Issue
Date: November 22, 1995
Revision Date: June 24, 2002
Veeder-Root
(originally
listed as Gilbarco Environmental Products and later as Marconi
Commerce Systems)
EMC
Environmental Management Console
EMC Basic Monitoring System Tank Monitors 2, 3, 2.1, 3.1,
PAO238000XXXX (Same as Veeder-Root Model 7842)
(Capacitance Probe)
AUTOMATIC
TANK GAUGING METHOD
|
Certification
|
Leak
rate of 0.2 gph with PD = 99% and PFA = 1%.
|
|
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.
|
|
Applicability
|
Gasoline,
diesel, aviation fuel.
Other liquids with known coefficients of expansion and
density may be tested after consultation with the manufacturer.
|
|
Tank
Capacity
|
Maximum
of 15,000 gallons.
Tank must be between 50 and 95% full.
|
|
Waiting
Time
|
Minimum
of 8 hours, 18 minutes between delivery and testing.
There must be no dispensing or delivery during waiting
time.
|
|
Test
Period
|
Minimum
of 5 hours.
Test data are acquired and recorded by system's computer.
Leak rate is calculated from the difference between the
first and last data collected.
There must be no dispensing or delivery during test.
|
|
Temperature
|
Average
for product is obtained by a temperature averaging probe.
|
|
Water
Sensor
|
Must
be used to detect water ingress.
Minimum detectable water level in the tank is 1.40 inches.
Minimum detectable change in water level is 0.040 inch.
|
|
Calibration
|
Temperature
averaging probe must be checked and, if necessary, calibrated
in accordance with manufacturer's instructions.
|
|
Comments
|
Not
evaluated using manifolded tank systems.
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.
Capacitance probes do not work with oxygenated fuels.
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.
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