Issue Date: June 19, 1996
Revision Date: May 25, 2001

OMNTEC Mfg., Inc.

OEL 8000, K-OEL 8000
(MTG - XX Magnetostrictive Probe, 4 inch dia Floats)

Automatic Tank Gauging Method

Certification Leak rate of 0.1 gph with PD = 97.8% and PFA = 2.2%.
Leak Threshold 0.05 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.
Tanks less than 95% full may be tested.
Minimum product level required is based on tank diameter as follows:
48" dia/ min 12";
64" dia/ min 15";
72" dia/ min 16";
96" dia/ min 20";
126" dia/ min 25";
132" dia/ min 26".
For other tank diameters, consult manufacturer.
Waiting Time Minimum of 6 hours, 30 minutes between delivery and testing.
There must be no delivery during waiting time.
Test Period Minimum of 4 hours.
Test data are acquired and recorded by the controller.
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 determined by a probe containing a minimum of 5 thermistors.
At least one thermistor must be submerged in product during test.
Water Sensor Must be used to detect water ingress.
Minimum detectable water level in the tank is 0.055 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.
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.

If the 0.1 gph test is used as a tank tightness test there must be no water present in the backfill (groundwater must be below the bottom of the tank), the tank must be equipped with an overfill protection device, and the product level in the tank must be at the overfill protection device set point. Local agency pre-approval is required. To use the 0.1 gph test as a monthly option see title 23 CCR Section 2643 (b)(2).
  • OMNTEC Mfg., Inc.
    1993 Pond Rd.
    Ronkonkoma, NY 11779
    Tel: (631) 981-2001
    Email: omntec@omntec.com
    Website: www.omntec.com
  • Evaluator: Ken Wilcox Associates
    Tel: (816) 443-2494
    Dates of Evaluation: 01/17/96, 09/15/97

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