Issue Date: September 11, 1998
Revision Date: March 1, 2011


TLS-250, 250i, 300, 300C, 300i, 300PC, 350, 350PC, 350R, 350RPC, 350Plus, 450
Red Jacket ProMax and ProPlus UST ATGS
(Models 8473, 8493 Magnetostrictive Probes)


Certification Leak rate of 0.2 gph with PD = 98.9% and PFA = 0.3%.
Leak rate of 0.1 gph with PD = 95.8% and PFA = 0.9%.
Leak Threshold 0.126 gph for leak rate of 0.2 gph.
0.071 gph for leak rate of 0.1 gph.
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold.

Gasoline, diesel, aviation fuel, biodiesel blends B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751.

Tank Capacity Maximum of 15,000 gallons.
Tanks less than 95% full may be tested. Minimum product level required is based on tank diameter as follows:
48" dia/ min 18";
64" dia/ min 21";
72" dia/ min 24";
96" dia/ min 30";
126" dia/ min 39".
For other tank diameters, see evaluation report.
Waiting Time Minimum of 8 hours between delivery and testing. Minimum of 30 minutes between dispensing and testing.
There must be no delivery during waiting time.
Test Period Minimum of 2 hours for leak rate of 0.2 gph.
Minimum of 3 hours for leak rate of 0.1 gph.
Test data are acquired and recorded by system's computer. Leak rate is calculated from the difference between the first and last data collected.
There must be no dispensing or delivery during test.
Temperature Average for product is determined by probe which contains 5 thermistors.
At least one thermistor must be submerged in product during test.
Water Sensor Must be used to detect water ingress.
Minimum detectable water level in the tank is 0.544 inch.
System is programmed to report water depth only when it exceeds 0.75 inch.
Minimum detectable change in water level is 0.027 inch.
Calibration Thermistors and probe must be checked and, if necessary, calibrated in accordance with manufacturer's instructions.
Comments 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 which routinely contains product.



Evaluator:  Midwest Research Institute

125 Powder Forest Dr.

Tel:  (816) 753-7600

Simsbury, CT 06070-7684

Dates of Evaluations:  09/04/97, 07/01/98

Tel:  (860) 651-2700

Evaluator: Ken Wilcox Associates


Tel:  (816) 443-2494


Date of Evaluation: 02/29/08

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