Procedures & Alarms

Milestones

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

1. Configure The Correct Setting For The ESD.
2. Prepare Both HD Compressors and Generators for use.
3. Run a custody transfer print-out for official tank gauging.
4. Connect Manifold Arm L2,V,L3 and L4.
5. Opened required valves for line up.

 

• Assessment Phase – Operational flow and Assessment:

6. Ramp up completed.
7. Ran Both HD compressors when required.
8. Staggering achieved for all tanks.

• The difference of 40cm achieved between CT1 and CT2.
• The difference of 20cm achieved between CT2 and CT4.
• The difference of 20cm achieved between CT4 and CT3.

Actions taken during the exercise

Failure Conditions for Crossover Pressure and Instantaneous Rate

• If the crossover pressure reaches 4 bar, the user will be warned to increase the filling valve openings.
  • If the pressure reaches 5 bar, the exercise will be terminated.
• If the instantaneous rate of a tank reaches 4000 m³/h, the user will be warned to increase the filling valve openings.
  • If the rate reaches 5000 m³/h, the exercise will be terminated.

Emergency Shut down during operation

During the loading process, a leak may be detected in the liquid line L2. In such a case, the user should navigate to the ESDS System page and activate the ESD Manual Push Button to trigger an emergency shutdown. After resetting the system, the user can proceed with resuming the loading process.

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Alarms & Remarks

Alarm Condition	Alarm Time	Alarm Level	Alarm Title	Alarm Description
After Starting Loading	During The Ramp up every 6th minute this alarm will be thrown	remark	New ship rate 1000m³/h available	Increase ship rate to 1000m³/h.
	Whenever the tank’s instantaneous rate reaches above 4000m3/h	caution	High Pressure In Manifold Lines	High pressure in liquid manifold line, open or increase the filling valve percentage.
	When pressure reaches 14kpa	caution	Start The HD Compressor	High pressure inside the tanks, start the HD compressor.
	When pressure reaches 14.5kpa	caution	Increase HD Compressor Veins	High pressure inside the tanks, increase the HD compressor veins to maintain pressure.
	When pressure reaches 15kpa	caution	Start Another HD Compressor	Start another HD compressor, reduce the veins of HD Compressor 1 before starting another HD compressor.
	When pressure reaches 15.5kpa	caution	Increase The Veins Of Both The HD Compressors	High pressure inside the tanks, increase the veins of both HD compressors to maintain pressure.
	When an unnecessary valve is opened.	caution	Deviation Detected	Deviation from the exercise is detected, undo your last action.
	When difference obtained	Remark	Obtained Level Difference Between CT1 and CT2	Obtained a 40 cm difference between CT1 and CT2. Now, the level difference can range between 35 and 45 cm.
	When difference obtained	Remark	Obtained Level Difference Between CT2 and CT4	Obtained a 20 cm difference between CT2 and CT4. Now, the level difference can range between 15 and 25 cm.
	When difference obtained	Remark	Obtained Level Difference Between CT4 and CT3	Obtained a 20 cm difference between CT4 and CT3. Now, the level difference can range between 15 and 25 cm.
	Crossover Pressure > 4.5 bar	Low/High	High Cross Over Pressure	High cross over pressure in liquid line, increase tank filling valve opening.

Step By Step Procedure

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

1. Configure the Correct Settings for the ESD

To ensure the ESD system is ready:

1. 1. Visit the ESD System page.
   2. Set the following switches:
      • Ship / Shore Link: USE
      • Pneumatic Selector: BYPASS
      • ESD Port Selector: LOADING
      • ESD Mode: NORMAL

Check that the correct lights and indications are ON before moving to the next step.

Milestone 1 (M1)

 

2. Prepare Both HD Compressors and Required Generators for Use

• • The HD Compressors require at least two generators to be operational. Navigate to the PMS page via the side navigation or by clicking the “Number of Generators Running” indicator on the HD Compressor page (High Duty Compressor 1 or 2 in the side navigation).
  • Turn on one of the three generators that is not currently running. By default, one generator will already be running.
  • Once the required generators are running, visit each HD Compressor screen and perform the following:
    • Start the Aux LO Pump.
    • Switch ON the Heater for the Oil Reservoir.
    • Ensure the inlet and outlet valves on both HD compressors are open.

 

3. Run a CTS Report Setup and Activate CTS Status for Official Tank Gauging

• • Navigate to the CTS Main page via the side navigation.
  • Set the ship mode to harbour and filter mode to normal.
  • Fill in the required details in the report data and select loading in the CTS Report under Report and Setup.

 

4. Connect Manifold Arm Spool Pieces

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

 

5. Complete the Lineup by Following the Required Steps

1. 1. Set the Cargo Tank Vapour Valves:
      • Open CG100, CG101 for No.1 cargo tank vapour.
      • Open CG200, CG201 for No.2 cargo tank vapour.
      • Open CG300, CG301 for No.3 cargo tank vapour.
      • Open CG400, CG401 for No.4 cargo tank vapour.
   2. Set the Vapour Line to No.1 Vent Mast:
      • Open the vapour line to No.1 vent mast (CG701).
      • Set CG702 to Auto (No.1 vent mast regulating valve).
   3. Set the Cargo Tank Liquid Valves:
      • Open CL107, CL207, CL307, CL407 for cargo tank liquid branch valves.
      • Open CL100, CL200, CL300, CL400 for cargo tank liquid filling valves.
   4. Set the HD Compressor Valves:
      • Open CG903, CG915 for No.1 HD compressor inlet and outlet valves.
      • Set CG1021 Open & Auto for No.1 HD compressor surge valve.
      • Open CG904, CG916 for No.2 HD compressor inlet and outlet valves.
      • Set CG1022 Open & Auto for No.2 HD compressor surge valve.
   5. Set the Vapour Line Valves:
      • Open CG704 for the vapour line to HD compressors.
      • Open CG900 for the compressor line to the vapour manifold.
      • Open CG071 for the port vapour manifold ESD valve.
   6. Set the Cargo Liquid Manifold Valves:
      • Open CL023, CL033, CL043 for the cargo liquid manifold double-shut valves.
      • Open CL021, CL031, CL041 for the port cargo liquid manifold ESD valves.

After ensuring that the valves are correctly set as per the above list, the lineup will be complete.

Note: Valve CG702 is only available on the Cargo System page and Cargo Tank No.1.

• Assessment Phase – Operational flow and Assessment:

6. Start Loading and Complete Ramp-up

1. 1. Increase the Ship Rate to 1000 m³/h to enable the “Start Loading” button.
   2. Once clicked, the cargo tanks will begin loading LNG at 1000 m³/h.
   3. During the ramp-up process, a new ship rate will be available every six minutes. The user must update the ship rate to the new rate within one minute.
   4. If the rate is not updated as required, the exercise will be terminated.

 

7. Start HD Compressors as per Exercise Requirement

1. 1. When the Cargo Tank Pressure reaches 14 kPa, the user will receive an alarm to start one of the HD compressors.
      • The user must start HD Compressor 1 or HD Compressor 2 from their respective pages.
   2. When the pressure reaches 14.5 kPa, the user will receive an alarm to increase the veins of the running HD compressor to maintain the Cargo Tank pressure.
   3. When the pressure reaches 15 kPa, the user will receive an alarm to start another HD compressor.
      • The user must decrease the veins of the running HD compressor to ZERO in order to start the other HD compressor.
   4. When the pressure reaches 15.5 kPa, the user will receive an alarm to increase the veins of both HD compressors to maintain the pressure.

8. Achieve Staggering Between Cargo Tanks

1. 1. Achieve a 40 cm Difference between CT1 and CT2.
   2. Achieve a 20 cm Difference between CT2 and CT4.
   3. Achieve a 20 cm Difference between CT4 and CT3.

The user should adjust the filling valves to achieve the required level differences between the cargo tanks. Each tank level should be staggered to make the topping-off process easier.

Proper line up for loading ramp up and staggering: