Issue Date: November 22, 1995
Revision Date: March 10, 2000
Andover Controls Corp.
CX9000, CX9200, CMX240
AUTOMATIC TANK GAUGING METHOD
||Leak rate of 0.2 gph with PD = 99.9% and
PFA < 0.1%.
Leak rate of 0.1 gph with PD = 97.6% and PFA = 2.4%.
||0.1 gph for leak rate of 0.2 gph.
for leak rate of 0.1 gph.
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 15,000 gallons.
Tank must be between 50 and 95% full.
||Minimum of 6 hours between delivery and
Minimum of 3 hours between dispensing and testing.
There must be no delivery during waiting time.
||Minimum of 6 hours.
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.
||Average for product is determined by a
minimum of 3 resistance temperature detectors (RTDs).
||Must be used to detect water ingress.
Minimum detectable water level in the tank is 0.35 inch.
Minimum detectable change in water level is 0.003 inch.
||RTDs and probe must be checked and, if
necessary, calibrated in accordance with manufacturer's instructions.
||Not 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
of Evaluation: 05/24/93