A consulting engineer is considering two pumps to meet a demand of 15,000 gallons/minute at 12 feet total dynamic head. The specific gravity of the liquid being pumped is 1.50. Pump A operates at 70% efficiency and costs $12,000; pump B operates at 75% efficiency and costs $18,000. Power costs $0.015/kilowatt-hour. Continuous pumping for 365 days/year is required (i.e., 24 hours/day). Using a MARR of 10% and assuming equalsalvage values for both pumps, how many years of service are required forpump B to be justified economically? (Note: Dynamic head times gallon/ minute times specific gravity divided by 3960 equals horsepower required. Horsepower times 0.746 equals kilowatts required.)

Cornerstones of Cost Management (Cornerstones Series)
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ISBN:9781305970663
Author:Don R. Hansen, Maryanne M. Mowen
Publisher:Don R. Hansen, Maryanne M. Mowen
Chapter13: The Balanced Scorecard: Strategic-based Control
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A consulting engineer is considering two pumps to meet a demand of 15,000 gallons/minute at 12 feet total dynamic head. The specific gravity of the liquid being pumped is 1.50. Pump A operates at 70% efficiency and costs $12,000; pump B operates at 75% efficiency and costs $18,000. Power costs $0.015/kilowatt-hour. Continuous pumping for 365 days/year is required (i.e., 24 hours/day). Using a MARR of 10% and assuming equal
salvage values for both pumps, how many years of service are required for
pump B to be justified economically? (Note: Dynamic head times gallon/ minute times specific gravity divided by 3960 equals horsepower required. Horsepower times 0.746 equals kilowatts required.)

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