🔒 Password Required
Enter the access code to use this calculator.
Incorrect password. Please try again.
Hydrostatic Commissioning Test
AS 2419.1:2021 Appendix S — Hydrant System Hydrostatic Test Procedures
Step 1: Which Test?
Pick the option that matches the system. The required pressure and how long to hold it will fill in automatically.
Enter the two heights below, measured up from the lowest point of the pipework (from the drawings or measured on site). The calculator works out the test pressure for you.
Have designed pressures instead? Tap to enter them
Enter the details below. The calculator picks whichever gives the higher test pressure.
Step 2: Gauge Reading Target
If your gauge sits higher than the lowest point of the pipework, it reads a bit low. Enter the height difference and we'll tell you exactly what your gauge should show.
Put 0 if your gauge is at the lowest point.
Step 3: Top-Up Water Limit
Only needed for Tests 2, 3 & 4. During a long hold, a small amount of water gets absorbed as trapped air dissolves — this is normal and not a leak. This step works out the most top-up water you're allowed to add.
Show the formula used
Q (L/hr) = 1.4 × 10-7 × L × D × H
This is the AS 2419.1 formula Q = 0.14 × L(km) × D(m) × H(m), rearranged so you can enter length in metres and diameter in millimetres.
Step 4: Test Result & Report Details
Name of person who witnessed the test (optional)
Must be within the last 12 months
⚠️ This gauge's calibration is over 12 months old — not compliant.
Optional — goes on the report
Optional — goes on the report
Adds up automatically from the readings below
Readings at the Test Rig (every 15 minutes)
Write down the gauge pressure and any top-up water added at each 15-minute mark. The rows you need light up for the test you picked; the rest are greyed out.
| Time | Pressure (kPa) | Top-Up Water (litres) |
|---|
+ Also recording pressure at the highest hydrant? Tap to add those readings
Table S.7 asks for a second set of pressure readings taken at the highest (most disadvantaged) hydrant. Fill these in only if you're taking a gauge reading up there — leave blank otherwise.
| Time | Pressure at highest hydrant (kPa) |
|---|
Notes will be included in the PDF report
Entries save automatically on this device and are restored if the page reloads.
Testing Procedure & Acceptance Criteria
📋 Preparation (S.2)
- Ensure the system is fully charged.
- Bleed all trapped air and flush the system to remove debris.
- Ensure all fire hydrant valves are closed.
- Ensure all isolating valves are open within the system or pressure zone.
- Ensure all fire hose reel stop valves are closed (where connected).
🔧 Procedure (S.3)
- Pressurise to 100 kPa above normal static pressure; check for leaks and the functionality of non-return / backflow devices.
- Pressurise to the required test pressure and perform the selected test. Check for leaks and any unacceptable movement of supports or thrust blocks.
- On completion, return the system to normal static pressure and open valves as appropriate.
✅ Acceptance Criteria
- Test 1: No leakage at 1700 kPa at the highest hydrant elevation, held ≥ 30 min.
- Test 2: No leakage at 1700 kPa at the highest hydrant elevation, held ≥ 2 h; make-up water within allowance.
- Test 3: Held ≥ 2 h at the greater of 1700 kPa at booster or 1300 kPa at the worst hydrant; make-up water within allowance.
- Test 4: Held ≥ 2 h at the greater of 1300 kPa at the worst hydrant or 1.25 × max static; make-up water within allowance.
🔬 Test Gauges (S.1)
- Use a minimum of two calibrated pressure gauges and cross-check their readings against each other.
- Minimum 100 mm diameter, range 0–2500 kPa (or less than twice the test pressure if the test pressure exceeds 2500 kPa).
- Current calibration certificate no older than 12 months; gauges must read within ±1% of the full-scale range.
- Monitor the required test pressure at the lowest part of the pipework, or correct the gauge reading by 10 kPa per metre of elevation (Step 2).