spill – resistant vacuum breaker assembly
DESCRIPTION
SPILL – RESISTANT VACUUM BREAKER ASSEMBLY. SVBA. TESTING. Review of Backflow Prevention Assembly Test Procedures and Diagnostics. These procedures are used in many areas of the U.S. and Canada. - PowerPoint PPT PresentationTRANSCRIPT
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: