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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)
| 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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