Issue Date: July 14, 2003

Dresser Wayne Europe

TIG 1000
(Model 924, 2 inch dia Floats, Magnetostrictive Probe)

Automatic Tank Gauging Method

Certification Leak rate of 0.2 gph with PD = 97.8% and PFA = 2.2% for 30 minute test.
Leak rate of 0.2 gph with PD = 99.4% and PFA = 0.6% for 1 hour test.
Leak rate of 0.2 gph with PD = 99.7% and PFA = 0.3% for 2 hour test.
Leak rate of 0.2 gph with PD = 99.9% and PFA = 0.1% for 3 hour test.
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.
Other liquids with known coefficients of expansion and density may be tested after consultation with the manufacturer.
Tank Capacity Maximum of 20,000 gallons.
Tank must be minimum 50% full for 1 hour test.
Tank must be minimum 14% full for 30 minute, 2 hour and 3 hour test.
Minimum product level required based on 14% full tank and tank diameter is as follows:
48" dia/min 9.5";
120" dia/min 24.7".
For other tank diameters, consult manufacturer.
Waiting Time Minimum of 8 hours between delivery and testing.
There must be no delivery during waiting time.
Minimum of 30 minutes between dispensing and testing.
Test Period Variable:
Minimum of 30 minutes, 1, 2 or 3 hours.
Test data are acquired and recorded by system's computer.
Leak rate is calculated as 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 a probe containing 5 thermistors with the lowest thermistor located at the 10% tank volume level above the bottom of the tank.
Water Sensor Must be used to detect water ingress.
Minimum detectable water level in the tank is 0.75 inch.
Minimum detectable change in water level is 0.08 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 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.
  • Dresser Wayne AB
    Limhamnsvagen 109, Box 30049
    SE-200 61 Malmo, Sweden
  • Evaluator: Ken Wilcox Associates
    Tel: (816) 443-2494
    Dates of Evaluation: 11/06/00

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