2
GROSS LINE FAIL ALARM
This alarm occurs when a drop in pump-off line pressure, or low
pump-off line pressure is detected.
Probable Causes:
1. The line is leaking
[inspect all visible areas of pipeline, dis-
penser piping, and STP for leakage].
2. The tank is empty.
3. Power to the STP is switched Off - PLLD ONLY.
4.
Partially
clogged functional element (R. Jacket STP)
(Pre 19)
.
5. STP contactor relay not closing or relay sticking - PLLD ONLY.
6. Faulty check valve (FE Petro or SwiftCheck Valve); check relief
pressure; refer to Appendix A, Table II on Page 15.
7. Line length or type programmed incorrectly in the console.
8. Packer-Discharge Seal leaking (Red Jacket STP) - replace
with the correct seal for your application.
9. Dispenser is leaking. External leaks (connections, filters, etc.),
or internal leaks (solenoid valves in dispensers leaking into
nozzle hose, blender valve leaking, etc.)
10.Air in the line
(Pre 19)
.
11.Low or no STP pressure (bad STP, starting capacitor).
12.Incorrect wiring of pump control/transducer - PLLD ONLY.
13.No STP request signal from dispenser. Verify all dispenser
switches are recognized by the console when actuated.
Troubleshooting Guidelines:
Retest line to determine if failure is repeatable or is intermittent. If
the test passes, the problem is intermittent. Items 4, 5, 6, 9, 12,
and 13 are the most common causes of intermittent failures. If
the line fails, close all dispenser emergency shut-off (‘crash’)
valves and retest. If the test passes, the leak is probably in the
dispenser(s).
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