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Issue Date: July 14, 2003
Dresser Wayne Europe
TIG 5000 0.2
gph Precision Test and Quick Test
(Q0400-4xx Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
| Certification |
Leak rate of 0.2
gph with PD = 99.1% and PFA = 0.9% for Precision Test.
Leak rate of 0.2
gph with PD = 95.4% and PFA = 4.6% for Quick Test. |
| 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, fuel oil #4. |
| Tank
Capacity |
Maximum of 15,000
gallons. Tanks less than 95% full may be tested. Minimum product level
required based on tank diameter as follows:
48" dia/min 8.5";
64" dia/min 10.5";
72" dia/min 11.5";
96" dia/min 14";
126" dia/min 18".
For other tank diameters, see evaluation report. |
| Waiting
Time |
Between delivery
and testing ranges from 1 to 6 hours depending on tank conditions.
None between dispensing and testing.
There must be no delivery during waiting time. |
| Test
Period |
Average of 2
hours, 46 minutes during Precision Test evaluation.
Average of 1 hour, 9 minutes during Quick Test evaluation.
Test data are acquired and recorded by a microprocessor which
automatically determines test time based on tank size and product
level.
There must be no dispensing or delivery during test. |
| Temperature |
Probe contains 5
resistance temperature detectors (RTDs) to monitor average product
temperature.
At least one RTD must be submerged in product during test. |
| Water
Sensor |
Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.66 inches.
Minimum detectable change in water level is 0.039 inches. |
| Calibration |
RTDs and 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 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. |
|
Dresser Wayne AB
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Evaluator: Ken
Wilcox Associates
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Limhamnsvagen 109, Box 30049
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Tel: (816)
443-2494
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SE-200 61 Malmo, Sweden
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Dates of Evaluation:
12/23/93, 06/20/94
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Tel: Unavailable
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08/17/95, 07/28/97, 11/17/99
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