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Issue Date: April 18, 1997
Revision Date: July 27, 2009
Simmons Corp.
(originally listed as Caldwell
Systems Corp.)
Simmons/Caldwell Tank Manager (Ultrasonic
Probe)
AUTOMATIC TANK GAUGING METHOD
| Certification |
Leak rate
of 0.2 gph with PD = 99.9% and PFA = 0.1%.
Leak rate of 0.1 gph with PD =
96.7% and PFA = 3.3%. |
| 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, fuel oil #4, waste oil. |
| Tank
Capacity |
Maximum of 20,000
gallons.
Minimum product level required to conduct a test is 18 inches. |
| Waiting
Time |
Minimum of
12 hours, 25 minutes between delivery and testing.
Minimum of 15 minutes
between dispensing and testing.
There must be no delivery during waiting
time. |
| Test
Period |
Minimum of 3
hours, 15 minutes.
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.
Minimum detectable water level in the tank is 0.921
inch.
Minimum detectable change in water level is 0.0315 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.
Water sensor, temperature sensor and product
level monitor are contained in a single ultrasonic probe. |
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Simmons Corp. |
Evaluator:
Ken Wilcox Associates
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106 E. Main
Street |
Tel:
(816) 443-2494
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Richardson,
TX 75081-3327 |
Dates
of Evaluations: 04/22/96, 04/05/99
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Tel: (800) 848-8378
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E-mail:
howard.dockery@simmons-corp.com |
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URL:
www.simmons-corp.com
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