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Issue Date: March 13, 2017
FAFNIR
VISY-X Systems
VOLUMETRIC TANK TIGHTNESS TEST
METHOD (UNDERFILL)
| Certification |
Leak rate of 0.1 gph with PD = 97.95% and PFA = 2.05%. |
| Leak
Threshold |
0.05 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, solvents.
All chemicals compatible with sensors. |
| Tank
Capacity |
Maximum of 20,000 gallons.
Tank must be minimum 90% full. |
| Waiting
Time |
Minimum of 8 hours between delivery and testing.
No wait time between "topping off" and testing. |
| Test
Period |
Minimum of 4 hour. Testing is conducted at night.
Total time needed to test, waiting time plus testing time, is 12 hours.
Test data are acquired and recorded by system's computer. |
| Temperature |
Temperature of added product should not differ more than +7oF from existing product temperature. |
| Groundwater |
Depth to groundwater in tank excavation backfill must be determined.
If groundwater is above bottom of tank, product level must be adjusted to provide net pressure of at least one (1) psi outward differential pressure at bottom of tank. |
| Comments |
Not evaluated
using manifolded tank systems.
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FAFNIR GmbH
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Evaluator: Ken Wilcox Associates, Inc.
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Schnackenburgallee 149 c
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1125 Valley Ridge Dr. |
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22525 Hamburg, Germany
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Grain Valley, MO 64029
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| Tel: +49/40/398207 - 0 |
Tel: (816) 443-2494 |
| E-mail: info@fafnir.de |
Date of
Evaluation:
10/29/2009 |
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URL: www.fafnir.com |
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