Procedures & Alarms

Milestones:

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

1. Open Required Valves for Line Up
2. Prepare Required Generators for Use

• Assessment Phase – Operational flow and Assessment:
  

3. Start Spray Pump in Cargo Tank 4
4. Stop Spray Pump in Cargo Tank 4
5. Achieve Required Temperatures on Liquid Header

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Actions During Exercise:

Deviation from Exercise:

• After starting or resuming the line cooldown, do not open any non-required valves or close any required valves.
• A caution message will prompt the user to undo the last action.
• Failure to correct this will terminate the exercise.

High Crossover Pressure:

• During line cooldown, if crossover pressure reaches 4 bar, the user will be prompted to open valve CL400 to reduce the pressure.
• If the pressure reaches 5 bar and CL400 has not been opened, the exercise will terminate.

Liquid Entering the Tank:

• When CL400 is opened (max 10%) to reduce crossover pressure, liquid will start entering the tank.
• The user will receive a warning to close CL400. If this is not done within 1 minute, the exercise will terminate.

Close Tank Filling Valves CL200, CL300, CL400:

• At 3 minutes into the exercise, the user must close CL200, CL300, and CL400. Failure to do so will terminate the exercise.

Keep Tank Filling Valves CL100 and CL400 Open:

• At the 12-minute mark, the user will be warned to keep CL100 and CL400 open. Failure to keep these valves open will cause the exercise to terminate.

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Alarms & Remarks

Alarm Condition	Alarm Time	Alarm Level	Alarm Title	Alarm Description	Actions
		remark	Started Line Cooldown	Started cooling the liquid lines.
		caution	Open Filling Valves	Keep the filling valves CL100 and CL400 open.
		remark	Increase Spray Pump Flowrate	Increase and maintain spray pump flow rate between 50 to 55.
		caution	Close Tank Filling Valves	Close the filling valves CL200, CL300, and CL400.
		caution	Close All Filling Valves	Close filling valves CL100 and CL400.
		remark	Line Cooldown Completed	The spray pump can be stopped.
		caution	Open Cargo Tank 4 Valves	Keep valves CS400 and CS404 open.
		caution	High Cross Over Pressure	High cross over pressure in liquid lines, open filling valve CL400.
		caution	Close Valve CL400	Close filling valve CL400 to fill up the liquid line.
		caution	Deviation Detected	Deviation from the exercise is detected, undo your last action.

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Step By Step Procedure

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

Open All Required Valves for Line-Up:

1. CG100 – Open
2. CG101 – Open
3. CG200 – Open
4. CG201 – Open
5. CG300 – Open
6. CG301 – Open
7. CG400 – Open
8. CG401 – Open
9. CG075 – Open
10. CG701 – Open
11. CG702 – Close & Auto
12. CS704 – Open
13. CS705 – Open
14. CS706 – Open
15. CS707 – Open
16. CS071 – Open
17. CS072 – Open
18. CS700 – Open
19. CS701 – Open
20. CL107 – 100%
21. CL207 – 100%
22. CL307 – 100%
23. CL407 – 100%
24. CL100 – 100%
25. CL200 – 100%
26. CL300 – 100%
27. CL400 – 100%
28. CS401 – Between 25% and 30%
29. CS403 – 100%

 

Prepare Required Generators for Use:

• Navigate to the PMS page through the side navigation or click on the “number of generators running” indicator on the Cargo Tank 4 page.
• Turn on one of the three generators not currently running. (One generator is already running by default.)

 

• Assessment Phase – Operational flow and Assessment:

Start the Spray Pump in Cargo Tank 4:

1. Open Valve CS401 to 25-30%.
2. Open Valve CS400 to 95% or greater.
3. Ensure two or more generators are running (one is default).
4. Close CS403 (Spray Pump Master Valve) to 5% or less.
5. Once these conditions are met, start the spray pump.

Starting the Line Cooldown:

1. After lineup and starting the spray pump, open Master Valve CS403 to 100%.
2. Close Return Valve CS400 to 0%.
3. Once these actions are completed, the cooldown process begins, and a remark will be issued.

Actions at the 3-Minute Mark:

• At the 3-minute mark, the user will be warned to close CL200, CL300, and CL400.
• Once closed, the tank pressure will decrease by 0.3 kPa per minute, while crossover pressure will increase from 2 to 5 bar.

Managing Crossover Pressure at 4 Bar:

• When crossover pressure reaches 4 bar, the user must open CL400 for 20 seconds to reduce the pressure.
• Failure to open CL400 will result in exercise termination once pressure reaches 5 bar.

Pressure Management:

• After closing CL400, the crossover pressure will rise again. If it reaches 4 bar, repeat the process of opening CL400 for 20 seconds.

Actions at the 12-Minute Mark:

• At the 12-minute mark, keep CL100 and CL400 open.
• Crossover pressure will be maintained at 2 bar while tank pressure increases by 0.3 kPa every minute.

At the 14-Minute Mark:

• The user will be warned to stop the spray pump in Cargo Tank 4.
• Navigate to the Cargo Tank 4 page to stop the pump.
• After stopping the pump, the user will be prompted to close the filling valves in all tanks.

Completion of the Exercise:

• After closing the filling valves, open CS400 and CS404.
• The exercise is complete once the liquid header forward temperature reaches -120°C, the spray pump is stopped, and the required valves are opened.

Proper line up for line cooldown at sea: