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Issue Date: November 22, 1995
Revision Date: March 10, 2000
Patriot
Sensors and Controls Corp.
(originally listed as MagneTek)
7021 Digital
Tank Gauge
(7030 Series Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
| Certification |
Leak rate of 0.2
gph with PD = 99.96% and PFA = 0.044%.
Leak rate of 0.1 gph with PD = 95.34% and PFA = 4.66%. |
| 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.
Other liquids with known coefficients of expansion and density and where
specific gravity is > 0.6 and viscosity is < 1500 cp may be tested
after consultation with manufacturer. |
| Tank
Capacity |
Maximum of 15,000
gallons.
Tank must be between 50 and 95% full for leak rate of 0.2 gph.
Tank must have minimum product height of 18 inches, or be 14% full,
whichever is higher, for leak rate of 0.1 gph. |
| Waiting
Time |
Minimum of 2
hours between delivery and testing for leak rate of 0.2 gph.
Minimum of 8 hours between delivery and testing for leak rate of 0.1
gph.
There must be no dispensing or delivery during waiting time. |
| Test
Period |
Minimum of 4
hours.
Test data are acquired and recorded by a 7021 controller (computer).
Leak rate is calculated from data determined to be statistically
valid.
There must be no dispensing or delivery during test. |
| Temperature |
Average for
product is determined by a minimum of 1 resistance temperature detector (RTD). |
| Water
Sensor |
Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.947 inch.
Minimum detectable water level change is 0.0254 inch. |
| Calibration |
RTD 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. |
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Patriot
Sensors and Controls Corp.
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Evaluator:
Ken Wilcox Associates
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1080 N.
Crooks Rd.
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Tel:
(816) 443-2494
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Clawson,
MI 48017-1097
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Date of
Evaluation: 02/07/91
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Tel:
(810) 435-0700
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