Backflow Assembly Test Pass Criteria
Pass/fail per assembly type with the governing field-test criterion.
Example
You enter
- Assembly type rp
- Check #1 differential (psid) 8
- RP relief opening point (psid) 4
- Check #2 tightness (psi) 3
You get
- Buffer (psid) 4
Details, formula, and sources
RP relief opens >= 2 psid below the #1 check and the #1 check >= 5 psid; DC each check >= 1 psid. Per the USC FCCCHR Manual and AWWA C511.
RP pass: #1 check >= 5 psid AND relief opens >= 2 psid below the #1 check. DC pass: each check holds >= 1 psid tight.
USC FCCCHR Manual of Cross-Connection Control and AWWA C511 field-test procedure, by name.
USC FCCCHR / AWWA published; the tester-procedure thresholds are public. The certified tester and water purveyor govern.
Estimate. Operator of record and primacy agency govern.
Field names used by the API: assembly_type, check1_psid, relief_open_psid, check2_psi, buffer_psid
- Thresholds RP relief >= 2 psid below #1 check and #1 check >= 5 psid; DC checks >= 1 psidUSC FCCCHR Manual / AWWA C511