Determine the appropriate number of Caterpillar 657G scraper

Determine the appropriate number of Caterpillar 657G scrapers and their production (in bcy/hr) for the following scenario: a. b. c. The scrapper is assisted by a push tractor, the operator will be able to effectively work only 50 min per hour the material is dry sand.

Solution

Solution:-

Given

Working time = 50 minute/hour

Let scraper have cycle time = 2.71 minutes

Let single push tractor with a cycle time = 1.65 minutes

Let Hauling = 20 LCY

Number of scrappers one pusher can support = 2.71/(1.65) = 1.64 ~= 2   Answer

P (BCY per hour) = 50/(2.71) * 2 * 20 * 0.8

P (BCY per hour ) = 590 BCY per hour   Answer

Where P = hourly production rate