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Issue
Date: November 22, 1995
Revision Date: March 20, 2003
Sound
Products Manufacturing, Inc.
(originally listed as
USTest, Inc.)
UST
2000/P
VOLUMETRIC
TANK TIGHTNESS TEST METHOD (UNDERFILL)
USTest, Inc.,
no longer supports the use of this method *
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Certification
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Leak
rate of 0.1 gph with PD = 99.9% and PFA = 0.1% for tanks
up to 15,000 gallons,
Leak rate of 0.1 gph with PD = 99.7% and PFA = 0.3% for
tanks from 15,000 gallons up to 45,000 gallons.
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Leak
Threshold
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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.
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Applicability
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Gasoline,
diesel, aviation fuel, water, kerosene.
Other liquids may be tested after consultation with the
manufacturer.
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Tank
Capacity
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Between
20,500 gallons and 45,000 gallons. (Very
important update for this particular test method)
Tank must be minimum 78.6% full.
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Waiting
Time
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Minimum
for tanks up to 45,000 gallons must be determined from
the manufacturer's chart of "Wait Time versus Tank
Volume."
This chart must be included in the tank test report.
There must be no dispensing or delivery during waiting
time.
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Test
Period
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Minimum
is one hour.
Minimum for tanks from 20,500 to 45,000 gallons is determined
from the manufacturer's chart of "Differential Volume
versus Test Duration."
Line labeled PD = 99.9% must be used.
This chart must be included in the tank test report.
Test data are acquired and recorded by system's computer,
which does a regression analysis to determine the leak
rate.
All raw data files must be reviewed and certified by equipment
manufacturer prior to the provision of test results to
customer.
There must be no dispensing or delivery during test.
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Temperature
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Average
for product is determined from the measurement of the
change in the speed of sound.
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Groundwater
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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
1 psi at bottom of the tank during test.
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Comments
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Not
evaluated using manifolded tank systems.
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.
* USTest Inc. has requested
removal of the 2000/LL equipment from the NWGLDE List
and discourages the use of this method due to software
security and data integrity problems.
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Sound
Products Manufacturing, Inc.
435 Industrial Parkway
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Evaluators: Midwest Research Institute
Tel: (816) 753-7600
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Lafayette,
LA 70508
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and
Ken Wilcox Associates
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Tel: (337) 235-1184
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Tel:
(816) 443-2494
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Dates
of Evaluations: 12/05/90 (1000-10,000 gallons), 08/04/92
(10,000-45,000 gallons)
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