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Issue Date: November 22, 1995
Revision Date: May 19, 2009
OPW Fuel Management
Systems
(originally listed as Emco Electronics, Tuthill Transfer Systems)
EECO System
1000, 1500, 2000, 3000 and Galaxy 0.2 gph Precision Test and Quick Test
(Q0400-4xx Magnetostrictive Probe or OPW 924/B TLM-B Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
| Certification |
Leak rate of 0.2
gph with PD = 99.1% and PFA = 0.9% for Precision Test using Q0400-4xxx
probe.
Leak rate of 0.2
gph with PD = 95.4% and PFA = 4.6% for Quick Test using Q0400-4xxx probe.
Leak rate of 0.2
gph w/PD = 98.4% and PFA = 1.6% using 924/B TLM-B probe. |
| 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.
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| Tank
Capacity |
Maximum of 15,000
gallons. Tanks less than 95% full may be tested. Minimum product level
required based on tank diameter as follows:
48" dia/min 8.5";
64" dia/min 10.5";
72" dia/min 11.5";
96" dia/min 14";
126" dia/min 18".
For other tank diameters, see evaluation report. |
| Waiting
Time |
From 1 to 6 hours
between delivery and testing depending on tank conditions with Q0400-4xxx
probe.
6 hours between
delivery and testing with 924/B TLM-B probe.
None between dispensing and testing.
There must be no delivery during waiting time. |
| Test
Period |
Average of 2
hours, 46 minutes using Q0400-4xxx probe during Precision Test evaluation.
Average of 1 hour, 9 minutes using Q0400-4xxx probe during Quick Test evaluation.
Test period of 4
hours using 924/B TLM-B probe.
Test data are acquired and recorded by a microprocessor which
automatically determines test time based on tank size and product
level.
There must be no dispensing or delivery during test. |
| Temperature |
Probe contains 5
resistance temperature detectors (RTDs) (5 thermistors for 924B/TLM-B
probe) to monitor average product
temperature.
At least one RTD must be submerged in product during test. |
| Water
Sensor |
Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.66 inches using Q0400-4xxx
probe..
Minimum detectable change in water level is 0.039 inches using Q0400-4xxx
probe.
Minimum detectable
water level in the tank is 0.75 inches using 924/B TLM-B probe.
Minimum detectable
change in water level is 0.08 inches using 924/B TLM-B probe. |
| Calibration |
RTDs (or
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 the 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
which routinely contains product. |
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OPW Fuel Management Systems
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Evaluator: Ken
Wilcox Associates
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6900
Santa Fe Dr.
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Tel: (816)
443-2494
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Hodgkins, IL 60525
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Dates of Evaluation:
12/23/93, 06/20/94
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Tel:
(708) 485-4200
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08/17/95, 07/28/97, 11/17/99
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E-Mail:
info@opwfms.com |
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URL: www.opwfms.com |
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