SPILL – RESISTANT VACUUM BREAKER ASSEMBLY

SVBASVBA

TESTING

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.

PRELIMINARY STEPS

NOTIFY

IDENTIFY

INSPECT

OBSERVE

REMOVE CANOPY

FLUSH TC

FLUSH VENT VALVE

LOOSEN VENT VALVE SCREW UNTIL WATER TRIPS, THEN CLOSE

CONNECT TEST KIT

UNUSED HOSES ARE RAPTED OR REMOVED

CLOSE ALL VALVES

CONNECT TEST KIT

CONNECT TEST KIT

INSTAL COMPENSATING VALVE NO TC # 1

HIGH HOSE TO COMPENSATING VALVE

CONNECT TEST KIT

PURGE

OPEN TC

OPEN HIGH BLEED: FILL AIR INLET VALVE WITH WATER:CLOSE HIGH BLEED WHEN PURGED

PURGE

FILL AIR INLET VALVE

ISOLATE

CLOSE SOV #2

ELEVATE TEST KIT

ISOLATE

CENTER LINE OF TEST GAUGE MUST BE MAINTAINED AT THE SAME LEVEL AS THE VENT VALVE WHILE TESTING CV & INITIAL OPENING POINT OF AIR INLET VALVE

CLOSE SOV #1

ISOLATE

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

OR

PSID MAY OR MAY NOT REDUCE AS FLOW CONTINUES FROM VENT VALVE

SLOWLY OPEN AND VENT VALVE SCREW

CV PSID

CV PSID

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

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

CLOSE TC

RETURN TO SERVICE

CLOSE TC

RETURN TO SERVICE

OPEN SOV #1

RETURN TO SERVICE

OPEN SOV #2

RETURN TO SERVICE

REMOVE VALVE COMPENSATING VALVE

RETURN TO SERVICE

INSTALL CANOPY

RETURN TO SERVICE

RETURN TO SERVICE

“I WILL NOTIFY OWNER, WATER IS BACK ON & ASSEMBLY PASSED”.

IN CLASS……..

“I’M DONE TESTING THIS ASSEMBLY”

“I WILL CORRECTLY FILL OUT TEST REPORT”

SPILL- RESISTANT VACCUM BREAKER (SVBA)

FAILED TO OPEN

AIR INLET OPENED 1.8 PSID

CONTINUED TO OPEN FULLY X YES NO

CHECK VALVE PASSED 5.2 PSID

FAILED

PASSED TEST x YES NO

REMARKS: