Pipe Volume Calculator

Berikut versi yang sudah dipadatkan menjadi di bawah 4.000 karakter (versi ini sekitar 2.950 karakter):

Pipe Volume Calculator works out how much water a piping system holds — and everything that follows. Pick the sizes and schedules, type the lengths, count the fittings, and read the gallons, litres, flow velocity and the time to fill, flush and dose the system. It works fully offline — nothing you enter ever leaves your phone.

This is a calculator about the CONTENTS of the pipe, not its weight. Volume is what you need when purging a line, chlorinating a new main, charging a heating circuit with glycol, sizing an expansion vessel, or working out how long after opening a valve the water at the far end will change.

HOW IT WORKS

Pipe size is a name, not a measurement. Four-inch pipe is 4.500 in across the outside whatever the schedule; a heavier schedule thickens the wall inward. So the app looks the bore up in the ASME B36.10M table: bore = outside diameter minus twice the wall.
Run volume is the classic formula — pi x inside radius² x length. Four-inch Schedule 40 comes out at 0.661 gallons/ft; two-inch at 0.174.
Real systems are never one size, so the app sums a header or main plus two branch runs, each with its own size and length, into one system total in gallons and litres.
Fittings are added on top. Every elbow, tee and valve is a short piece of bore, charged as 2.5 nominal diameters of extra centreline.
From volume and flow rate come the times. Fill/drain is volume over flow; a flush is the number of system volumes you want exchanged. Velocity = 0.4085 x GPM / bore², and run over velocity gives residence time.

WHAT YOU CAN DO

Sum a header and two branch runs of different sizes into one system volume
Choose any NPS from 1/2 to 24 in and Schedule 5, 10, 40, 80, 160 or XXS
Add fittings by count and see how much volume they contribute
Read flow velocity, with a warning above the 8 ft/s limit or below 2 ft/s (too slow to scour a line clean)
Get fill, drain, flush and slug-travel times at your flow rate
Work out chlorine dose in grams, and the litres of 12.5% hypochlorite it means, from 0 to 200 mg/L
Work out the glycol charge for an antifreeze percentage, and the expansion of a closed heating circuit between cold fill and flow temperature
Open Details for a segment-by-segment breakdown and a table of bore, gallons per 100 ft and velocity by size

BUILT FOR CLARITY
A cool steel-cyan waterline design puts the system volume first, with velocity and timings beside it. Light and dark themes, a tiny download, no clutter, no account.

AN ESTIMATE, NOT A HYDRAULIC DESIGN
This is a simplified educational tool. It counts pipe and fittings only — tanks, cylinders, boilers, pumps, valve bodies and heat emitters hold water too and must be added separately. Bores are nominal, so tolerance, lining, coating and scale shift the real figure. Flow splits between branches, so branch velocity is deliberately conservative. Fill and drain figures are volume over flow, not a gravity-drainage model. Dosing figures help you order chemical; they are not a disinfection procedure. Always follow the applicable standard, manufacturer's instructions and your local water authority, and have a qualified engineer or plumber confirm anything that matters. For general information and education only; not professional engineering advice.

PRIVACY
No personal data collected; fully offline. Ads via Google AdMob, which may use an advertising identifier per Google's policies.

Download Pipe Volume Calculator and know exactly what is inside your pipework before you fill it, flush it or dose it.