SPILL – RESISTANT VACUUM BREAKER ASSEMBLY SVBA TESTIN G
Review of Backflow Prevention Assembly Test Procedures and Diagnostics These procedures are intended as a review of basic test procedures and diagnostics intended for trained and experienced BAT testers. These procedures are used in many areas of the U.S. and Canada. The enclosed test procedures are not intended as a replacement for Approved Backflow Assembly Tester Education and/or Backflow Assembly Tester Certification, as required in many areas.
SPILL- RESISTANT VACCUM BREAKER FAILED TO OPEN AIR INLET OPENED 1.0 PSID or Greater PSID CONTINUED TO OPEN FULLY X YES NO CHECK VALVE PASSED 1.0 PSID or Greater PSID FAILED PASSED TEST x YES NO REMARKS:
EXAMPLES OF REQUIRED PRELIMINARIES IDENTIFY INSPECT OBSERVE - Obtain permission to turn water off to test assembly including and estimated time water will be off. Fire sprinkler systems require additional notifications. NOTIFY - Verify make, model, size and serial number to insure the correct assembly the is being tested. - Assembly shall be installed correctly and listed on the current “Assembly Approved List” - General condition of assembly, direction of flow, shut off valves and test cocks properly located and usable.
CV TEST REDUCE PRESSURE TO ATMOSHERIC DOWNSTREAM OF CV EXPECTATIONS?? PSID REDUCES, FLOW FROM VENT VALVE CEASES AND GAUGE STABILIZES, PSID ACROSS CV SHALL BE 1.0 PSID OR GREATER O WHEN PSID REDUCES, FLOW FROM VENT VALVE CEASES, CV DOES NOT HOLD 1.0 PSID OR PSID MAY OR MAY NOT REDUCE AS FLOW CONTINUES FROM VENT VALVE
O REMOVE VENT VALVE SCREW TEST KIT MUST REMAIN ELEVATED
VENT SCREW TEST KIT REMAINS ELEVATED WHEN FLOW CEASES FROM VENT VALVE & GAUGE STABILIZES; CV SHALL HOLD TIGHT AT 1.0 PSID OR GREATER (RECORD CV PSID LATER WHEN GAUGE IN LOWERED).
INITIAL OPENING POINT REDUCE WATER PRESSURE IN BODY EXPECTIONS? AIR INLET VALVE SHALL INITIALLY OPEN AT OR GREATER THAN 1.0 PSID AIR INLET VALVE DOES NOT OPEN OR AIR INLET OPENS BELOW 1.0 PSID OR AIR INLET TEST
STEP 1: AIR INLET VALVE INITIAL OPENING POINT 1. REDUCE PSID BY SLOWLY OPENING HIGH BLEED MAXIMUN OF ¼ TURN. TEST KIT REMAINS ELEVATED
WATER ON TOP OF AIR INLET VALVE WILL SUDDENDLY DROP OR FLOW FROM VENT VALVE AT INITIAL OPENING POINT O AIR INLET VALVE OPENING PSID initial opening point 2. OBSERV PSID REDUCE SLOWLY TO THE INITIAL OPENING POINT OF THE AIR INLET VALVE. 4. RECORD INITIAL PSID PENING POINT 3. LOWER TEST KIT
SPILL- RESISTANT VACCUM BREAKER FAILED TO OPEN AIR INLET OPENED 1.8 PSID CONTINUED TO OPEN FULLY YES NO CHECK VALVE PASSED 4.2 PSID FAILED PASSED TEST YES NO REMARKS: 5) RECORD CV PSID (4.2) AND AIR INLET INITIAL OPENING PSID (2.0 PSI)
EXPECTIONS? OBSERVE AIR INLET VALVE CONTINUES TO OPEN FULLY AIR INLET VALVE DOES NOT CONTINUE TO OPEN FULLY OR STEP 2: OBSERVE AIR INLET CONTINUES TO OPEN FULLY
1. CLOSE HI BLEED VALVE (TEST GAUGE) ONCE CV PSID VALUE AND INITIAL OPENING POINT OPENING OF THE AIR INLET VALVE IS RECORED……… AIR INLET VALVE CONTINUES TO FULLY OPEN
2. REMOVE HI BLEED HOSE FROM COMPENSATING VALVE TO ALLOW WATER TO DRAIN FROM THE SVBA BODY.
AIR INLET VALVE CONTINUES TO FULLY OPEN 3. WHEN THIS FLOW OF WATER STOPS, OBSERVE AIR INLET VALVE CONTINUES TO FULLY OPENED. OBSERVE AIR INLET FULLY OPENED REPORT AND RECORD AIR INLET CONTINUED TO FULLY OPEN.
SPILL- RESISTANT VACCUM BREAKER FAILED TO OPEN AIR INLET OPENED 1.8 PSID CONTINUED TO OPEN FULLY X YES NO CHECK VALVE PASSED 4.2 PSID FAILED PASSED TEST YES NO REMARKS:
INSTALL VENT VALVE SCREW RETURN TO SERVICE CLOSE CV #1