Specifications

TM9-2330-384-14&P
5-8. VAPORINTEGRITYTEST(Con't).
WARNING
Donotoverpressurizetank;seriousinjurytopersonnelordamageto equipmentmay
result.
(4)
If tank is overpressurized, close shutoff valve (116)and open draincock valve (20) to reduce tank pressure.
Once tank pressure has dropped to 6.0 inches ± 0.5 inch wc, close draincock valve (20).
(5)
Close vapor vent valve (30) using lower lever located in roadside cabinet.
(6)
It vacuum in vapor vent line remains at 6.0 inches ± 0.5 inch wc, go to step 10. If pressure drops, go to step
7.
(7)
Visually locate the leak in vapor return line (check vapor vent hood, vapor vent hose, and pipe joints).
(8)
Return tank and piping system to atmospheric pressure by opening rear sump drain (2) and vapor vent valve
(30).
2
(9)
Repair leak in vapor return line (para 4-78), and verify repair by testing per step 2.
(10)
Close vapor vent valve (30) and return vapor vent line to atmospheric pressure by opening draincock valve
(20).
(11)
Close draincock valve (20) and monitor pressure gage for vacuum increases.
(12)
If vapor vent line vacuum shows no increase, go to step 15. If a decrease in vacuum is detected, go to step
13.
(13)
Return tank and piping to atmospheric pressure by opening rear sump drain (2) and vapor vent valve (30).
(14)
Repair vapor vent valve (30) (para 4-78), and verify repair by testing per step 2.
(15)
Open vapor vent valve (30) and reevacuate tank, if necessary, bringing vacuum to 6.0 inches ± 0.5 inch wc,
per step 2.
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