8601 Series/TLS4 Series Consoles
(Model 8463 Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
Certification
Leak rate of 0.2 gph with PD = 97.1% and PFA = 0.1%.
Leak rate of 0.1 gph with PD = 95% and PFA = 0.4%.
Leak
Threshold
0.126 gph for leak rate of 0.2 gph.
0.063 gph for leak rate of 0.1gph.
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, biodiesel blends B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751*.
Other liquids with known coefficients of expansion and density may be tested after consultation with the manufacturer.
*NWGLDE Listings apply to leak detection functionality only and not material compatibility - see “Disclaimer”.
Tank Capacity
Maximum of 30,000 gallons for leak rate of 0.2 gph.
Maximum of 20,000 gallons for leak rate of 0.1 gph.
Tank product level required to conduct test must be 50% or more.
Waiting
Time
Minimum of 8 hours between delivery and testing.
Minimum of 30 minutes between dispensing and testing.
There must be no dispensing or delivery during test.
Test
Period
Minimum of 3 hours
Test data are acquired and recorded by system’s computer (microprocessor).
Leak rate is calculated from 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 which contains 5 thermistors.
At least two thermistors must be submerged in product during test.
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, for manifolded tank systems, 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 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.
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.
