Testing Procedures
Operating Test - Pressure Relief
11
3.
Operate the submersible pump. Observe that line pressure will rise to a constant level and pause there
momentarily. At this point, a slight drop on the pressure gauge may be observed followed by an immediate
sharp increase to full line pressure.
For FX Series leak detectors, the constant level (metering pressure) will be approximately 8 to 16 psi (55 -
110 kPa). Full line pressure of approximately 25 to 40 psi (172 - 276 kPa) will also be observed, determined
by the size of the submersible pump and the product it is pumping.
4.
Using a stopwatch, observe the approximate opening time in seconds from pump start (zero pressure) to full
pump pressure, 25 to 40 psi (172 - 276 kPa), as being approximately 2.0 to 3.5 seconds for the FX Series
LLD. Longer opening times may be indicative of air in the system, system resiliency or a small leak. See Red
Jacket publications RJ-5191, and the mechanical leak detector manual.
5.
Record opening time.
6.
Turn off the submersible pump.
Operating Test - Pressure Relief
1.
With the FXT’s Selector Valve to the ‘Pump/Line Pressure’ position, observe holding pressure of functional
element. If a standard functional element is used, a holding pressure of between 8 to 20 psi (55 - 138 kPa) is
normally observed. If a precision functional element is used, a holding pressure of about 11 to 13.5 psi (76 -
93 kPa) should be observed. Adjustable functional element models manufactured after February 1995 are also
factory set at 11 to 16 psi (76 - 110 kPa). The holding pressure of approximately 19 to 25 psi (131 - 172 kPa)
should be observed when testing The Red Jacket pump.
2.
Record the holding pressure under pressure relief test on the sample test chart.
3.
Adjustable functional element models may have their relief pressures changed by turning down the adjusting
screw to increase pressure and turning the adjusting screw upward to decrease relief pressure. The adjusted
holding pressure may be observed as in Step 1.
Pump Operation
The FXT may be used to check pump pressure. With the orange hose connected to the FX2 Series LLD port, the
pressure being delivered by the pump may be observed. The FXT’s Selector Valve must be turned to the ‘Pump/
Line Pressure’ position.
Refer to Table 2 for Red Jacket Pump operating pressures.
Table 2. Red Jacket Pump Operating Pressures
Model
60 Hz
Model
50 Hz
PSI (kPa)
PSI (kPa)
Gas
Diesel
Gas
Diesel
1/3 HP
25 (172)
28 (193)
3/4 HP
30 (207)
34 (234)
3/4 HP
28 (193)
32 (221)
1-1/2 HP
32 (221)
36 (248)
1-1/2 HP
30 (207)
34 (234)
X4 - 1-1/2 HP
40 (276)
45 (310)
X3 - 1/1/2 HP
43 (297)
49 (338)
2 HP
43 (297)
49 (338)
2 HP
43 (297)
49 (338)
