Certification
|
Leak
rate of 0.2 gph with PD = 99.1% and PFA = 0.9%.
|
Leak
Threshold
|
0.1
gph for single and manifolded tank systems.
A tank system should not be declared tight and a message
printed for the operator, if the test results indicate
a loss or gain that exceeds this threshold.
|
Applicability
|
Gasoline,
diesel, aviation fuel.
The system is designed primarily for use with petroleum
fuels.
Other liquids with known coefficients of expansion and
density may be tested after consultation with the manufacturer.
|
Tank
Capacity
|
Maximum
of 35,000 gallons for single tanks and for up to 2 tanks
manifolded together.
|
Throughput
|
Monthly
maximum of 130,000 gallons.
|
Waiting
Time
|
Minimum
of 6 hours stabilization time is allowed between delivery
and data collection.
|
Test
Period
|
Average
data collection time is 12 days.
During evaluation, data collection time ranged from 1
to 31 days.
Data sampling frequency is at least once per minute.
System collects data at naturally occurring product levels
without interfering with normal tank operation and discards
data from unstable periods when system performs test.
|
Temperature
|
Average
for product is determined by a minimum of 5 sensors.
|
Water
Sensor
|
Must
be used to detect water ingress.
Minimum detectable water level in the tank is 0.66 inch.
Minimum detectable change in water level is 0.039 inch.
|
Calibration
|
Temperature
sensors are factory calibrated.
Probe must be checked and, if necessary, calibrated in
accordance with manufacturer's instructions.
|
Comments
|
System reports a result of
"pass" or "fail."Evaluated using both
single and manifolded tank systems with probes in each
tank. Data can be collected when the product level is
between 9% and 94.9% of tank volume. System distinguishes
large leak rates (> 1gph) from dispensing activities
and reports those as "fail". For valid monthly
testing, a conclusive test report must be produced for
each tank every month. System warns operator if there
are no "passing" tests completed during the
month. For very active tanks, a tank shut down may become
necessary in order for the system to collect enough quiet-time
data for a test. The 6-hour stabilization period after
delivery may result in the system not testing the top
portion of a very active tank. In this situation, a periodic
test in the shut-down mode with a high product level should
be used to test the entire portion of tank that routinely
contains product. Because the database for evaluation
of the system did not include sites with vapor recovery,
certification is limited to sites with no vapor recovery.Evaluated
using gasoline.
|