Question: how to test pvb backflow?
Answer: CLOSE TESTCOCK 2.
REMOVE HIGH HOSE FROM TESTCOCK 2.
OPEN INLET SHUTOFF VALVE.
ATTACH COMPENSATING (BLEED-OFF) TEE TO TESTCOCK 1.
ATTACH HIGH HOSE TO BLEED-OFF TEE on TESTCOCK 1.
OPEN TESTCOCK 1 SLOWLY.
OPEN HIGH BLEED - BLEED AIR FROM GAUGE.