VAPOR INTEGRITY TEST--Continued
PRESSURE TEST PROCEDURE
Open emergency valve A (25) and valves D and E (26 and 27). Close valves G and J (28 and
Open control shutoff valve (13) on regulator assembly (12).
Never remove any accessory items (e.g., manhole
cover, cleanout caps) during pressure test; severe injury
or death may result.
Do not overpressure tank. If tank is overpressurized, close
control shutoff valve and open draincock valve to reduce
overpressure. Failure to follow this warning may result in
serious injury to personnel or damage to equipment.
Slowly adjust regulator assembly (12) by turning regulator knob (31) clockwise to increase flow of
air into vapor return line and tank until a pressure reading of 17.5 to 18.5 in. water column (wc) is
obtained on gage (30).
Close control shutoff valve (13) on regulator assembly (12).
Wait 5 minutes to verify that pressure reading remains stable at 17.5 to 18.5 in. wc.
Close draincock valve (20) after tank pressure has dropped to 17.5 to 18.5 in. 0.5 in. wc on
At the end of an additional 5 minutes, record the time and final pressure from gage (30). If
pressure drops more than 0.5 in. wc, repressurize tank per step 3 before connecting.