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Construction
Intermediate

Equipment Productivity

Calculate equipment production rates, cycle times, and cost analysis.

Before

Sample Problem

Calculate productivity for an excavation project:
- Equipment: CAT 336 Excavator (3.5 CY bucket)
- Material: Dense clay soil
- Average haul distance: 150 feet to dump truck
- Job efficiency: 50 minutes per hour (83%)
- Swell factor: 25%
- Operator skill: Average
- Total volume to excavate: 12,000 CY (bank measure)

Determine hourly production rate, days to complete, and cost per CY.
After

AI-Generated Solution

EQUIPMENT PRODUCTIVITY ANALYSIS

1. CYCLE TIME CALCULATION
   Bucket load time: 0.40 min
   Swing to truck (150 ft): 0.35 min
   Dump time: 0.15 min
   Return swing: 0.35 min
   Position for next load: 0.10 min
   ───────────────────────
   Total cycle time: 1.35 minutes

2. THEORETICAL PRODUCTION
   Bucket capacity: 3.5 CY
   Bucket fill factor (dense clay): 90%
   Actual bucket load = 3.5 × 0.90 = 3.15 CY

   Cycles per hour = 60 / 1.35 = 44.4 cycles
   Production (ideal) = 44.4 × 3.15 = 140 CY/hr

3. ADJUSTED PRODUCTION (Job Efficiency)
   Actual production = 140 CY/hr × 0.83 (efficiency)
   Q = 116 CY/hr (loose measure)

   Convert to bank measure:
   Q_bank = 116 / 1.25 (swell factor)
   Q_bank = 93 CY/hr (bank measure)

4. PROJECT DURATION
   Total volume: 12,000 CY (bank)
   Production rate: 93 CY/hr

   Hours required = 12,000 / 93 = 129 hours
   Days required = 129 / 8 = 16.1 days

   Use 17 working days

5. COST ANALYSIS
   Equipment rental: $185/hr
   Operator wage: $45/hr
   Fuel (15 gal/hr @ $3.50/gal): $52.50/hr
   Maintenance allowance: $18/hr
   ───────────────────────
   Total hourly cost: $300.50/hr

   Cost per CY = $300.50 / 93 CY
   Cost per CY = $3.23/CY

   Total project cost = 129 hrs × $300.50
   Total cost = $38,765

PRODUCTIVITY SUMMARY:
✓ Production rate: 93 CY/hr (bank measure)
✓ Project duration: 17 days
✓ Cost per CY: $3.23
✓ Total equipment cost: $38,765

Key Results

Production Rate
93 CY/hr
Project Duration
17 days
Cost per CY
$3.23
Total Cost
$38,765

Common Use Cases

Cost estimating
Schedule planning
Equipment selection
Bid preparation

Professional Review Required

This demo shows AI-generated output for preliminary design purposes only. All calculations must be verified by a licensed Professional Engineer (PE). Cognitive BuiltWorld assumes no liability for designs based on AI outputs.

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