A chemical engineer is considering two sizes of pipes for moving distillate from a refinery to the tank farm. A small pipeline will cost less to purchase (including valves and other appurtenances), but will have a high head loss and, therefore, a higher pumping cost. The small pipeline will cost $1.7 million installed and have an operating cost of $12,000 per month. A larger-diameter pipeline will cost $2.1 million installed, but its operating cost will be only $8000 per month. Which pipe size is more economical at an interest rate of 1% per month on the basis of an annual worth analysis? Assume the salvage value is 10% of the first cost for each pipeline at the end of the 10-year project.

ENGR.ECONOMIC ANALYSIS
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ISBN:9780190931919
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Chapter1: Making Economics Decisions
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A chemical engineer is considering two sizes of
pipes for moving distillate from a refinery to the
tank farm. A small pipeline will cost less to purchase
(including valves and other appurtenances),
but will have a high head loss and, therefore, a
higher pumping cost. The small pipeline will cost
$1.7 million installed and have an operating cost of
$12,000 per month. A larger-diameter pipeline will
cost $2.1 million installed, but its operating cost
will be only $8000 per month. Which pipe size is
more economical at an interest rate of 1% per
month on the basis of an annual worth analysis?
Assume the salvage value is 10% of the first cost
for each pipeline at the end of the 10-year project.

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