Issue Date: January 11, 2001
Revision Date: November 13, 2009
OPW Fuel Management
(originally listed as Emco Electronics, Tuthill Transfer Systems)
1000, 1000EG, 1500, 2000, 3000 and Galaxy ATG Systems
(Q0400-4xx Magnetostrictive Probe or OPW 924/B TLM-B Magnetostrictive
CONTINUOUS IN-TANK LEAK
(Continuous Automatic Tank Gauging)
||Leak rate of 0.2
gph with PD = 99.1% and PFA = 0.9%.
||0.1 gph for
single and manifolded tank systems.
A tank system should not be declared tight and a message printed for the
operator, if the test results indicate a loss or gain that exceeds this
The system is designed primarily for use with petroleum fuels.
||Maximum of 35,000
gallons for single tanks and for up to 2 tanks manifolded together.
of 130,000 gallons.
||Minimum of 6
hours stabilization time is allowed between delivery and data collection.
collection time is 12 days.
During evaluation, data collection time ranged from 1 to 31 days.
Data sampling frequency is at least once per minute.
System collects data at naturally occurring product levels without
interfering with normal tank operation and discards data from unstable
periods when system performs test.
product is determined by a minimum of 5 sensors.
||Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.66 inch.
Minimum detectable change in water level is 0.039 inch.
sensors are factory calibrated.
Probe must be checked and, if necessary, calibrated in accordance with
||System reports a
result of "pass" or "fail."
Evaluated using both single and manifolded tank systems
with probes in each tank.
Data can be collected when the product level is between 9% and 94.9% of
System distinguishes large leak rates (> 1gph) from dispensing
activities and reports those as "fail".
For valid monthly testing, a conclusive test report must be produced for
each tank every month.
System warns operator if there are no "passing" tests completed
during the month.
For very active tanks, a tank shut down may become necessary in order for
the system to collect enough quiet-time data for a test.
The 6-hour stabilization period after delivery may result in the system
not testing the top portion of a very active tank. In this situation, a
periodic test in the shut-down mode with a high product level should be
used to test the entire portion of tank that routinely contains
Because the database for evaluation of the system did not include sites
with vapor recovery, certification is limited to sites with
no vapor recovery.
Evaluated using gasoline.
OPW Fuel Management Systems
Ken Wilcox Associates
Santa Fe Dr.
Tel: (816) 443-2494
Hodgkins, IL 60525
Dates of Evaluation:
Tel: (708) 485-4200