🔵 Free Engineering Tool

Pipe Sizing Calculator

Calculate flow velocity and friction pressure drop for copper, PVC, steel, stainless and polyethylene pipes. Real pipe schedule internal diameters. SI units.

💧 Water / Hydraulic
🔥 Gas

Water Pipe Sizing

Select pipe material, nominal size, and flowrate to calculate velocity and pressure drop.

Selected Pipe

DN25
ID: 27.0 mm | OD: 31.75 mm

Results

Internal Diameter
-mm
Pipe Area
-cm²
Flow Velocity
-m/s
Pressure Drop (per metre)
-Pa/m
Total Pressure Drop
-Pa
Total Pressure Drop (kPa)
-kPa

Recommended Velocity Limits (AS/NZS 3500)

Cold water, general ≤ 3.0 m/s
Hot water, distribution ≤ 2.0 m/s
Sanitary / drainage 0.6 – 3.0 m/s
Friction limit (max) ≤ 400 Pa/m

Gas Pipe Sizing

Size natural gas or LPG reticulation pipes using volumetric flow.

Gas pipe sizing must be verified by a licensed gas fitter. Pressure drop limits: ≤ 0.75 kPa for LP gas, ≤ 1.0 kPa for NG (AS/NZS 5601).

Selected Pipe

DN25
ID: 27.0 mm
Volumetric Flow (m³/h)
-m³/h
Gas Velocity
-m/s
Pressure Drop (Pa/m)
-Pa/m
Total Pressure Drop
-Pa

Need a full hydraulic design?

CCC Engineering delivers complete hydraulic packages, including water, sanitary, stormwater, gas reticulation, and pump systems with full IFC documentation.

Get a Quote Our Hydraulic Services