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Backflow Testing Calculator

Enter test readings to determine pass/fail per ASSE standards

RPZ Test Readings

Must hold at 1.0 PSID min
Must hold at 1.0 PSID min
Must open at 2.0 PSID min (below CV#1)

System Pressure

Test Results

Overall Result --
Check Valve #1 --
Check Valve #2 --
Relief Valve --
Pressure Drop --
Assembly Standard --
Test result details will appear here.

Minimum Test Requirements

Assembly Component Min. Requirement
RPZCheck #11.0 PSID
Check #21.0 PSID
Relief Valve2.0 PSID below CV#1
DCCheck #11.0 PSID
Check #21.0 PSID
PVB/SVBAir Inlet1.0 PSIG opening
Check Valve1.0 PSID

Testing Standards & Procedures

RPZ (ASSE 1013)

  1. Close #2 shutoff, open test cocks
  2. Record CV#1 reading
  3. Open #2 shutoff slowly
  4. Record RV opening point
  5. Close #1 shutoff
  6. Record CV#2 reading

DC (ASSE 1015)

  1. Close #2 shutoff
  2. Bleed to atmosphere
  3. Record CV#1 reading
  4. Close #1 shutoff
  5. Open #2 shutoff
  6. Record CV#2 reading

PVB (ASSE 1020)

  1. Close downstream shutoff
  2. Open test cock
  3. Record air inlet opening
  4. Close test cock
  5. Attach gauge to body
  6. Record CV reading

Frequency

  • Initial: At installation
  • Routine: Annual minimum
  • After repair: Immediate
  • Records: Keep 5+ years