Certification

Leak rate of 0.2 gph with PD > 95% and PFA < 0.001%.

Leak Threshold

0.17 gph for single tanks at 95% PD.
0.155 gph for manifolded tank systems at 95% PD.
0.16 gph for single tanks at 99% PD.
0.135 gph for manifolded tank systems at 99% PD.
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, fuel oil #4, biodiesel blends B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751.

Tank Capacity

Maximum of 32,891 gallons for single tanks and for all tanks manifolded together.

Throughput

Monthly maximum of 445,408 gallons.

Waiting Time

None. The algorithm tests the data for stability and discards those before the tank is stable.

Test Period

Data collection time ranges from 5 to 26 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 thermistors.

Water Sensor

Must be used to detect water ingress.
Minimum detectable water level in the tank is 0.208 inch (0.44 inch using model TSP-IGF4P).
Minimum detectable change in water level is 0.011 inch (0.013 inch using model TSP-IGF4P).

Calibration

Thermistors and probe must be checked and, if necessary, calibrated in accordance with manufacturer's instructions.

Comments

The user configuring the system can select between 99% and 95% PD modes. System reports a result of "pass" or "fail."
Evaluated using both single and manifolded tank systems with probes in each tank. Constant and variable leaks were mathematically induced into tight tank test records which were collected by systems installed at various active tank sites.
The database for evaluation of the system included sites with vapor recovery and blending dispensers.
Tanks used in this evaluation contained gasoline and diesel.
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.
Tests only the portion of the tank containing product.
System considers tank to be stable when net product volume change rate is less than 19.8 gph / 0.3302 gpm.
System distinguishes large leak rates (between 1 gph and 10 gph) from dispensing activities and reports those as “fail”.
As product level is lowered, the 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.
Data from periods when the tank volume is below 14% of maximum are not used for leak detection.

Franklin Fueling Systems

Evaluator:  Ken Wilcox Associates

3760 Marsh Road

Tel:  (816) 443-2494

Madison, WI  53718

Dates of Evaluations: 09/14/15

Tel:  (800) 225-9787

URL:  www.franklinfueling.com