VAPOR INTEGRITY TEST--Continued
VACUUM TEST PROCEDURE
Open valves (26 and 27) and emergency valve A (25). Close G valve (28) and manifold drain
Open control shutoff valve (13) on regulator assembly (12).
Never remove any accessory items (e.g., manhole cover,
cleanout caps) during pressure or vacuum test; severe
injury or death may result.
Slowly adjust regulator assembly (12) by turning regulator knob (31) counterclockwise to increase
flow of air and evacuate tank and piping system, until a vacuum reading of 6.0 in. 0.5 in. wc is
obtained on gage (35).
Close control shutoff valve (13) on regulator assembly (12).
Wait 5 minutes to verify that pressure reading remains stable at 6.0 in. 0.5 in. wc on gage (35).
If vacuum reading increases or decreases more than 0.5 in. wc on gage (35), reevacuate tank
per steps 3 thru 5 and continue with step 7. Initial test vacuum must be at 6.0 in. 0.5 in. wc.
Do not overpressurize tank; serious injury or equipment
damage may result.