Issue Date: November 22, 1995
Revision Date: July 23, 2003

Phoenix Technologies Division of Phoenix Group

(originally listed as Arizona Instrument Corp. and NESCO)

Encompass USF IPAM #17-901
(Ultrasonic Probe #17-9100)

Automatic Tank Gauging Method

Certification Leak rate of 0.2 gph with PD = 99.94% and PFA = 2.06%.
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 with known coefficients 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 3 hours between delivery and testing.
There must be no dispensing or delivery during waiting time.
Test Period Minimum of 6 hours.
Test data are acquired and recorded by system's computer.
Leak rate is calculated from data determined to be valid by statistical analysis.
There must be no dispensing or delivery during test.
Temperature Average for product is obtained by a single temperature sensor that measures change in ultrasonic wave velocity.
Water Sensor Must be used to detect water ingress.
Minimum detectable water level in the tank is 1.86 inches.
Minimum detectable change in water level is 0.012 inch.
Calibration Temperature sensor 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.
Encompass software provides for remote access capabilities.

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.
  • Phoenix Technologies Division of Phoenix Group
    2125 South 48th Street, Suite 106
    Tempe, AZ 85282
    Tel: (877) 890-3808
  • Evaluator: Ken Wilcox Associates
    Tel: (816) 443-2494
    Date of Evaluation: 08/22/94

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