Procedures & Alarms

Milestones

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

1. Set N2 Feed Air Compressor Standby, Start, and Stop Pressure.
2. Start N2 Feed Air Compressor and Set to Auto.
3. Reset N2 Feed Air Compressor on Alarm.
4. Start Portable Multi Gas Detector.
5. Operate IS IBS Valves in Manual Mode and Reduce Oxygen Content by Venting.
6. Check All Vent Mast Sampling Points.
7. Oxygen Content < 2%.
8. Set IS IBS Valves to Auto.
9. Set IBS and IS PID Set Points and Switch to Auto.

10. Set Valve CN511 and CN511 PID to Auto.

• Assessment Phase – Operational flow and Assessment:

11. Completed IS IBS Conditioning of Tanks.

Alarms & Remarks

Alarm Condition	Alarm Time	Alarm Level	Alarm Title	Alarm Description	Action
Buffer Tank Pressure Low and N2 Feed Air Compressor Not In Auto		High	Start N2 Feed Air Compressor	Start the N2 feed air compressor immediately	–
		Remark	IS IBS Filling Started	IS IBS Filling is working on auto mode, but actual scenario will be using manual valves or auto valves in manual position till the o2 level is less than 2% or as per company’s minimum o2%.
		High	N2 Feed Air Compressor 2 Tripped	Reset the feed air compressor 2 and continue the process.
		High	Critical Operation	This Operation is critical, therefore it should be done with atmost care, This exercise has been created for knowledge purposes only, actual operation may vary as per the preveiliing conditions.Nitrogen supply will be from shore side and the usage will be maximum.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Step By Step Procedure:

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

Set N2 Feed Air Compressor Standby, Start, and Stop Pressure

1. 1. Navigate to the Compressor Settings Page.
   2. Set the following pressures:
      • Standby Pressure: 6.5 bar
      • Start Pressure: 7.5 bar
      • Stop Pressure: 9.5 bar

Start the N2 Feed Air Compressor and Set to Auto

1. 1. Click on the Compressor Icon to open the control pop-up.
   2. In the pop-up, click Start to initiate the compressor.
   3. Once started, set the mode to Auto to enable automatic pressure regulation.

Reset N2 Feed Air Compressor on Alarm

1. 1. If an alarm is triggered, click on the Compressor Icon to open the control pop-up.
   2. In the pop-up, click Reset to clear the alarm and restore normal operation.

Start Portable Multi Gas Detector

1. 1. Navigate to the MISCELLANEOUS EQUIPMENT page using the side menu.
   2. Press and hold the Power Button on the Portable Multi Gas Detector for 2 seconds until it powers on.

Operate IS IBS Valves in Manual Mode and Reduce Oxygen Content by Venting

1. 1. Set the IS IBS Valves to Manual Mode.
   2. Adjust the valve openings as follows:
      • Open these valves to 100%:
        CN107, CN108, CN207, CN208, CN307, CN308, CN407, CN408
      • Open these valves to 70% or above:
        CN105, CN106, CN205, CN206, CN305, CN306, CN405, CN406
   3. Monitor the venting process to ensure oxygen content decreases.

Check All Vent Mast Sampling Points

1. 1. Inspect all Vent Mast Sampling Points to confirm that oxygen levels are decreasing as expected.
   2. Record readings to ensure the oxygen level is reducing from 20.9% to less than 2%.

Oxygen Content < 2%

1. 1. Wait until the oxygen content drops to less than 2%.
   2. Once this milestone is achieved, proceed to the next step.

Set the IS IBS Valves to Auto

1. 1. Change the mode of the following valves to Auto:
      CN105, CN106, CN107, CN108, CN205, CN206, CN207, CN208, CN305, CN306, CN307, CN308, CN405, CN406, CN407, CN408
   2. Verify that all valves operate automatically.

Set IBS and IS PID Set Points and Switch to Auto

1. 1. Set the following PID Set Points:
      • IBS Exhaust SP: 0.80
      • IBS Supply SP: 0.70
      • IS Exhaust SP: 0.50
      • IS Supply SP: 0.30
   2. Once set, switch all PIDs to Auto Mode for automatic control.

Set Valve CN511 and CN511 PID to Auto

1. 1. Set CN511 PID to Auto.
   2. Set CN511 PID SP to 50.
   3. Change Valve CN511 to Auto Mode for automatic operation.

 

• Assessment Phase – Operational flow and Assessment:

Completed IS IBS Conditioning of Tanks

1. 1. Allow the IS IBS spaces to fill with nitrogen.
   2. Once nitrogen fully fills the spaces, the IS IBS Conditioning of Tanks process is complete.