Step 1: Determine Minimum Required Working Pressure (WP)
WP = (RP + H1 + FL) × FoS
Auto-filled based on system year
HMDH above lowest point
From hydraulic calculations or use 100 kPa minimum
Auto-filled based on system year (can be manually changed)
Reference Tables
Table D.1: Minimum Residual Pressure
| Year(s) | Fire Hydrant System | Minimum Residual Pressure (kPa) |
|---|---|---|
| 1921 to 1974 | HOB Act / CA17 | 700 |
| 1974 to 1994 | Ordinance 70 | 700 |
| 1994 onwards | AS 2419.1 | 700 |
Table D.2: Minimum Required Factor of Safety
| Year(s) | Fire Hydrant System | Factor of Safety |
|---|---|---|
| 1921 to 1974 | HOB Act / CA17 | 1.25 |
| 1974 to 1994 | Ordinance 70 | 1.25 |
| 1994 onwards | AS 2419.1 | 1.5 |
Step 2: Determine Hydrostatic Test Pressure (HTSP)
HTSP = WP +/- H2
Enter the WP calculated from Step 1
Height from booster to lowest point in system
Step 3: Determine Make-Up Water Allowance
⚠️ Important: Make-up water must not exceed the calculated allowance for the system to pass the hydrostatic test.
Testing Procedure & Acceptance Criteria
📋 Testing Procedure
Follow the standard hydrostatic testing procedure as outlined in the relevant fire hydrant system standard (AS 2419.1, Ordinance 70, or HOB Act/CA17).
✅ Acceptance Criteria
The system passes if the make-up water required during the test period does not exceed the calculated allowance above.