Pipe Sizing Calculator
Calculate the required pipe diameter for a given flow rate and velocity, with the nearest standard pipe size.
How to Use the Pipe Sizing Calculator
- Enter the design flow rate in litres per second.
- Enter the design velocity in m/s (default 1.5).
- Click Calculate for required diameter and nearest standard size.
حالات الاستخدام
- •Domestic water supply pipe sizing.
- •Irrigation system design.
- •Fire sprinkler branch sizing.
- •Mechanical services engineering.
الصيغة
D = √(4Q / (π × v)), where Q is flow rate (m³/s) and v is velocity (m/s).
الأسئلة الشائعة
What velocity should I use?
Typical design velocity: 0.6–1.5 m/s for cold water, 1.0–2.0 m/s for hot water supply.
What standard sizes are used?
Standard DN sizes: 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200 mm.
Does this include friction losses?
No — this is a velocity-based sizing. A full hydraulic analysis is needed for long runs.