Merchant Navy Life

⚓ Rudder Trunk on Ships – Hidden Area Where Stowaways Can Hide

🎥 Real Onboard Footage | Merchant Navy Life

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🛠️ Introduction

The rudder trunk is a vertical structure located at the aft part of a vessel.
It houses the rudder stock, which connects the rudder blade to the steering gear system.
This space plays a critical role in maintaining steering control and preventing seawater from entering the hull.

However, because it’s dark, confined, and rarely accessed, the rudder trunk can also become a potential hiding place for stowaways — making it an important part of any vessel’s ISPS security inspections.

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🎬 Real Footage: Inside the Ship’s Rudder Trunk

Here’s a real look inside the rudder trunk of a merchant vessel 👇
🎥 Watch full video (125K+ Views):
👉 https://youtu.be/OgomecK2f8s?si=TM0Sd-7TwkAbMTZS

This real onboard video shows how the rudder trunk looks inside a live ship and why it must be checked as part of stowaway prevention under the ISPS Code.

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⚙️ What Is the Rudder Trunk?
• Connects the rudder stock to the steering gear above.
• Located in the aft peak, just below the steering gear flat.
• Serves as a sealed tunnel to prevent seawater ingress.
• Allows inspection, alignment, and maintenance access.

During dry-dock or inspection periods, this space is checked for corrosion, coating condition, and leakage around the rudder stock gland.

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🚨 Stowaway Risk and Security Checks

Although the rudder trunk is not a space commonly entered by crew, its location and structure make it vulnerable to stowaway attempts, especially in ports with higher risk.

Under the ISPS Code, this area must be inspected and secured as part of stowaway prevention procedures before sailing.

✅ Key checks include:
1. Inspect and lock access to the rudder trunk.
2. Use gas detection before entry if space is enclosed.
3. Record inspections in the ship’s ISPS logbook.
4. Maintain restricted access to the steering gear room and nearby spaces.

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⚓ Maintenance & Safety

To keep the rudder trunk safe and compliant:
• Inspect the rudder stock gland for leaks.
• Verify there’s no seawater ingress.
• Maintain proper coating and lighting.
• Provide temporary ventilation during entry.

These steps ensure both safety and security onboard.

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💡 Conclusion

The rudder trunk is one of those hidden but essential parts that ensure a ship’s steering integrity and overall safety.
This onboard footage gives seafarers and enthusiasts a realistic view of how it looks — and why it must be part of every ISPS and stowaway search before sailing.

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⚠️ Educational Purpose Disclaimer

This content is shared strictly for educational and awareness purposes.
It aims to educate seafarers, cadets, and maritime enthusiasts about ship structure, safety, and ISPS awareness.
No operational secrets or restricted information are shared.

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🌐 Explore More

📘 Read the full article on our website:
👉 https://merchantnavylife.com/rudder-trunk-inside-ship/

🎥 Subscribe on YouTube:
👉 https://youtu.be/OgomecK2f8s?si=TM0Sd-7TwkAbMTZS

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🏷️ Tags

rudder trunk, ship rudder, stowaway search, ISPS code, steering gear, ship security, merchant navy life, tanker maintenance, life at sea

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🔖 Hashtags

🚢 SHIP EDUCTOR SYSTEM – Cargo, Ballast & Bilge Operations Explained 💨

The Ship Eductor System is one of the most reliable and versatile systems onboard tankers. It’s widely used for cargo stripping, ballast water handling, and forecastle bilge drainage — especially in areas where pumps can’t reach the last bit of liquid.

Every Chief Officer, Pumpman, and Deck Cadet should know exactly how this system works — from the motive flow and suction to the discharge and safety checks.

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⚙️ What is a Ship Eductor?
An eductor, also called a jet ejector or venturi eductor, works using the Venturi principle.
A high-pressure motive fluid (usually cargo or seawater) passes through a nozzle, creating a vacuum that sucks liquid from another line and discharges it elsewhere.

✅ No moving parts = Low maintenance + High reliability.

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🛢 Cargo Eductor System (Tankers)
During cargo discharge, when the main pump loses suction, the cargo eductor is used to strip the remaining cargo from the tanks.

💡 Typical Operation:
1️⃣ Cargo from the slop tank is sent through the main cargo pump to the eductor.
2️⃣ The high-pressure flow creates vacuum inside the eductor.
3️⃣ Once vacuum builds (~10 kg/cm²), the suction valve of the cargo tank is opened.
4️⃣ Remaining cargo is sucked out and discharged back into the slop tank.

⚠️ Keep monitoring the slop tank ullage — all stripped cargo returns there.

This system is also used during Crude Oil Washing (COW) to ensure tanks are completely drained before washing.

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🌊 Ballast Eductor System
After deballasting, pumps sometimes lose suction and a few centimeters of water remain in the ballast tanks. On large vessels, that can mean several tons of water — affecting draft, trim, and cargo intake.

That’s when the ballast eductor helps remove the last water through seawater motive pressure via the Ballast Water Treatment System (BWTS).

✅ Always check filters, pressure, and valve line-up before operating.

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⚓ Forecastle Bilge Eductor System
Forward spaces such as the forecastle store, chain locker, and void compartments are drained using a fire main-driven eductor.
Once the fire line valve is opened, suction starts, and when air enters, you’ll hear the sound change — that means bilge water is cleared.

🧭 Commonly used during heavy weather, rain, or drydock.

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🧠 Advantages of Eductors
✔ No moving parts → very low maintenance
✔ Handles dirty or viscous fluids
✔ Safe in hazardous areas (no electrical parts)
✔ Reliable for stripping, ballast, and emergency drainage

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⚠️ Safety Precautions
⚙️ Check motive pressure before operation
🔒 Confirm valve line-up and non-return valves
🚫 Avoid dry running
📈 Monitor suction pressure and slop tank ullage constantly

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🧭 Conclusion
From cargo stripping to ballast removal and bilge drainage, the ship eductor system is a small yet powerful part of every tanker.
Understanding how it works ensures safe, clean, and efficient operations — exactly what defines a professional seafarer.

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📖 Read the full article here 👇
👉 https://merchantnavylife.com/https-merchantnavylife-com-ship-eductor-system/