A hydronic piping scope has 28 straight pipe pieces, each 20 ft long. The insulation order includes 5 percent for cuts and fittings. What insulation length should be carried?
Correct Answer
A) 588 ft
Base length is 28 x 20 = 560 ft. Adding 5 percent gives 560 x 1.05 = 588 ft. Other choices omit waste, add only half the allowance, or round to a larger stock number.
Why This Is the Correct Answer
Base length is 28 x 20 = 560 ft. Adding 5 percent gives 560 x 1.05 = 588 ft. Other choices omit waste, add only half the allowance, or round to a larger stock number.
Why the Other Options Are Wrong
Option B: 560 ft
pipe insulation length, choice a: 560 ft is an intermediate from the steps (Base length is 28 x 20 = 560 ft.); the calculation continues to 588 ft.
Option C: 574 ft
pipe insulation length, choice b: 574 ft is wrong because 574 ft implies about 2.5 percent added to 560; the stated add-on is 5 percent in.
Option D: 600 ft
pipe insulation length, choice c: 600 ft implies about 7.14 percent added to 560; the stated add-on is 5 percent in.
Memory Technique
Say the pipe insulation length rule aloud as a chain; the chain ends at 588 ft, not an intermediate stop.
Reference Hint
Open Mechanical and Electrical Systems for Construction Managers, 4th Ed., 2024; use the index entry or section for "Pipe insulation length takeoff" to confirm that Base length is 28 x 20 = 560 ft.
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