Issue Date: November 22, 1995
Revision Date: October 18, 2002

OPW Fuel Management Systems

(originally listed as Emco Electronics, Tuthill Transfer Systems)

EECO System 1000, 1500, 2000, 3000 and Galaxy 0.2 gph Precision Test and Quick Test
(Q0400-4xx Magnetostrictive Probe)

Automatic Tank Gauging Method

Certification Leak rate of 0.2 gph with PD = 99.1% and PFA = 0.9% for Precision Test. Leak rate of 0.2 gph with PD = 95.4% and PFA = 4.6% for Quick 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, 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 based on tank diameter as follows:
48" dia/min 8.5";
64" dia/min 10.5";
72" dia/min 11.5";
96" dia/min 14";
126" dia/min 18".
For other tank diameters, see evaluation report.
Waiting Time Between delivery and testing ranges from 1 to 6 hours depending on tank conditions.
None between dispensing and testing.
There must be no delivery during waiting time.
Test Period Average of 2 hours, 46 minutes during Precision Test evaluation.
Average of 1 hour, 9 minutes during Quick Test evaluation.
Test data are acquired and recorded by a microprocessor which automatically determines test time based on tank size and product level.
There must be no dispensing or delivery during test.
Temperature Probe contains 5 resistance temperature detectors (RTDs) to monitor average product temperature.
At least one RTD must be submerged in product during test.
Water Sensor Must be used to detect water ingress.
Minimum detectable water level in the tank is 0.66 inches.
Minimum detectable change in water level is 0.039 inches.
Calibration RTDs and probe must be checked regularly 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 the 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.
  • OPW Fuel Management Systems
    6900 Santa Fe Dr.
    Hodgkins, IL 60525
    Tel: (708) 485-4200
    URL: www.opwglobal.com/opw-fms
  • Evaluator: Ken Wilcox Associates
    Tel: (816) 443-2494
    Dates of Evaluation: 12/23/93, 06/20/94, 08/17/95, 07/28/97, 11/17/99

Home |  Vendors: A–F |  Vendors: G–M |  Vendors: N–S |  Vendors: T–Z |  Method Index

Appearance on this list is not to be construed as an endorsement by any regulatory agency nor is it any guarantee of the performance of the method or equipment. Equipment should be installed and operated in accordance with all applicable laws and regulations. For full details, please refer to our expanded DISCLAIMER page.