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Issue Date: July 19, 1996
Revision Date: April 4, 2007
USTest, Inc.
(previously listed as Sound Products Manufacturing, Inc.)
UST 2001 and
UST 2001 Quick Test
(Ultrasonic Probe)
AUTOMATIC TANK GAUGING METHOD
| Certification |
Leak rate
of 0.2 gph with PD = 97.5% and PFA = 2.5% for Quick Test.
Leak rate of 0.1
gph with PD = 95.2% and PFA = 4.8%. |
| Leak
Threshold |
0.1 gph for leak
rate of 0.2 gph.
0.05 gph for leak rate of 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. |
| Tank
Capacity |
Maximum of 15,000
gallons.
Tank must be between 50 and 95% full. |
| Waiting
Time |
Minimum of 4
hours between delivery and testing.
Minimum of 15 minutes between dispensing
and testing. There must be no delivery during waiting time. |
| Test
Period |
Minimum of
30 minutes for leak rate of 0.2 gph (Quick Test).
With a test period of 1
hour, system has PD = 99.9% and PFA = 0.1%.
Minimum of 1 hour for leak
rate of 0.1 gph.
With a test period of 2 hours, system has PD = 98.6% and PFA = 1.4%.
Test data are acquired and recorded by system's computer.
Leak
rate is calculated from data determined to be valid by statistical
analysis. There must be no dispensing or delivery during test. |
| Temperature |
Average for
product is determined from the measurement of the change in the speed of
sound. |
| Water
Sensor |
Must be used to
detect water ingress. water is declared via an ultrasonic signal ranging to
the water interface. Minimum detectable water level in the tank is less than
0.1 inch.
Minimum detectable change in water level is 0.046 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. |
|
Southwest Environmental
Services, Inc.
|
Evaluator:
Ken Wilcox Associates
|
|
102 Abigayle Row
|
Tel:
(816) 443-2494 |
|
Scott, LA 70508
|
Date
of Evaluation: 06/06/95
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Tel: (337) 235-1184
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