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Issue Date: November 22, 1995
Revision Date: July 23, 2003
Phoenix Technologies
Division of Phoenix Group
(formerly listed as Arizona Instrument Corp. and NESCO)
Encompass USF
IPAM #17-901
(Ultrasonic Probe #17-9100)
AUTOMATIC TANK GAUGING METHOD
| Certification |
Leak rate of 0.2
gph with PD = 99.94% and PFA = 2.06%. |
| 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.
Tank must be between 50 and 95% full. |
| Waiting
Time |
Minimum of 3
hours between delivery and testing.
There must be no dispensing or delivery during waiting time. |
| Test
Period |
Minimum of 6
hours.
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 obtained by a single temperature sensor that measures change in
ultrasonic wave velocity. |
| Water
Sensor |
Must be used to
detect water ingress.
Minimum detectable water level in the tank is 1.86 inches.
Minimum detectable change in water level is 0.012 inch. |
| Calibration |
Temperature
sensor 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 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.
Encompass software provides for remote access capabilities. |
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Phoenix Technologies
Division of Phoenix Group
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Evaluator:
Ken Wilcox Associates
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2125 South 48th
Street, Suite 106
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Tel: (816) 443-2494
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Tempe, AZ 85282
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Date of Evaluation:
08/22/94
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Tel: (877) 890-3808
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E-mail: sales@opsmart.net |
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URL: www.opsmart.net |
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