Gas carrier - Loading operations | Lpg ship loading operations | cargo loading operations | tankers

Summary

This video script outlines the procedural steps for safely and efficiently loading cargo onto a vessel. It covers essential pre-arrival checks, including the verification of valve statuses and the coordination between ship and shore. The script emphasizes the importance of managing cargo tank pressure, monitoring temperatures, and ensuring correct loading rates to prevent over-pressurization. Key safety measures are highlighted, such as avoiding the high-level alarm and automatic ESD activation. It also includes instructions for managing boil-off gas post-loading to ensure operational efficiency.

Takeaways

• 😀 Ensure all pre-arrival preparations are completed according to checklists and agreements before cargo loading.
• 😀 Duty officer must verify the status of valves and lineup on deck and in the CCR according to the loading plan.
• 😀 Once line setup is confirmed and valves are opened (except the liquid manifold valve), inform shore of the vessel's readiness to load.
• 😀 The chief officer must confirm with the gas engineer that the relic compressors are ready to control tank pressure before loading begins.
• 😀 Once shore confirms, the liquid manifold valve is to be opened to 25, and the loading process is started for the shore arm.
• 😀 Chief officer and duty officer must closely monitor cargo tank pressure and liquid level during the loading process.
• 😀 Cool down duration for the shore arm can vary from 30 minutes to an hour, and the vessel must ensure shore's confirmation before opening the liquid manifold valve fully.
• 😀 The initial phase of loading generates a large volume of gas, requiring attention to prevent over-pressurization of cargo tanks.
• 😀 Loading rate should be increased after the cargo tank pressure stabilizes, with continuous monitoring of pressure, temperature, and liquid levels.
• 😀 The filling limit of cargo tanks should not exceed 98% volume, with allowances for supercooled cargo, and an emergency alarm will trigger if the level reaches 99.5%.

Q & A

What is the first step in the pre-loading preparation process?

The first step is to ensure that all pre-arrival preparations are completed according to the checklists and agreements between the ship and shore during the pre-cargo operations meeting.

What must the duty officer verify before commencing loading?

The duty officer must check the status of the valves and ensure the proper lineup on deck and in the CCR as per the loading plan.

What should be done once the line setup has been confirmed?

Once the line setup has been confirmed, and all required valves are opened, except the liquid manifold valve, the shore should be advised of the ship’s readiness to load cargo.

Who needs to confirm the readiness of the relic compressors, and what is their role?

The chief officer must confirm with the gas engineer that the relic compressors are in readiness to control tank pressure before commencing loading.

What is the role of the chief officer and duty officer during the loading process?

The chief officer and duty officer must closely monitor cargo tank pressure, liquid level, and ensure proper operations while loading. They must also ensure that the loading rate is adjusted accordingly.

How long does it typically take to cool down the shore arm before loading starts?

The cooldown duration for the shore arm can vary from 30 minutes to one hour or more, depending on the situation.

What happens when the shore arm cooldown is completed?

Once the shore arm cooldown is completed and confirmed by the shore, the vessel must open the liquid manifold valve fully in agreement with the shore.

What is a crucial factor to avoid during the start of loading?

At the start of loading, a great volume of gas is generated, and it is important to avoid over-pressurization of the cargo tanks.

What should be done to prevent a mis-operation of the loading process?

To avoid mis-operation, it is essential to monitor the level gauge carefully and ensure that the loading rate is suitably reduced during topping off.

What should the liquid level in the port and starboard cargo tanks be during loading?

The liquid level in the port and starboard cargo tanks should be maintained at the same level during the loading process.

What happens if the tank liquid level reaches 99.5% volume?

If the tank liquid level reaches 99.5% volume, an emergency high-level alarm will sound, and an ESD (Emergency Shut Down) will automatically activate, closing the manifold valves.

What happens after the loading process is completed?

After loading, boil-off gas from the tanks is to be re-liquefied by the liquefaction plant.