Issue
Date: November 22, 1995
Revision Date: March 1, 2011
Veeder-Root
(originally listed as Marley Pump Co.)
Sonic
Technology (ST) 1400-1800 Series Tank Monitoring System,
ProLink System with Ultrasonic Network Card,
ATG
Automatic Tank Gauging Monitor,
LLM Series Liquid Level Monitor,
FMS Fuel Management Monitor
(Ultrasonic Probe)
AUTOMATIC
TANK GAUGING METHOD
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Certification
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Leak rate of 0.2 gph with PD = 99.9% and PFA = 2.98% for single tanks.
Leak rate of 0.2 gph with PD = 99.9% and PFA = 2.53% for manifolded tanks.
Leak rate of 0.1 gph with PD = 99.9% and PFA = 0.01%.
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Leak
Threshold
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0.1
gph for leak rate of 0.2 gph.
0.05 gph for leak rate of 0.1gph.
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, jet fuel, 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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For leak rate of 0.2 gph:
Maximum of 73,530 gallons.
Maximum of 73,530 gallons cumulative capacity for manifolded tank systems with no more than 4 tanks in the system.
Tank must contain at least 15 inches of product.
For leak rate of 0.1 gph:
Maximum
of 18,000 gallons.
Tank
must be minimum 95% full.
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Waiting
Time
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Minimum of 9.1 hours between delivery and testing for leak rate of 0.2 gph.
Minimum of 12 hours between delivery and testing for leak
rate of 0.1 gph.
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 2 hours, 20 minutes for a leak rate of 0.2 gph.
Minimum of 2 hours, 21 minutes for a leak rate of 0.1 gph.
Test data are acquired and recorded by system's computer.
Leak rate is calculated from all data collected.
There must be no dispensing or delivery during test.
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Temperature
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Average for product is determined by five or more temperature sensors.
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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 0.112 inch.
Minimum detectable water level change is 0.011 inch.
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Calibration
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Temperature
sensors and probe must be checked and, if necessary, calibrated
in accordance with manufacturer's instructions.
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Comments
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Evaluated using both single and manifolded tank system with probes in each tank. The difference between the product level and groundwater level must be at least 2.75 feet if groundwater is present above the bottom of the tank.
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.
System was previously known as LT1 Automatic Product
Level Monitor and was manufactured by Level Tech, Inc.
(purchased by Marley 9/91).
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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