Issue
Date: August 23, 1999
Revision Date: March 1, 2011
Veeder-Root
(originally listed as Marley Pump Co.)
Prolink
System RJE Probes # RE-400-094 thru 112-5
(Magnetostrictive Probes)
AUTOMATIC
TANK GAUGING METHOD
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Certification
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Leak
rate of 0.2 gph with PD = 99.95% and PFA = 0.005%.
Leak rate of 0.1 gph with PD = 95.2% and PFA = 0.5%.
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Leak
Threshold
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-0.116
gph to declare a leak for leak rate of 0.2 gph.
0.084 gph to declare a gain for leak rate of 0.2gph.
-0.065 gph to declare a leak for leak rate of 0.1 gph.
0.035 gph to declare a gain for leak rate of 0.1 gph.
A tank system should not be declared tight if the test
indicates a loss or gain that equals or exceeds the threshold.
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Applicability
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Gasoline, diesel, biodiesel blends B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751*.
Other liquids with known coefficients of expansion and density may be tested after consultation with the manufacturer.
*NWGLDE Listings apply to leak detection functionality only and not material compatibility - see "Disclaimer".
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Tank
Capacity
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Maximum
of 18,000 gallons.
Tanks less than 95% full may be tested.
Minimum product level required is based on tank diameter
as follows:
48" dia/ min 16";
64" dia/ min 21";
72" dia/ min 24";
126" dia/ min 41".
For other tank diameters, see evaluation report.
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Waiting
Time
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Minimum
of 13 hours 54 minutes between delivery and testing.
Minimum of 10 minutes between dispensing and testing.
There must be no delivery during waiting time.
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Test
Period
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Minimum
of 4 hours, 31 minutes for leak rate of 0.2 gph.
Minimum of 6 hours, 39 minutes for leak rate of 0.1 gph.
Test data are acquired and recorded by system's computer.
Leak rate is calculated from all the data collected during
entire test period.
There must be no dispensing or delivery during testing.
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Temperature
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Probe
contains 5 or more resistance temperature detectors (RTDs)
to monitor product temperature.
At least one RTD must be submerged in product during testing.
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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 0.106 inches.
Minimum detectable change in water level is 0.058 inches.
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Calibration
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RTDs
and 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.
System has a bias of -0.016 gph for leak rate of 0.2
gph.
System has a bias of -0.015 gph for leak rate of 0.1
gph.
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.
California regulations
require at least one test per month after routine product
delivery or when the tank is filled to within 10% of
the highest operating level of previous month. 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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