Certification
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Leak
rate of 0.2 gph with PD = 97.3% and PFA = 2.7%
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Leak
Threshold
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0.1
gph.
A tank system should not be declared tight if the test
result indicates a loss that equals or exceeds this threshold.
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Applicability
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Gasoline,
diesel, aviation fuel, fuel oil #4.
Other liquids with known coefficients of expansion and
density may be tested after consultation with the manufacturer.
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Tank
Capacity
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Maximum
of 75,000 gallons. Tank must be between 50 and 95% full.
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Waiting
Time
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Minimum
of 8 hours between delivery and testing.
Minimum of 5 minutes between dispensing and testing.
There must be no delivery during waiting time.
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Test
Period
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Minimum
of 8 hours.
Test data are acquired and recorded by system's computer.
Leak rate is calculated from data determined to be valid
by statistical analysis.
There must be no dispensing or delivery during test.
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Temperature
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Average
for product is determined by probe which contains 5 thermistors.
At least one thermistor must be submerged in product during
test.
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Water
Sensor
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Must
be used to detect water ingress.
Minimum detectable water level in the tank is 0.488 inch.
Minimum detectable change in water level is 0.124 inch.
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Calibration
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Thermistors
and probe must be checked and, if necessary, calibrated
in accordance with manufacturer's instructions.
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Comments
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Not
evaluated using manifolded tank systems. Therefore,
this certification is only applicable when there is
a probe used in each tank and the siphon is broken during
testing.
Tests only portion of tank containing product.
As product level is lowered, leak rate in a leaking
tank decreases (due to lower head pressure).
Consistent testing at low levels could allow a leak
to remain undetected.
EPA leak detection regulations require testing of the
portion of the tank system which routinely contains
product.
TMS 2000 and TMS 3000 controller are identical except
that the TMS 3000 console has more input contacts.
The TMS 2000 can monitor up to 2 probes and 8 leak sensors
while the TMS 3000 can monitor up to 12 probes and 40
leak sensors.
California regulations require at
least one test per month after routine product delivery
or when the tank is filled to within 10% of the highest
operating level of previous month.
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