Issue Date: September 9, 2003

World Telemetry, Inc.

Data Link ATGS v2.6-h (Magnetostrictive Probe)

Automatic Tank Gauging Method

Certification Leak rate of 0.2 gph with PD = 97.2% and PFA = 2.8%
Leak Threshold 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.
Applicability Gasoline, diesel, aviation fuel, fuel oil #4.
Other liquids may be tested after consultation with the manufacturer.
Tank Capacity Maximum of 20,000 gallons.
Tanks greater than 90% full may not be tested.
Product level must be at least 2 inches above the lowest temperature sensor.
Minimum product level required is based on tank diameter as follows:
48" dia/min 10.4";
64" dia/min 13";
96" dia/min 18.4";
120" dia/min 22.4";
144" dia/min 26.4".
For other tank diameters, consult manufacturer.
Waiting Time Minimum of 8 hours between delivery and testing.
There must be no delivery during waiting time.
Test Period Minimum of 8 hours.
There must be no dispensing or delivery during test.
Temperature Average for product is determined by a magnetostrictive probe containing 5 temperature sensors.
Sensors located above the product surface are not used in data analysis.
Water Sensor Must be used to detect water ingress.
Minimum detectable water level in the tank is 0.81 inch.
Minimum detectable change in water level is 0.011 inch.
Calibration 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.
System consists of a magnetostrictive probe, a micro processing unit, and a modem that provides a data link to the home office.
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 system 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.
  • World Telemetry, Inc.
    6655 South Lewis Avenue, Suite 150
    Tulsa, OK 74136
    Tel: (918) 494-0360
    Email: lpgsales@lpgcentral.com
    URL: www.lpgcentral.com
  • Evaluator: Ken Wilcox Associates
    Tel: (816) 443-2494
    Date of Evaluation: 07/31/03

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