Issue Date: November 22, 1995
Revision Date: September 18, 2007
OPW Fuel Management
(originally listed as Petro Vend, Inc.)
Models 2 and 3,
(Model 613, 4 inch dia Floats, Magnetostrictive Probe)
AUTOMATIC TANK GAUGING METHOD
||Leak rate of 0.2
gph with PD = 99.82% and PFA = 0.18%.
Leak rate of 0.1 gph with PD = 99.95% and PFA = 0.35%.
||0.1 gph for leak
rate of 0.2 gph.
0.06 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.
||Maximum of 15,000
Tank must be between 50 and 95% full for leak rate of 0.2 gph.
Tank must be minimum 90% full for leak rate of 0.1 gph.
||Minimum of 12
hours between delivery and testing.
There must be no delivery during waiting time.
Minimum of 30 minutes between dispensing and testing.
||Minimum of 2
hours for leak rate of 0.2 gph.
Minimum of 4 hours for leak rate of 0.1 gph.
Test data are acquired and recorded by system's computer.
Leak rate is calculated as the difference between the first and last 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 0.92 inch.
Minimum detectable change in water level is 0.02 inch.
||RTDs 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.
Site Sentinel models 2 and 3 were formerly models II and III respectively.
OPW Fuel Management Systems
Underwriters Laboratories, Inc.
6900 Santa Fe Dr.
Tel: (847) 272-8800
Hodgkins, IL 60525-9909
Date of Evaluation:
Tel: (708) 485-4200