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Issue Date: November 22, 1995
Revision Date: November 6, 1997
Tank
Automation, Inc.
Automated
Precision Tank Testing System (APTT System) R-2
VOLUMETRIC TANK TIGHTNESS TEST
METHOD (OVERFILL)
| Certification |
Leak rate of 0.1
gph with PD = 99% and PFA = 1%. |
| 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. |
| Tank
Capacity |
Maximum of 15,000
gallons.
Tank must be minimum 100% full. |
| Waiting
Time |
Minimum of 10
hours, 30 minutes between delivery and testing.
Minimum of 2 hours, 30 minutes between "topping off" and
testing.
There must be no dispensing or delivery during waiting time. |
| Test
Period |
Minimum of 1
hour.
Test data are acquired and recorded manually for level measurement and by
system's computer for temperature measurement.
Leak rate is calculated from last 1 hour of test period data.
There must be no dispensing or delivery during test. |
| Temperature |
Average for
product is determined by a minimum of 10 thermistors. |
| Groundwater |
Groundwater
presence must be determined to a depth of 5 feet below grade in tank
excavation backfill.
Product level must be a minimum of 5 feet 6 inches above grade to ensure a
minimum net pressure of 1 psi at bottom of tank during test. |
| Calibration |
Thermistors and
level sensors must be checked annually and, if necessary, calibrated in
accordance with manufacturer's instructions. |
| Comments |
Not evaluated
using manifolded tank systems. |
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Tank
Automation, Inc.
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Evaluator:
Wildwood Engineering
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Manufacturer’s Previously Listed Contact Information is No
Longer Valid.
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Tel:
Unavailable
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Date of
Evaluation: 11/14/90
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