Issue Date: July 2, 2001
Revision Date: December 21, 2005
Varec,
Inc.
(originally listed as
Coggins Systems, Inc. and later as Endress + Hauser Systems
and Gauging)
Fuels
Manager with Barton 3500 ATG
AUTOMATIC
TANK GAUGING METHOD
|
Certification
|
Leak
rate of 0.2 gph with PD = 95.3% and PFA = 4.7%.
|
|
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 75,000 gallons.
Tank must be between 50 and 95% full.
|
|
Waiting
Time
|
Minimum
of 4 hours between delivery and testing.
Minimum of 2 hours between dispensing and testing.
There must be no delivery during waiting time.
|
|
Test
Period
|
Minimum
of 24 hours.
Test data are acquired and recorded by system's computer.
Leak rate is calculated from the average of subsets of
all data collected.
There must be no dispensing or delivery during test.
|
|
Temperature
|
Measurement
of product temperature is not required by this system.
|
|
Water
Sensor
|
Must
be used to detect water ingress.
Minimum detectable water level in the tank is 0.509 inch.
Minimum detectable change in water level is 0.225 inch.
|
|
Calibration
|
Probe
must be checked and, if necessary, calibrated in accordance
with manufacturer's instructions.
|
|
Comments
|
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.
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.
|
