
Total time
min
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