Issue Date: December 5, 2002

Engineering Design Group, Inc.

EDG XLD 2000 Plus (Revision 1.02) Leak Detection System
(MTS DDA Magnetostrictive Probe)


Certification Leak rate is proportional to product surface area (PSA).
For tanks with PSA of 12,074 ft², leak rate is 1.92 gph with PD = 95% and PFA = 5%.
For other tank sizes, leak rate equals [(PSA in ft² ÷ 12,074 ft²) x 1.92 gph].
Example: For a tank with PSA = 1,260 ft²; leak rate = [(1,260 ft² ÷ 12,074 ft²) x 1.92 gph] = 0.2 gph.
Leak rate may not be scaled below 0.2 gph.
Leak Threshold Leak threshold is proportional to product surface area (PSA).
For tanks with PSA of 12,074 ft², leak threshold is 0.96 gph
For other tank sizes, leak threshold equals [(PSA in ft² ÷ 12,074 ft²) x 0.96 gph].
Example: For a tank with PSA = 1,260 ft²; leak threshold = [(1,260 ft² ÷ 12,074 ft²) x 0.96 gph] = 0.1 gph.
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds the calculated leak threshold.
Applicability Gasoline, diesel, aviation fuel, fuel oil #4.
Tank Capacity Use limited to single, field-constructed, vertical-walled tanks having a capacity of 50,000 to 2,100,000 gallons. Minimum product surface area (PSA) is 1260 ft².
Maximum product surface area (PSA) is 12,076 ft².
Performance not sensitive to product level.
Waiting Time Minimum of 30 hours, 18 minutes after delivery or transfer.
Test Period Minimum of 40 hours, 12 minutes.
There must be no delivery, transfer, or dispensing during test.
Temperature Average for product is determined by five resistance temperature detectors (RTDs)
Water Sensor Must be used to detect water ingress.
Minimum detectable water level in the tank is 2.655 inches.
For tanks with a PSA of 12,076 ft² and containing 2.665 inches of water, system takes 52.7 hours to detect a 0.20 gph water ingress rate.
Calibration System must be checked and, if necessary, calibrated in accordance with manufacturer's instructions.
Comments 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. Evaluated in nominal 2,100,000 gallon tank with PSA of 12,076 ft² (124 feet in diameter).
If product temperature change exceeds 1.8 degrees F during test, test will abort.


Engineering Design Group, Inc.

Evaluator:  Ken Wilcox Associates

Manufacturer’s Previously Listed Contact Information is No Longer Valid.

Tel:  (816) 443-2494


Date of Evaluation:  11/16/01


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