Issue Date: April 27, 2006
Revision Date: May 23, 2011

L & J Engineering, Inc.

MCG 1100/MCG 8100
(Magnetostrictive Probe)

Automatic Tank Gauging Method

Certification Leak rate of 0.2 gph with PD = 99.5% and PFA < 0.5%.
Leak Threshold 0.1 gph for leak rate of 0.2 gph.
A tank system should not be declared tight if the test result indicates a loss or gain which equals or exceeds the applicable threshold.
Applicability Gasoline, diesel, aviation fuel, fuel oil #4.
Other liquids with known coefficient of expansion and density may be tested after consultation with the manufacturer.
Tank Capacity Maximum of 15,000 gallons.
Tank must be between 50 and 95% full.
Waiting Time Minimum of 4 hours between delivery and testing.
Test Period Minimum of 5 hours
Test data are acquired by and recorded by system's computer.
There must be no dispensing or delivery during test.
Temperature Average for product is determined by a minimum of 5 resistance temperature detectors (RTD's).
Sensors located above the liquid level are electronically removed from the data analysis.
Water Sensor Must be used to detect water ingress.
Minimum detectable water level in the tank is 1.1 inches.
Minimum detectable water level change is 0.015 inch.
Calibration RTDs 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.

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.
  • L & J Engineering
    5911 Butterfield Road
    Hillside, IL 60162
    Tel: (708) 236-6000
  • Evaluator: Ken Wilcox Associates
    Tel: (816) 443-2494
    Date of Evaluation: September 1, 1992

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