Procedures & Alarms

Milestones

• Learning and Training Phase – Pre-Requisites for the start of operation:

1. Configure the Correct Setting for the ESD.
2. Start the Manifold Water Curtain.
3. Prepare Gas Instruments for Use.
4. Prepare LNG Vaporizer for Use.
5. Connect Manifold Arm Spool Piece.
6. Open Required Valves for Line-Up and Connect Spool Pieces.

 

• Assessment Phase – Operational flow and Assessment:

7. Start Gassing-Up with Minimum Flow of 10m³/h.
8. Achieve 40°C in LNG Vaporizer Outlet Temperature.
9. Check All Gas Sampling Points.
10. Monitor Vapour Outlet No.1 Vent.

Actions taken during the exercise

Deviation from Exercise

• After starting or resuming the cooldown, the user must not open any non-required valves or close any required valves. If this happens, a caution message will appear, instructing the user to undo the previous action.
• If the user fails to correct the action, the exercise will be terminated.

Not Maintaining the Inlet and Outlet Flow

• The user must ensure that the LNG vaporizer outlet flow and vapor to atmosphere flow are maintained between 11,500 m³/h and 12,500 m³/h.
• If the flow deviates from this range, alarms will be triggered, with a high-priority alarm issued if the issue persists.
• If the user cannot restore the flow, the exercise will be terminated within one minute.

Note: To maintain the LNG vaporizer outlet flow, adjust Valve CS903 in combination with the Flow from Shore and
to maintain the vapor-to-atmosphere flow, adjust Valve CG702 as needed.

Not Opening the Warm-Up Heater Bypass Valve

• During the initial phase of the exercise, the user will be prompted to open the outlet bypass valve of the LNG vaporizer.
• If the valve is not opened within 15 seconds, an LAHH alarm will be triggered.
• The user will have one minute to open the valve. If the valve is not opened in time, the exercise will be terminated.

 

Alarms & Remarks

Alarm Condition	Alarm Time	Alarm Level	Alarm Title	Alarm Description	Action
		remark	Preparing Of LNG Vaporizer	Usually, the LNG vaporizer is properly prepared 3 hours before the operation.
		remark	Increase LNG Flow rate	Vapor blocks might be there inside the lines, increasing the LNG flow rate from shore to 15 m³/h.
		remark	Open LNG Vaporizer Bypass valve	Open the LNG Vapourizer Bypass valve immediately.
		remark	Open The Gas Detector	Open the gas detector sampling point on the liquid line in any of the 4 tanks.
		remark	Increase LNG Vaporizer Outlet Temperature	Increase the outlet temperature of the LNG Vaporizer to 40°C.
		remark	Valve CS904 To Auto Mode	Set the valve output value to 40 and change the valve to auto mode.
		caution	Maintain LNG Vaporizer Outlet Vapour	Maintain the LNG vaporizer outlet vapor flow between 5000 kg/h to 6750 kg/h.
		caution	Maintain LNG Vaporizer Flow And Vapour Flow To Atmosphere	Maintain LNG vaporizer outlet flow and vapor flow to the atmosphere between 11500 kg/h to 12500 kg/h.
		caution	Deviation Detected	Deviation from the exercise is detected, undo your last action.

Step-by-Step Procedure.

• Learning and Training Phase – Pre-Requisites for the start of operation:

1 – Configure the Correct Setting for the ESD

1. Set the Ship/Shore Link Selector Switch to Use.
2. Set the Pneumatic Selector Switch to Bypass.
3. Set the ESD Port Selector Switch to Loading.
4. Set the ESD Mode Switch to Normal.

2 – Start the Manifold Water Curtain

• To start the water curtain, go to the Miscellaneous Equipment page and activate either the bilge pumps or the fuel gas pumps. This will activate the water curtain.

3 – Prepare Gas Instruments for Use

• To start the gas instruments, go to the Miscellaneous Equipment page and activate the portable multi-gas detector by holding the power button for 5 seconds.

4 – Prepare LNG Vaporizer for Use

• Open both the inlet and outlet valves of the LNG vaporizer to prepare it for use.

5 – Connect Manifold Arm Spool Piece

• Locate the highlighted manifold arm positioned above the liquid manifold.
• Click on the highlighted arm to begin the connection process.
• Once all required arms are successfully connected, the milestone will be marked as completed.

6 – Open Required Valves for Line-Up and Connect Spool Pieces

Open the following valves:

• CL031, CS031, CS072, CS701, CS702, CS931, CS932, CG932, CG707, CG100, CG101, CG200, CG201, CG300, CG301, CG400, CG401, CL107, CL207, CL307, CL407, CL100, CL200, CL300, CL400, CL700, CS903, CS904

And connect the spool piece below the valve CL700.

 

• Assessment Phase – Operational flow and Assessment:

7 – Start Gassing-Up with Minimum Flow of 10m³/h

• Once all previous milestones are completed, the flow from shore will become available on the control panel.
• Set the flow to 10 m³/h to initiate the gassing-up process.

  Note: To adjust the flow, enter the desired value in the Flow from Shore field on the control panel. You can also use Valve CS903 in combination with the Flow from Shore to control the flow more effectively.

8 – Achieve 40°C in LNG Vaporizer Outlet Temperature

• After the gassing-up process begins, the user will receive an alarm to reduce the outlet temperature.
• Decrease the temperature to 40°C.

9 – Check All Gas Sampling Points

• Navigate to the main tank pages and check all gas sampling points inside each tank to ensure they are functioning correctly.

10 – Monitor Vapour Outlet No.1 Vent

• Check the gas sampling point in the liquid line and verify the LNG vapor properties in the gas detector.
• Once the LNG vapor properties are visible on the gas detector, the exercise is complete.

 

Proper lineup for gassing up step 1: