🚒 Hydrant System Designer
Ring main hydraulic calculations for fire hydrant systems — AS 2419.1
1 Building & Design Requirements
AS 2419.1 Table 2.1 — typically 2 for warehouses <24,000m²
Distributed evenly around ring main
2 Ring Main Configuration
AS 2419.1 minimum DN100
At property boundary, single feed to ring main
Perimeter: 300 m
Spacing: 25 m
Path to remote: 150 m
3 Booster Assembly (Town Main Fed)
H-pattern booster per AS 2419.1 Figure 7.2 — town main → suction hydrants → booster inlets → check valve → ring main
Booster Discharge Fittings (included automatically)
✓ Gate valve (isolation)
✓ Check valve (NRV)
✓ Elbows (as selected)
✓ Tee into ring main
4 Hydrant Risers (Dual Outlet)
AS 2419.1 requires DN100 min for dual outlet hydrants
5 Isolation Valves (AS 2419.1 Fig K12)
Ring main must be isolatable into sections of not less than 20% and not more than 33% of total length. This requires 3 to 5 valves on the ring main.
Sluice valves per Figure K13
Adjacent to ring main connection
Isolation Section Check
Checking...
Also required (not calculated): Isolating valves on branches supplying more than one hydrant,
and on branches leading into buildings.
6 Hydraulic Results
Calculating...
System hydraulic analysis
Booster Outlet
—
kPa required
Design Flow
—
L/min
Booster Pipe
—
kPa
Ring Friction
—
kPa
Riser Friction
—
kPa
Static Head
—
kPa
⏳
Ring velocity ≤ 6 m/s
⏳
Hydrant spacing ≤ 60m
⏳
Riser ≥ DN100
⏳
Ring main ≥ DN100
⏳
Valve sections 20-33%
Pressure Breakdown
| Component | Description | Loss (kPa) |
|---|
View Detailed Calculation
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This tool provides preliminary calculations only. Final designs must be verified by a qualified fire protection engineer. We provide no warranty or guarantee for the use of this tool or its accuracy.