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Issue Date: November 22, 1995
Revision Date: March 10, 2000
Andover Controls Corp.
Andover Infinity
Versions
CX9000, CX9200, CMX240
(Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
| Certification |
Leak rate of 0.2 gph with PD = 99.9% and
PFA < 0.1%.
Leak rate of 0.1 gph with PD = 97.6% and PFA = 2.4%. |
| Leak
Threshold |
0.1 gph for leak rate of 0.2 gph.
0.05 gph
for leak rate of 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.
|
| Tank
Capacity |
Maximum of 15,000 gallons.
Tank must be between 50 and 95% full. |
| Waiting
Time |
Minimum of 6 hours between delivery and
testing.
Minimum of 3 hours between dispensing and testing.
There must be no delivery during waiting time. |
| Test
Period |
Minimum of 6 hours.
Test data are acquired and recorded by system's computer.
Leak rate is calculated as the average of subsets of all data
collected.
There must be no dispensing or delivery during test. |
| Temperature |
Average for product is determined by a
minimum of 3 resistance temperature detectors (RTDs). |
| Water
Sensor |
Must be used to detect water ingress.
Minimum detectable water level in the tank is 0.35 inch.
Minimum detectable change in water level is 0.003 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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Andover
Controls Corp.
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Evaluator:
Ken Wilcox Associates
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300
Brickstone Square
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Tel:
(816) 443-2494
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Andover,
MA 01810
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Date
of Evaluation: 05/24/93
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Tel:
(978) 470-0555
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