Issue Date: November 22, 1995
Revision Date: November 14, 1997
AUTOMATIC TANK GAUGING METHOD
rate of 0.2 gph with PD = 96.6% and PFA = 3.4%.
A tank system should not be declared tight if the test result indicates a
loss or gain that equals or exceeds this threshold.
diesel, aviation fuel.
of 15,000 gallons.
Tank must be minimum 90% full.
of 8 hours between delivery and testing.
There must be no dispensing or delivery during waiting time.
of 6 hours.
Test data are acquired and recorded by system's computer.
Leak rate is calculated from average of subsets of all collected
There must be no dispensing or delivery during test.
for product is determined by a minimum of 5 resistance temperature
be used to detect water ingress.
Minimum detectable water level in the tank is 0.83 inch.
Minimum detectable water level change is 0.0116 inch.
and probe must be checked and, if necessary, calibrated in accordance with
evaluated using manifolded tank systems. Therefore, this certification is
only applicable when there is a probe used in each tank and the siphon is
broken during testing.
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
EPA leak detection regulations require testing of the portion of the tank
system which routinely contains product.
Ken Wilcox Associates, Inc.
W. Campus Dr.
of Evaluation: 08/20/93