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Issue
Date: June 19, 1996
Revision Date: May 25, 2001
OMNTEC
Mfg., Inc.
OEL
8000, K-OEL 8000
(MTG - XX Magnetostrictive Probe, 4 inch dia Floats)
AUTOMATIC
TANK GAUGING METHOD
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Certification
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Leak
rate of 0.1 gph with PD = 97.8% and PFA = 2.2%.
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Leak
Threshold
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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.
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Applicability
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Gasoline,
diesel, aviation fuel, fuel oil #4.
Other liquids with known coefficients of expansion and
density may be tested after consultation with the manufacturer.
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Tank
Capacity
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Maximum
of 15,000 gallons.
Tanks less than 95% full may be tested.
Minimum product level required is based on tank diameter
as follows:
48" dia/ min 12";
64" dia/ min 15";
72" dia/ min 16";
96" dia/ min 20";
126" dia/ min 25";
132" dia/ min 26".
For other tank diameters, consult manufacturer.
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Waiting
Time
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Minimum
of 6 hours, 30 minutes between delivery and testing.
There must be no delivery during waiting time.
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Test
Period
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Minimum
of 4 hours.
Test data are acquired and recorded by the controller.
Leak rate is calculated from data determined to be valid
by statistical analysis.
There must be no dispensing or delivery during test.
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Temperature
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Average
for product is determined by a probe containing a minimum
of 5 thermistors.
At least one thermistor must be submerged in product during
test.
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Water
Sensor
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Must
be used to detect water ingress.
Minimum detectable water level in the tank is 0.055 inch.
Minimum detectable change in water level is 0.011 inch.
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Calibration
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Probe
must be checked and, if necessary, calibrated in accordance
with manufacturer's instructions.
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Comments
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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.
If the 0.1 gph test
is used as a tank tightness test there must be no water
present in the backfill (groundwater must be below the
bottom of the tank), the tank must be equipped with
an overfill protection device, and the product level
in the tank must be at the overfill protection device
set point. Local agency pre-approval is required. To
use the 0.1 gph test as a monthly option see title 23
CCR Section 2643 (b)(2).
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OMNTEC
Mfg., Inc.
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Evaluator: Ken Wilcox Associates
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1993
Pond Rd.
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Tel: (816) 443-2494
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Ronkonkoma,
NY 11779
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Dates
of Evaluation: 01/17/96,
09/15/97
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Tel: (631) 981-2001
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