Pipe Pressure Loss Calculator
Hazen-Williams friction + static head for fire system pipe sizing
Pipe & Flow Parameters
Flow Rate
System demand
Pipe Schedule
Wall thickness
AU standard
Nominal Size
Pipe size
ID: 102.3 mm
Pipe Length
Straight pipe run
90Β° Elbows
Number of elbows
= 0m equivalent
Tees (branch)
Flow turned 90Β°
= 0m equivalent
Rise
Elevation increase
= 0 kPa static loss
Fall
Elevation decrease
= 0 kPa static gain
C-Factor
Hazen-Williams
roughness coefficient
Pipe Material (C-Factor)
Select a pipe material or enter a custom C-factor above
Pressure Loss Results
β
Friction Loss
β
Per Metre
β
Per 100m
β
Velocity
β
β οΈ
HAZEN-WILLIAMS FORMULA
P = 6.05 Γ 10β΅ Γ Q^1.85 / (C^1.85 Γ d^4.87) Γ L
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Pipe Size Reference
Click a row to use that pipe size (uses schedule selected above)
| Nominal Size | Internal Γ (mm) | Internal Γ (in) | Typical Use |
|---|
Velocity Guidelines
| Condition | Max Velocity | Notes |
|---|---|---|
| AS 2118.1 Sprinklers | 6 m/s (20 ft/s) | General limit for sprinkler systems |
| AS 2419.1 Hydrants | 10 m/s (33 ft/s) | Hydrant mains and risers |
| Pump suction | 1.5 m/s (5 ft/s) | To prevent cavitation |
| Pump discharge | 4.5 m/s (15 ft/s) | Recommended design velocity |
| Underground mains | 3 m/s (10 ft/s) | Typical design velocity |
Standards Reference
AS 2118.1 β Automatic fire sprinkler systems
AS 2419.1 β Fire hydrant installations
NFPA 13 β Standard for the Installation of Sprinkler Systems
NFPA 24 β Standard for the Installation of Private Fire Service Mains
We provide no warranty or guarantee for the use of this tool or its accuracy. In no event will we be liable for any loss or damage, including, without limitation, indirect or consequential loss or damage, or any loss or damage arising from loss of data or profits arising out of, or in connection with, the use of this tool.