Testing Procedures
Resiliency Test
13
TO PERFORM A VACUUM TEST
1.
Install the FXT.
2.
Turn on the submersible. Observe the compound gauge. Make sure line pressure is a least 25 psi (172 kPa).
3.
Turn off the submersible. Observe the compound gauge. Make sure line pressure drops to 0 psi.
4.
Continue to watch the gauge for approximately 10-15 minutes.
5.
If you observe the gauge reading pass 0 psi and falling into the vacuum range, thermal contraction is affecting
the piping system and a good possibility exists that air may be entering the system.
The most severe thermals will occur after dispensing of a large volume of fuel from the dispenser that
is farthest away.
Resiliency Test
1.
With the FXT’s Selector Valve set to the ‘Pump/Line Pressure’ position, install a 014-605 fitting onto the black
hose. this will allow a discharge to occur from the dry break fitting on the hose. Put the discharge of the hose
into a measuring container such as a graduated cylinder. Attach the orange pressure hose to the FX2 leak
detector.
2.
Turn the submersible pump on and then off.
3.
Turn the FXT’s Selector Valve slowly to the ‘Pressure Relief’ position as product begins to flow into the
graduated cylinder.
4.
As the pressure falls to 0 psi, record the total volume collected between the holding pressure and zero
pressure.
Values for a typical station should be about 150 ml or less if an FX Series LLD is used. If larger
amounts of product are measured, it is possible air is still present in the system which will prolong
the time required for the LLD to perform the line test.
Using the FX Tester for Testing at the Impact Valve
Some submersible pumps are not equipped with tank vents. In this case, the LLD should be tested from the shear
valve under the dispenser. A Snap-Tap can be installed in the shear valve (see Figure 5). Once the Snap-Tap is
installed, the line can be accessed. A 014-605 fitting must be installed on the black discharge hose to allow flow
to occur into the container.
Snap Tap connectors shall not be left permanently installed into the impact/shear valves and must be
removed upon completion of testing.
NOTE
NOTE
