Audit source-labelled flow, velocity, circular area and theoretical inside-diameter arithmetic against one already documented candidate ID—without selecting nominal pipe, material or compliance.
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Reproduce source-labelled flow, velocity, circular area and theoretical inside-diameter arithmetic, then compare one already documented candidate inside diameter without selecting nominal pipe, material or compliance.
Check continuity arithmetic without a generic nominal-size list replacing the material and pressure-loss design.
Name the flow, velocity and candidate-ID sources; choose one paired unit system; inspect theoretical area/diameter and signed candidate differences.
Can trace every value while demand, velocity, material and final size selection remain in the responsible design.
Distinguish actual inside diameter from nominal/trade size and expose hidden GPM conversion.
Inspect the source cards, unit basis, converted flow, Q divided by V and candidate-minus-theoretical arithmetic.
No standard-size rounding, minimum-pipe recommendation or compliance verdict is generated.
Learn why one velocity equation cannot decide PEX, copper or another complete distribution system.
Run separate US and metric education records using actual candidate inside diameters from named sources.
Can reproduce the geometry and list pressure, friction, length, fittings, temperature, surge and approval checks the tool omits.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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Flow demand or measurement, the selected review velocity and the candidate's actual inside diameter can come from different responsible records. The tool keeps them named instead of deriving WSFU demand, choosing a velocity or treating nominal size as actual ID.
Record = flow source + velocity source + candidate-ID sourceUS entries convert GPM to cubic feet per second before division by ft/s; metric entries convert litres per second to cubic metres per second before division by m/s. The result is theoretical internal flow area and circular inside diameter, not a nominal product size.
A = Q ÷ V; theoretical ID = √(4A ÷ π)Positive, zero and negative differences are source-record comparisons only. They do not establish an undersized, minimum, acceptable or compliant pipe because pressure, friction, material, temperature, length, fittings, transients and installation are outside this equation.
ID difference = entered candidate ID − theoretical IDUpdated: August 2026
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Reproduce one reviewed hydraulic segment without turning one equation into a pipe-selection verdict. Name the responsible flow, velocity and candidate inside-diameter records; use one complete US or metric unit system; and inspect the theoretical circular area/diameter plus signed candidate differences. Demand, allowable velocity, material, pressure loss and approval remain in the complete design.