Issue
Date: November 22, 1995
Revision Date: October 18, 2002
OPW
Fuel Management Systems
(originally listed as Emco Electronics, Tuthill
Transfer Systems)
EECO
System 1000, 1500, 2000, 3000 and Galaxy 0.1 gph Precision
Test and Quick Test
(Q0400-4xx Magnetostrictive Probe)
AUTOMATIC
TANK GAUGING METHOD
Certification
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Leak rate of 0.1 gph with
PD = 99% and PFA = 1% for Precision Test.
Leak rate of 0.1 gph with PD = 96% and PFA = 4% for
Quick Test.
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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 which 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 based on tank diameter as follows:
48" dia/min 8.5";
64" dia/min 10.5";
72" dia/min 11.5";
96" dia/min 14";
126" dia/min 18".
For other tank diameters, see evaluation report.
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Waiting
Time
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Minimum of 6 hours between
delivery and testing.
None between dispensing and testing.
There must be no delivery during waiting time.
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Test
Period
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Minimum of 3 hours, 45
minutes for Precision Test.
Average of 3 hours 45 minutes at 95% full and 5 hours
58 minutes at 50% full during Precision Test evaluation.
Minimum of 1 hour, 49 minutes for Quick Test.
Average of 1 hour 48 minutes at 95% full and 2 hours
48 minutes at 50% full during Quick Test evaluation.
Test data are acquired and recorded by a microprocessor
which automatically determines test time based on tank
size and product level.
There must be no dispensing or delivery during test.
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Temperature
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Probe contains 5 resistance
temperature detectors (RTDs) to monitor average product
temperature.
At least one RTD 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 0.66 inches.
Minimum detectable change in water level is 0.039 inches.
|
Calibration
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RTDs and probe must be
checked regularly 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 the 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 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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Evaluator:
Midwest Research Institute
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6900
Santa Fe Dr.
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Tel:
(816) 753-7600
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Hodgkins, IL 60525
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Dates
of Evaluation:
02/08/94, 09/19/97
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Tel:
(708) 485-4200
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01/04/00
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