Backflow Prevention › Test Results
Backflow Prevention Test Results Calculator
Enter field test readings to check pass/fail against AS/NZS 2845.1 criteria for RP assemblies, DCV and PVB devices.
Backflow Device Test Pass/Fail Reference
Enter differential pressure readings to check compliance.
Minimum DPs per AS/NZS 2845.1. RP: CV1 ≥ 34 kPa, RV < 13.8 kPa, CV2 ≥ 14 kPa. DCV: both CVs ≥ 14 kPa. This is a reference aid — always record results on the official test form.
Frequently Asked Questions
What are the RP assembly pass criteria?
CV1 ≥ 34 kPa, Relief Valve opens at < 13.8 kPa below CV1 differential, CV2 ≥ 14 kPa. Failing any component fails the assembly.
How often must backflow preventers be tested?
NZS 4503 recommends annual testing for most assemblies. High-hazard sites (hospitals, chemical plants) may require more frequent inspection per the Territorial Authority.
Can a failed assembly be repaired on site?
Yes — many assemblies can be repaired on site by replacing worn seats, discs or springs using manufacturer-approved kits, then re-tested to confirm passing readings before certifying.
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