A hydronic piping flush calculation converts pipe volume from cubic feet to gallons. Which conversion should be used for water volume?
Correct Answer
C) 1 cf = 7.48 gal
One cubic foot contains approximately 7.48 gallons. Other choices confuse volume with water weight or use rough nonmatching field numbers.
Why This Is the Correct Answer
One cubic foot contains approximately 7.48 gallons. Other choices confuse volume with water weight or use rough nonmatching field numbers.
Why the Other Options Are Wrong
Option A: 1 cf = 6.00 gal
In mechanical and plumbing, 1 cf = 6.00 gal is the wrong selection for Water volume: 1 cf = 6.00 gal is a different published number than the cited Water volume value; Water volume conversion supports 1 cf = 7.48 gal.
Option B: 1 cf = 8.34 gal
The trap in B is 1 cf = 8.34 gal. That selection is wrong because 1 cf = 8.34 gal is a different published number than the cited Water volume value; Water volume conversion supports 1 cf = 7.48 gal; One cubic foot of water volume equals approximately 7.48 gallons.
Option D: 1 cf = 12.00 gal
Choice D (1 cf = 12.00 gal) is rejected because 1 cf = 12.00 gal is a different published number than the cited Water volume value; Water volume conversion supports 1 cf = 7.48 gal. The cited answer is 1 cf = 7.48 gal.
Memory Technique
Make water volume a tabbed card: cite the exact condition, then choose 1 cf = 7.48 gal.
Reference Hint
Open Mechanical and Electrical Systems for Construction Managers, 4th Ed., 2024; use the index entry or section for "Water volume conversion" to confirm that One cubic foot contains approximately 7.48 gallons.
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