|
Issue Date: August 23, 1999
Revision Date: March 10, 2000
Pneumercator
Company, Inc.
TMS 2000, TMS
3000
(Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
| Certification |
Leak rate of 0.2
gph with PD = 95.0% and PFA = 5% for 2 hour test.
Leak rate of 0.2 gph with PD = 99.8% and PFA = 0.2% for 4 hour test
Leak rate of 0.2 gph with PD = 99.9% and PFA = 0.1% for 8 hour test.
Leak rate of 0.1 gph with PD = 95.3% and PFA = 4.7% for 7 hour test.
Leak rate of 0.1 gph with PD = 95.8% and PFA = 4.2% for 8 hour test. |
| 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. |
| Tank
Capacity |
Maximum of 20,000
gallons.
Tank must be between 20 and 95% full. |
| Waiting
Time |
Minimum of 8
hours between delivery and testing.
Minimum of 20 minutes between dispensing and testing.
There must be no delivery during waiting time. |
| Test
Period |
Minimum of 2
hours for leak rate of 0.2 gph.
Minimum of 7 hours for leak rate of 0.1 gph.
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 determined by probe which contains 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 0.488 inch.
Minimum detectable change in water level is 0.124 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. |
|
Pneumercator Company, Inc.
|
Evaluator:
Ken Wilcox Associates
|
|
1785 Expressway Drive North
|
Tel: (816) 443-2494
|
|
Hauppauge, NY 11788
|
Date of Evaluation:
07/15/97
|
| Tel: (800) 209-7858, (631) 293-8450 x112 |
|
|
E-mail: jlevy@pneumercator.com
|
|
| UEL: www.pneumercator.com |
|
