During the look-ahead planning meeting at the emergency-generator enclosure, a sanitary pipe run has a 72 ft run at 1.00% slope. What invert drop is required in inches?
Correct Answer
B) 8.6 in.
Convert run to inches and multiply by the slope percentage expressed as a decimal.
Why This Is the Correct Answer
Convert run to inches and multiply by the slope percentage expressed as a decimal.
Why the Other Options Are Wrong
Option A: 0.7 in.
0.7 in. is below the supported result for sanitary pipe run; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 10.8 in.
10.8 in. is above the supported result for sanitary pipe run; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 9.3 in.
9.3 in. is above the supported result for sanitary pipe run; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Measure to convert, adjust for inches, then let Field Engineer set the finish line.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Plumbing coordination; pipe slope calculation; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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