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Issue
Date: November 14, 1997
Revision Date: June 8, 2005
Veeder-Root
(originally
listed as Gilbarco Environmental Products and later as Marconi
Commerce Systems)
EMC,
EMC Basic, EMC Enhanced with CSLD,
PAO265XXXX100 (Same as Veeder-Root Model 8473),
PA0300XXXX100 (Same as Veeder-Root Model 8473)
(Magnetostrictive Probe)
CONTINUOUS
IN-TANK LEAK DETECTION METHOD (CONTINUOUS AUTOMATIC TANK GAUGING)
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Certification
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Leak
rate of 0.2 gph with PD = 100% and PFA = 0%.
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Leak
Threshold
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0.16
gph for single tanks at 99% operating mode.
0.15 gph for manifolded tank systems at 99% operating
mode.
A tank system should not be declared tight, and a message
is printed for the operator, if the test results indicate
a loss or gain that exceeds this threshold.
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Applicability
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Gasoline,
diesel, aviation fuel.
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 38,170 gallons for single tanks and for all tanks manifolded
together.
Contact manufacturer for tank system applications if total
tank capacity exceeds 30,000 gallons.
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Throughput
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Monthly
maximum of 221,890 gallons.
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Waiting
Time
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Minimum
of 3 hours stabilization time is allowed between delivery
and data collection.
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Test
Period
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Data
collection time ranges from 5 to 28 days.
Data sampling frequency is every 1 to 4 seconds.
System collects data at naturally occurring product levels
without interfering with normal tank operation, and discards
data from unstable periods when system performs test.
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Temperature
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Average
for product is determined by a minimum of 5 thermistors.
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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 0.54 inch.
Minimum detectable change in water level is 0.027 inch.
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Calibration
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Thermistors
and probe must be checked annually and, if necessary,
calibrated in accordance with manufacturer's instructions.
System set-up menu must be checked to verify that the
99% operating mode option has been selected.
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Comments
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During installation, the
set-up menu provides a choice between a 99% or a 95%
operating mode. This evaluation covers only the 99%
operating mode. At this time, there is no evaluation
covering the 95% mode. System reports a result of "pass"
or "fail."Evaluated using both single and
manifolded tank systems with probes in each tank. System
distinguishes large leak rates (> 1gph) from dispensing
activities and reports those as "fail" or
as "no idle." For valid monthly testing, a
conclusive test report must be produced for each tank
every month. Systems warns the operator if there are
no " passing" tests completed during the month.
For very active tanks, a tank shut down may become necessary
in order for the system to collect enough quiet-time
data for a test. Constant and variable leaks were mathematically
induced into tight tank test records which were collected
by systems installed at various active tank sites. The
data base for evaluation of the system included sites
with vapor recovery and blending dispensers. Tanks used
in this evaluation contained gasoline and diesel.
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Veeder-Root
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Evaluator: Midwest Research Institute
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125 Powder Forest Dr.
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Tel: (816) 753-7600
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Simsbury, CT 06070-2003
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Date
of Evaluation: 06/10/96,
4/02/02
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Tel: (860) 651-2700
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E-mail: dhalla@veeder.com
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URL: www.veeder.com/dynamic/index.cfm
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