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 *

Certification 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.
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, water, kerosene.
Other liquids may be tested after consultation with the manufacturer.
Tank Capacity Between 20,500 gallons and 45,000 gallons. (Very important update for this particular test method)
Tank must be minimum 78.6% full.
Waiting Time 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.
Test Period 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.
Temperature Average for product is determined from the measurement of the change in the speed of sound.
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 1 psi at bottom of the tank during test.
Comments

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.
  • Sound Products Manufacturing, Inc.
    435 Industrial Parkway
    Lafayette, LA 70508
    Tel: (337) 235-1184
  • Evaluator: Midwest Research Institute
    Tel: (816) 443-2494
    and Ken Wilcox Associates
    Tel: (816) 443-2494
    Date of Evaluation: 12/05/90 (1000-10,000 gallons), 08/04/92 (10,000-45,000 gallons)

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