Cargo related alarms must be tested prior cargo operation
Below procedure is for Fully Pressurized LPG Carrier
- Cargo tank High Pressure alarm setpoint = 18.0 bars
- Close the valve leading from the tank to the pressure gauge.
- Drain the cargo pressure in the line between the pressure gauge and sampling point valve.
- Introduce nitrogen into the line using regulator set to max pressure of 20 bars.
- When the pressure in the line between the pressure gauge and sampling point reaches 18 bars the High Pressure alarm should be sounded at the control panel in the CCR.
- High pressure alarm will also activate the ESD (shutdown).
- Cargo tank High/Low Temperature alarm setpoint lower = 0° C, setpoint upper = 45° C
- Open the gauges panel .
- Open the bottom temperature gauge.
- Adjust the black lever indicator using screw driver to the red lever at 45°C. The High Temp alarm will activate.
- Adjust the black lever indicator using srew driver to the yellow lever 0°C. The Low Temp alarm will activate.
- High and low temp alarms do not activate ESD.
- Cargo Tank High Level Alarm setpoint = 96%
- Open the cargo system monitoring panel inside the CCR.
- Disconnect the terminal from the circuit to obtain the High Level Alarm. Some systems fitted with special test button for this purpose.
- Reset the emergency stop upon hearing the alarm.
- Cargo Tank High High Level Alarm and indicator (if applicable) setpoint = 98%
- Set the indication of liquid high-high level alarm to obtain the alarm OR
- Disconnect the terminal from the circuit to obtain the High High Level Alarm. Some systems fitted with special test button for this purpose.
- Reset the emergency stop upon hearing the alarm.
- High Level Alarm in Flash Tank
- Open the terminal box of the float gauge of the flash tank.
- Disconnect the terminal from the circuit to obtain the High Level Alarm. Some systems fitted with special test button for this purpose.
- Reset the alarm in the panel upon hearing the alarm.