Issue Date: November 22, 1995
Revision Date: March 10, 2000
X-76 ETM, X-76
ETM-4X (Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
||Leak rate of 0.2
gph with PD = 99.96% and PFA = 0.044%.
Leak rate of 0.1 gph with PD = 95.34% and PFA = 4.66%.
||0.1 gph for leak
rate of 0.2 gph.
0.05 gph for leak rate of 0.1 gph.
A tank system should not be declared tight if the test result indicates a
loss that equals or exceeds this threshold.
aviation fuel, fuel oil #4.
||Maximum of 15,000
Tank must be between 50 and 95% full for leak rates of 0.2 and 0.1
Tank must have minimum product height of 12 inches or be 14% full,
whichever is higher, when leak threshold is set at 0.049 gph (PD = 95% and
PFA = 5%).
||Minimum of 2
hours between delivery and testing for leak rate of 0.2 gph.
Minimum of 8 hours between delivery and testing for leak rate of 0.1
There must be no dispensing or delivery during waiting time.
||Minimum of 4
Test data are acquired and recorded by system's computer.
Leak rate is calculated from data determined to be statistically
There must be no dispensing or delivery during test.
product is determined by a minimum of 1 resistance temperature detector (RTD).
||Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.947 inch.
Minimum detectable water level change is 0.0254 inch.
||RTD and probe
must be checked and, if necessary, calibrated 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.
X76ETM-4X console has different housing which allows it to be mounted
Ken Wilcox Associates
Hills, CA 91367
of Evaluation: 02/07/91,