Franklin Fueling Systems TS 550 evo Fuel Management System Operators Guide - Manual (Page 21)

17
Statistical Continuous Automatic Leak
Detection (SCALD)
SCALD (Statistical Continuous Automatic Leak Detection)
runs 24hrs a day performing 0.2 GPH tests on tanks at
sites that do not have enough quiet time to complete static
tests (some static tests may take up to eight hours to
complete).
SCALD Testing is available only if the option for Tank
Testing is enabled. This option can be ordered when
initially purchasing the console or afterwards. The part
number for this option is TS-TT for the TS-550 evo.
Why Continuously Test Tank Integrity
In compliance with federal, state and local regulatory
policies, all tanks must be monitored for leaks due to
environmental and public safety/health concerns. Tank
Integrity Tests determine whether there is a leak.
Since SCALD continuously runs statistical tank leak tests
during the inactive periods between product deliveries and
dispensing, it is particularly useful for:
• Operations that are open for business on a continuous
(24 hours, 7 days a week) schedule
• Operations that are open for business on a two-shift
schedule and where deliveries may occur at any time
during non-business hours (normally schedule tank leak
tests may require up to 8 hours of inactivity).
Terms
Qualify – The percentage of product that the tank is
required to contain prior to testing according to the
programmed “Qualify” parameter.
Slope (Tank Testing Reports) – A ratio of the calculated
rate of change to the time the rate is measured. Slope
is affected by leaks and by many other sources of
interference.
Flow
Time No Leak
(+) slope
(–) slope
A negative slope or decrease indicates loss of product
volume. A positive slope or increase indicates a rise in
product volume.
SCALD Testing Requirements
To perform SCALD testing, the SCALD software must be
enabled. To verify that the software is enabled:
1. Starting at the Home screen, open the Quick Jump
Menu.
2. Select Utilities from the QJM then select System.
3. Press the Software Options Button.
4. Under Software Options, Tank Testing will appear.
A “yes” in the Enabled column indicates that the
software has been purchased and is enabled.
When SCALD Tests
SCALD works by collecting quiet intervals in-between
dispensing. A “QI” is obtained when a thermally stable tank
is idle for 20 minutes with no dispensing, no deliveries
and no other movement of the probe floats. Once four QIs
are collected, the console will analyze the data and either
Pass, Fail, Incomplete, or Abort that test. The four QIs can
be collected over a period of several days or weeks.
SCALD Results
Pass – A passing result ensures the integrity of the tank is
good.
Fail – Test failure will be indicated by a Warning light and/or
annunciator. Additionally, a report may print (if the console
is programmed to do so, see the TS-550 evo Programming
Guide p/n 000-2173).
Abort – The result is due to variations in float level and/
or product temperature that are outside the leak test
threshold. This may be caused by:
• Dispensing • Rapid Temperature Change
• Delivery • Product Lower than the
lowest RTD (Resistance
Temperature Detector)
• Theft • Pump Started
• Loss of Probe Signal
Incomplete – When the test does not collect enough data
before the programmed time limit, the test is Incomplete.
When it is necessary to obtain valid results for compliance
reasons, start the test manually.