|
Issue Date: January 11, 2001
Ronan
Engineering Co.
X76CTM Series
Monitoring System with:
(Series 7100 Magnetostrictive Probe, X76MP Series Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
| Certification |
Leak rate of 0.2
gph with PD = 99.9% and PFA = 0.1% for Precision Test with either
probe.
Leak rate of 0.2 gph with PD = 99.2% and PFA = 0.1% for Quick Test with
Series 7100 Probe.
Leak rate of 0.2 gph with PD = 99.6% and PFA = 0.1% for Quick Test with
X76MP Series Probe.
Leak rate of 0.1 gph with PD = 95.1% and PFA = 4.9% for 0.1gph Test with
Series 7100 Probe.
Leak rate of 0.1 gph with PD = 95.1% and PFA = 1.8% for 0.1gph Test with
X76MP Series Probe. |
| Leak
Threshold |
0.1 gph for leak
rate of 0.2 gph, Precision Test with Series 7100 Probe.
0.115 gph for leak rate of 0.2 gph, Precision Test with X76MP Series
Probe.
0.115 gph for leak rate of 0.2 gph, Quick Test with Series 7100
Probe.
0.129 gph for leak rate of 0.2 gph, Quick Test with X76MP Series
Probe.
0.05 gph for leak rate of 0.1 gph, 0.1gph Test with Series 7100
Probe.
0.066 gph for leak rate of 0.1 gph, 0.1gph Test with X76MP Series
Probe.
A tank system should not be declared tight if the test result indicates a
loss that equals or exceeds this threshold. |
| Applicability |
Gasoline, diesel,
aviation fuel, fuel oil #4. |
| Tank
Capacity |
Maximum of 20,000
gallons.
Tanks less than 95% full may be tested.
Minimum product level required based on test mode as follows:
For Quick Test with either probe, Precision Test with Series 7100 Probe,
and 0.1gph Test with X76MP Series Probe, the minimum product level is
computed as probe length divided by 6 plus 5 inches.
For Precision Test with X76MP Series Probe and 0.1 gph Test with Series
7100 Probe, the minimum product level is 50% of tank capacity. |
| Waiting
Time |
Minimum of 1 hour
between delivery and testing for Quick Test.
Minimum of 6 hours between delivery and testing for Precision Test and 0.1
gph Test.
There must be no delivery during waiting time. |
| Test
Period |
Minimum of 2
hours for all tests.
Test data are acquired and recorded by system's 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 probe with 5 thermistors.
At least one thermistor must be submerged in product during test. |
| Water
Sensor |
Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.661 inch.
Minimum detectable water level change is 0.011 inch.
System is default programmed to report a water depth only when it exceeds
3.5 inches.
System can be programmed to report a water depth of 0.661 inch and above. |
| Calibration |
System 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. |
|
Ronan
Engineering Co.
|
Evaluator:
Ken Wilcox Associates
|
|
21200
Oxnard St.
|
Tel:
(816) 443-2494
|
|
Woodland
Hills, CA 91367
|
Date of
Evaluation: 08/15/99
|
|
Tel:
(800) 327-6626
|
|
|
