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
Checked against published worked examples from: USC FCCCHR Manual / AWWA C511.
Details, formula, and sources
ScopeRP relief opens at >= 2 psid and below the #1 check, the #1 check >= 5 psid, and the #2 check tight; DC each check >= 1 psid. Per the USC FCCCHR Manual and AWWA C511.
Formula or tableRP pass: #1 check >= 5 psid AND above the relief opening point, AND relief opens at >= 2 psid, AND #2 check tight >= 1 psid. DC pass: each check holds >= 1 psid tight.
Source and editionUSC FCCCHR Manual of Cross-Connection Control, 10th edition (field test procedures), and AWWA C511, by name.
Free accessUSC FCCCHR / AWWA published; the tester-procedure thresholds are public. The certified tester and water purveyor govern.
What governsEstimate. Operator of record and primacy agency govern.
API field namesassembly_type, check1_psid, relief_open_psid, check2_psi, buffer_psid
- Thresholds RP #1 check >= 5 psid and above the relief opening point (9th edition: 3.0 psid above), relief >= 2 psid; DC checks >= 1 psidUSC FCCCHR Manual 10th ed. / AWWA C511