|
Issue Date: November 22, 1995
Revision Date: November 14, 1997
Egemin Naamloze
Vennootschap
E'SPI IV (Mass
Buoyancy Probe)
AUTOMATIC TANK GAUGING METHOD
| Certification |
Leak rate of 0.2
gph with PD = 97.2% and PFA = 0.3%. |
| 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 6
hours between delivery and testing.
There must be no dispensing or
delivery during waiting time. |
| Test
Period |
Minimum of 2
hours, 15 minutes.
Test data are acquired and recorded by system's
computer.
Leak rate is calculated from average of subsets of all collected
data.
There must be no dispensing or delivery during test. |
| Temperature |
Average for
product is determined by a minimum of 5 thermistors. |
| Water
Sensor |
Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.253
inch.
Minimum detectable change in water level is 0.029 inch. |
| Calibration |
Thermistors 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. |
|
Egemin Naamloze
Vennootschap
|
Evaluator:
Midwest Research Institute
|
|
Bredabaan 1201 - 2900
|
Tel: (816) 753-7600
|
|
Schoten, Belgium
|
|
|
Tel: 011-32-3-03/645 2790
|
Date of Evaluation:
12/21/90
|
|
