Hydrant Flow Test

Simplified hydrant flow test calculator for field use

📋 Report Details

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Company Name

License # | Phone

Site

Client

Test Date

Tested By

Test Data

Enter Static Pressure

Enter Residual Pressure

Static = no flow (closed). Residual = measured while all outlets are flowing.

Select Pressure Units

Select Flow Units

Flow Outlets

Configure each outlet used during the test. Flow is calculated from residual pressure.

Outlet 1

Select Method

Calculated Flow

— L/s

Diameter (mm)

Diameter	Cd
12mm	0.985
16mm	0.985
19mm	0.983
22mm	0.982
25mm	0.976
28mm	0.972

✓ AS 2419.1:1994 Cd for 25mm nozzle

Diameter (mm)

Plate	Flow @ Pressure
16.6mm	5 L/s @ 700 kPa
23.4mm	10 L/s @ 700 kPa
27.9mm	10 L/s @ 350 kPa
28.7mm	15 L/s @ 700 kPa
30.3mm	10 L/s @ 250 kPa
32.0mm	10 L/s @ 200 kPa
33.1mm	20 L/s @ 700 kPa
34.1mm	15 L/s @ 350 kPa
34.4mm	10 L/s @ 150 kPa
37.1mm	15 L/s @ 250 kPa
39.4mm	20 L/s @ 350 kPa
40.6mm	30 L/s @ 700 kPa
42.9mm	20 L/s @ 250 kPa
45.3mm	20 L/s @ 200 kPa
48.3mm	30 L/s @ 350 kPa
48.7mm	20 L/s @ 150 kPa
52.5mm	30 L/s @ 250 kPa

Orifice Type	Cd
Sharp-edged orifice	0.62
Short tube (flush)	0.82
Rounded entry	0.97

Outlet Shape	Cd
Smooth & rounded	0.90
Square & sharp	0.80
Projecting into barrel	0.70
Stream straightener	0.95

Up to 3 outlets

Total Combined Flow

— L/s

System Requirements

Enter Required Flow

L/s

Enter Required Pressure

kPa

Enter the minimum flow and pressure required by your system.

Overall Result

—

Method: Q = Cd × A × √(2 × P / ρ)
Nozzle flow per AS 2419.1

Supply Curve

Supply Curve Pass Fail

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Quick Reference

Australia (AS 2419.1)

System Type	Flow	Pressure
Feed Hydrant	10 L/s	200 kPa
Unassisted Attack Hydrant	10 L/s	350 kPa
Assisted (Brigade Boosted / Gravity Tank) Attack	10 L/s	700 kPa
Onsite Hydrant Pump Attack	5 L/s	700 kPa

Australia – NSW

System Type	Flow	Pressure
Feed Hydrant	10 L/s	150 kPa
Unassisted Attack Hydrant	10 L/s	250 kPa
Assisted (Brigade Boosted / Gravity Tank) Attack	10 L/s	700 kPa
Onsite Hydrant Pump Attack	5 L/s	700 kPa

UK (BS 9990)

System Type	Flow	Pressure
Residential (1–2 storey)	8 L/s	1.7 bar
Residential (2+ storey)	20–35 L/s	1.4 bar
Commercial / Industrial	25 L/s	1.4 bar
Wet Riser Landing Valve	25 L/s	8 bar

USA (NFPA)

System Type	Flow	Pressure
Minimum Fire Hydrant	500 gpm	20 psi
Residential Area	1,000 gpm	20 psi
Commercial / Industrial	1,500–3,000 gpm	20 psi
High Value District	3,500+ gpm	20 psi

Standards Reference

AS 2419.1:1994 — Fire hydrant installations - System design, installation and commissioning

BS 9990 — Non-automatic fire-fighting systems in buildings

NFPA 291 — Recommended Practice for Fire Flow Testing and Marking of Hydrants

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.