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Issue Date: November 22, 1995
Revision Date: November 14, 1997
Engineered
Systems, Inc.
Image II
(Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
| Certification |
Leak
rate of 0.2 gph with PD = 96.6% and PFA = 3.4%. |
| 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. |
| Tank
Capacity |
Maximum
of 15,000 gallons.
Tank must be minimum 90% full. |
| Waiting
Time |
Minimum
of 8 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 average of subsets of all collected
data.
There must be no dispensing or delivery during test. |
| Temperature |
Average
for product is determined by a minimum of 5 resistance temperature
detectors (RTDs). |
| Water
Sensor |
Must
be used to detect water ingress.
Minimum detectable water level in the tank is 0.83 inch.
Minimum detectable water level change is 0.0116 inch. |
| Calibration |
RTDs
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. |
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Engineered
Systems Inc.
|
Evaluator:
Ken Wilcox Associates, Inc.
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2001
W. Campus Dr.
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Tel:
(816) 443-2494
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Tempe,
AZ 85282
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Date
of Evaluation: 08/20/93
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Tel:
(602) 438-1362
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