Issue Date: November 22, 1995
Revision Date: September 11, 1998
Detection Kernel Version 1.0 with Keeprobe K7
AUTOMATIC TANK GAUGING METHOD
||Leak rate of 0.2
gph with PD = 95.4% and PFA = 4.6%.
A tank system should not be declared tight if the test result indicates a
loss or gain that equals or exceeds this threshold.
aviation fuel, fuel oil #4.
||Maximum of 15,000
Tank must be between 50 and 90% full.
||Minimum of 8
hours, 6 minutes between delivery and testing.
Minimum of 15 minutes after a maximum dispensing rate of 50 gallons per
There must be no delivery during waiting time.
||Minimum of 3
Test data are acquired and recorded by system's computer.
Leak rate is calculated as the average of subsets of all data
There must be no dispensing or delivery during test.
product is determined by a minimum of 5 resistance temperature detectors (RTDs).
||Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.41 inch.
Minimum detectable water level change is 0.0013 inch.
Check diagnostic routine is recommended prior to leak detect tests to
ensure sensor is fully operational and in calibration.
Annual preventative maintenance should be performed in accordance with
using manifolded tank systems. Therefore, this certification is only
applicable when there is a probe used in each tank and the siphon is broken
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.
Arizona State University
P. O. Box 14830