01 / PIPE FLOWPLUMBING
Pipe Flow Velocity
Compute average water velocity using internal pipe diameter and volumetric flow rate.
Enter flow rate and internal diameter.
v = Q / (πD²/4). Uses the entered internal diameter.
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MECHANICAL · CONSTRUCTION · TECHNOLOGYEST. 2026
BUILT FOR CURIOUS MINDS AND PRACTICAL THINKERS.MECHANICAL ✳ HVAC ✳ PLUMBING ✳ CONSTRUCTION
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BEI ENGINEERING TOOLBOX / PLUMBING
Plumbing calculators.
Clear fundamentals.
Practical preliminary calculations for water systems. These are not automatic pipe-sizing or plumbing-code compliance tools.
3 CALCULATORS
02 / STORAGEPLUMBING
Water Storage Volume
Calculate the gross volume of a rectangular water tank.
Enter tank dimensions.
V = L × W × H. Excludes freeboard and unusable volume.
03 / GRAVITY FLOWPLUMBING
Gravity Flow Rate
Estimate full-pipe discharge from known average velocity and internal diameter.
Enter pipe diameter and average velocity.
Q = A × v. Assumes full-pipe flow; not a drainage design model.
Engineering note: These calculators are for preliminary education and checks only. Verify allowable velocities, fixtures, pressure requirements, storage capacity, drainage conditions, and all applicable codes before using results for engineering design.
BEI 5.5 / PLUMBING ENGINEERINGReturn to journal →
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Benzon Engineering Insights is an independent knowledge platform created to make engineering concepts easier to understand and practical knowledge easier to access.
Founded by CLIFFORD BENZON, RMEE, the platform is intended for engineering students and practicing professionals who believe that learning continues beyond the classroom.
CLIFFORD BENZON, RMEEFOUNDER & ENGINEERING AUTHOR