What is the procedure for testing cargo alarms on LPG vessel?

asked 29 Apr, 15:08

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KnowledgeBase
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Cargo related alarms must be tested prior cargo operation
Below procedure is for Fully Pressurized LPG Carrier

  1. Cargo tank High Pressure alarm setpoint = 18.0 bars
    1. Close the valve leading from the tank to the pressure gauge.
    2. Drain the cargo pressure in the line between the pressure gauge and sampling point valve.
    3. Introduce nitrogen into the line using regulator set to max pressure of 20 bars.
    4. 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.
    5. High pressure alarm will also activate the ESD (shutdown).
  2. Cargo tank High/Low Temperature alarm setpoint lower = 0° C, setpoint upper = 45° C
    1. Open the gauges panel .
    2. Open the bottom temperature gauge.
    3. Adjust the black lever indicator using screw driver to the red lever at 45°C. The High Temp alarm will activate.
    4. Adjust the black lever indicator using srew driver to the yellow lever 0°C. The Low Temp alarm will activate.
    5. High and low temp alarms do not activate ESD.
  3. Cargo Tank High Level Alarm setpoint = 96%
    1. Open the cargo system monitoring panel inside the CCR.
    2. Disconnect the terminal from the circuit to obtain the High Level Alarm. Some systems fitted with special test button for this purpose.
    3. Reset the emergency stop upon hearing the alarm.
  4. Cargo Tank High High Level Alarm and indicator (if applicable) setpoint = 98%
    1. Set the indication of liquid high-high level alarm to obtain the alarm OR
    2. Disconnect the terminal from the circuit to obtain the High High Level Alarm. Some systems fitted with special test button for this purpose.
    3. Reset the emergency stop upon hearing the alarm.
  5. High Level Alarm in Flash Tank
    1. Open the terminal box of the float gauge of the flash tank.
    2. Disconnect the terminal from the circuit to obtain the High Level Alarm. Some systems fitted with special test button for this purpose.
    3. Reset the alarm in the panel upon hearing the alarm.
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answered 29 Apr, 15:32

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SeamenExchan...
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