UST Installation Testing Requirements
And Cathodic Coatings Questions And
Answers With Verified Solutions 100%
Correct!!!
Preinstallation Single-walled tank Testing (Sec. 3.2)
(Before placing components in Excavation) - ANSWER✔✔ Visual Inspection for
damage or holes
3 to 5 psig air/soap test
3 psig for 12 ft diameter or greater tanks
According to manufacturer's instructions
Single-walled storage tank Testing
Before Placing the System in Service - ANSWER✔✔ Tightness-test tank and
piping
Preinstallation Double-walled tank testing (Sec 3.3, 3.5-7)
(Before placing components in Excavation) - ANSWER✔✔ Inspection
Max of 5 psig air/soap test for one hour
-Seal inner tank and disconnect external air supply
-Pressurize interstice with air from the inner tank, measure interstice pressure with
a third gauge
-Soap and watch for bubbles or drop of pressure on the gauges
-First release pressure in interstice, then primary tank
, Preinstallation Double-walled Tank with liquid-filled interstice Testing -
ANSWER✔✔ Carefully inspect interior and exterior surfaces of tank for signs of
leakage.
Check level of liquid in the interstice reservoir
Preinstallation Double-walled Tank with Vacuum on interstice Testing -
ANSWER✔✔ Check to make sure the vacuum level in the interstice is within the
limits designated by the manufacturer
Double-walled storage tank Testing (Sec 3.6-7)
Before Placing the System in Service - ANSWER✔✔ Inspect tank interstice or
check vacuum or liquid level
Preinstallation Testing of Compartmented Tanks
Single-walled bulkheads - ANSWER✔✔ Test compartments on different sides of
the same bulkhead at different times
Preinstallation Testing of Compartmented Tanks
Double-walled bulkheads - ANSWER✔✔ Compartments may be tested at the
same time
Tank deflection Inspection (Sec 5.9)
After Assembly but before Backfilling - ANSWER✔✔ Measure tank diameter
before and after installing anchor straps.
Acceptable deflection is established by the manufactorer
Tank shell deflection Testing
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