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Issue Date: November 22, 1995
Revision Date: April 27, 2005
Purpora Engineering,
Inc.
(originally listed as Heath Consultants, Inc.)
Petro Tite II
VOLUMETRIC TANK TIGHTNESS TEST
METHOD (OVERFILL)
Purpora Engineering, Inc. no longer supports use of this method
| Certification |
Leak rate of 0.1
gph with PD = 99% and PFA = 1%. |
| 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. |
| Tank
Capacity |
Maximum of 15,000
gallons.
Tank must be minimum 100% full.
An automatic product leveler must be used to maintain a constant product
level during test. |
| Waiting
Time |
None between
delivery and testing.
There must be no dispensing or delivery during waiting time. |
| Test
Period |
Minimum of 2
hours.
Test data are acquired and recorded manually.
Leak rate calculated based on cumulative volume change during low level
test (generally based on 1 hour average volume change).
Product must be mixed continuously throughout test period.
There must be no dispensing or delivery during test. |
| Temperature |
Average for
product is determined by a single DTS-2000 digital sensor. |
| 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 a minimum net pressure of 4 psi at bottom of tank during test. |
| Calibration |
Sensor
calibration must be checked at each use and, if necessary, calibrated in
accordance with manufacturer's instructions.
The DTS-2000 digital sensor must be recertified a minimum of once every 3
years. |
| Comments |
Not evaluated
using manifolded tank systems. |
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Purpora Engineering Inc.
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Evaluator:
Ken Wilcox Associates
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658 North Progress Drive
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Tel:
(816) 443-2494
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Saukville, WI 53080 |
Date of
Evaluation: 11/01/90
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Tel: (262 536-4081
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E-mail: info@purporaengineering.com |
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URL:
www.purporaengineering.com |
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