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.
What will be an ideal response?
AW small = -1,700,000(A/P,1%,120) – 12,000 + 170,000(A/F,1%,120)
= -1,700,000(0.01435) – 12,000 + 170,000(0.00435)
= $-35,656
AW large = -2,100,000(A/P,1%,120) – 8,000 + 210,000(A/F,1%,120)
= -2,100,000(0.01435) – 8,000 + 210,000(0.00435)
= $-37,222
Select small pipeline
You might also like to view...
The lockout/tagout procedure applies to vehicles that ________.
A) Have broken door locks B) Are parked but not locked C) Are partially disassembled D) Have lost license tags
Technician A says it is necessary to identify any and all non-factory installed electrical accessories when inspecting a vehicle. Technician B says non-factory installed electrical accessories may cause the system to not operate properly. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
If current flowing through a wire creates a magnetic field around the wire then to increase the strength of the magnetic field you would:
a. increase the length of the wire b. increase the diameter of the wire c. decrease the diameter of the wire d. increase the amount of current flowing through the wire
____________________, as it is applied to tightening nuts and bolts, is the amount of twisting force applied over distance.
Fill in the blank(s) with the appropriate word(s).