Issue Date: April 17, 2002
Revision Date: January 12, 2011
(previously listed as Sound Products Manufacturing, Inc.)
TANK TIGHTNESS TEST METHOD (UNDERFILL)
||Leak rate of 0.1 gph with PD =
97.0% and PFA = 0.6%
A tank system should not be
declared tight if the test result indicates a loss or gain that equals or
exceeds this threshold.
||Gasoline, diesel, aviation fuel, fuel oil
||Maximum of 20,000 gallons.
Minimum product level required is 15 inches (1 inch above lowest calibration
||Minimum of 4 hours between delivery and
There must be no dispensing or delivery during waiting time.
Minimum of 1 hour.
be no dispensing or delivery during test.
||Average for product is determined by an
ultrasonic probe containing 5 temperature targets.
Targets located above the
product surface are not used in data analysis.
If a test is to be conducted following a product delivery, the temperature
difference between the product in the tank and the product delivered should
not exceed 7.7
||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.
||Probe must be checked regularly and, if
necessary, calibrated in accordance with manufacturer’s instructions.
System consists of an ultrasonic probe which
interfaces with a micro processing unit.
Not evaluated using manifolded tank systems.
Tests only portion of tank containing
As product level is
lowered, leak rate in a leaking tank decreases (due to lower head
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.
Ken Wilcox Associates
102 Abigayle Row
Tel: (816) 443-2494
Scott, LA 70508
Date of Evaluation: 07/11/01
Tel: (337) 235-1184