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Issue Date: March 10, 2000
Steel Tank
Institute
Permatank
Precision Interstitial Vacuum Monitor
INTERSTIITIAL TANK TIGHTNESS
TEST METHOD
| Certification |
Leak rate of 0.1
gph with PD = 100% and PFA =0%. |
| Leak
Threshold |
0.01 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. |
| Tank
Capacity |
Maximum of 50,000
gallons. |
| Waiting
Time |
None. |
| Test
Period |
12 hours for
tanks less than 10,000 gallons.
24 hours for tanks 10,000 gallons to 50,000 gallons. |
| Comments |
System performs
post installation tank tightness test of Steel Tank Institute's
double-wall Permatank prior to adding product to tank.
System conducts vacuum test on interstitial space between inner steel wall
and outer fiberglass wall of Steel Tank Institute's Permatank and detects
breaches in either inner or outer wall.
For use only on Permatank underground storage tanks manufactured by Steel
Tank Institute.
Minimum initial vacuum on interstitial space is 13 inches mercury.
Tank declared tight when vacuum decrease is less than 5 inches mercury
over specified test period. Vacuum readings must be recorded on Steel Tank
Institute's installation checklist. |
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Steel Tank Institute
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Evaluator:
Ken Wilcox Associates
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570 Oakwood Rd.
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Tel: (816) 443-2494
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Lake Zurich, IL 60047
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Date of Evaluation:
03/25/93
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Tel: (847) 438-8265
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