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Issue
Date: September 9, 2003
World Telemetry,
Inc.
Data Link ATGS v2.6-h
(Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
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Certification |
Leak rate of 0.2 gph with PD = 97.2% and
PFA = 2.8% |
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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. |
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Applicability |
Gasoline, diesel, aviation fuel, fuel oil
#4.
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Tank Capacity |
Maximum of 20,000 gallons.
Tanks greater than 90% full may not be tested.
Product level must be at least 2 inches above the lowest temperature sensor.
Minimum product level required is based on tank diameter as follows:
48" dia/min 10.4";
64" dia/min 13";
96" dia/min 18.4";
120" dia/min 22.4";
144" dia/min 26.4".
For other tank diameters, consult manufacturer. |
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Waiting Time |
Minimum of 8 hours between delivery and
testing.
There must be no delivery during waiting time. |
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Test Period |
Minimum of 8 hours.
There must be no dispensing or delivery during test. |
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Temperature |
Average for product is determined by a
magnetostrictive probe containing 5 temperature sensors.
Sensors located above the product surface are not used in data analysis.
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Water Sensor |
Must be used to detect water ingress.
Minimum detectable water level in the tank is 0.81 inch.
Minimum detectable change in water level is 0.011 inch.
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Calibration |
Probe must be checked and, if necessary,
calibrated in accordance with manufacturer’s instructions.
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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.
System consists of a magnetostrictive
probe, a micro processing unit, and a modem that provides a data link to the
home office.
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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World
Telemetry, Inc. |
Evaluator: Ken Wilcox
Associates |
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6914 South Yorktown, Suite
210 |
Tel: (816)
443-2494 |
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Tulsa, OK 74136 |
Date of
Evaluation: 07/31/03 |
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Tel: (918) 494-0672 |
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E-mail:
techsupport@worldtelemetry.com |
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URL:
www.worldtelemetry.com |
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