Pipe & Dosing-Line Sizing

Enter the average flow, fluid and pipe material — get the standard DN, the actual velocity against the recommended band, the Hazen-Williams friction headloss, and the right electromagnetic flowmeter. Sizing the line first is what makes the flow-meter range selection meaningful downstream.

1Flow & fluid

Average flow Q (10–200,000)m³/d

Peaking factor (1.2–3)

Fluid

Target velocity (see band)m/s

Water mains: 0.6–1.5 m/s. Below 0.6 → sedimentation / stagnation; above 1.5 → erosion & water-hammer risk.

2Pipe & run length

Material

Run length L (1–2000)m

Hazen-Williams is used for water & sludge (smooth-turbulent, the wastewater norm). For viscous chemical reagents switch to Darcy-Weisbach with the fluid viscosity — see the sheet.

Results — pipe size & headloss

Standard DN

—mm

Actual velocity

—m/s

Friction headloss

—m

Item	Value	Basis

Flowmeter recommendation

Line	Recommended meter	Why

Quote the meter & the line

The DN and flow above decide the meter size and lining. Send the duty — we quote the electromagnetic flowmeter at factory ex-works price (our margin is the export tax rebate), with PVDF / PTFE lining and tropical surge protection noted.

Request a quote ← Size the meter range

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Sources & parameter basis

[1]	Continuity equation D = √(4Q/πv); standard DN series per ISO 6708 (15–1200 mm).
[2]	Hazen-Williams: h_f = 10.67·L·Q^1.85 / (C^1.85·D^4.87), Q in m³/s, D in m — standard for water & wastewater mains.
[3]	Velocity bands: water 0.6–1.5 m/s; chemical dosing 0.5–1.0 m/s (limit erosion of corrosive lines); sludge 0.3–0.8 m/s (below settles, above scours & entrains air) — WEF MOP FD-13 / crane.
[4]	C values: PVC/HDPE 150, SS 140, DI cement-lined 130, aged steel 100 (typical engineering references).
[5]	Jiuyuhub catalogue: SE10A (DN 10–300, 24 V DC), SE11E (DN 2–2000), SE15 (insertion DN 200–4000, hot-tap).

Full derivation and worked example: Pipe-Dosing-Sizing-Calculation-Sheet.md.

Questions about a duty, a specification, or transparent sourcing? Contact our application engineers →