A Guide to Shipping Tanks, Silos, & Pressure Vessels Globally

The global transport of large industrial tanks, silos, boilers, and pressure vessels is one of the most complex, high-stakes challenges in project logistics. These units are the critical-path components for oil and gas, renewable energy, chemical processing, and manufacturing projects. They are invariably classified as Out-of-Gauge (OOG) and Heavy Lift, and their inherent cylindrical shape creates significant, specialist handling risks. A single error in lifting or securing can lead to catastrophic damage, multi-million-pound project delays, and essential safety hazards.

This is not freight. This is an engineering-led operation that demands a partner with proven, hands-on experience. Ocean Cargo, with over 25 years of expertise in managing high-consequence project cargo, provides this specialist, end-to-end service. We manage every variable, from the initial route survey and lift-plan engineering to the final, safe delivery at your global project site, ensuring your high-value assets arrive on schedule, on budget, and in perfect condition.

The Core Challenge: Engineering-Led Handling (Crushing & Rolling Risk)

Transporting a tank, silo, or pressure vessel is a unique project defined by its significant technical challenges. Ocean Cargo's planning process is designed to mitigate these specific risks from day one.

1. The Lifting Risk: "Crushing the Shell"

A tank or vessel's shell is not designed to be a lifting point. Its strength is in its cylindrical form.

• The Risk: Lifting a tank incorrectly (e.g., with angled slings wrapped around the body) can apply horizontal, compressive (crushing) force to the shell, which can buckle the unit, crack welds, or damage internal linings (e.g., glass or refractory).
• The Solution: We only lift from the manufacturer-designated lifting lugs or trunnions. For long or heavy vessels, we mandate the use of custom-specified spreader bars. These bars ensure the lifting slings are perfectly vertical, applying the lift force only to the designated strong points and completely preventing any crushing force on the delicate shell.

2. The Securing Risk: "Rolling on the Deck"

A cylindrical object on a flat surface (like a trailer or a ship's deck) is inherently unstable and presents a major rolling risk.

• The Solution: We never place a cylindrical vessel on a flat surface. Ocean Cargo manages the design and fabrication of custom-built "cradles" or "saddles". These are engineered steel or ISPM15-compliant timber structures, custom-fit to the exact contour of the vessel. The tank rests securely in these, creating a stable, flat base for transport. This cradle is then lashed, choked, or welded (sea-fastened) to the transport platform.

3. The Inland Risk: Extreme OOG (Height & Width)

The "first and last mile" on the road is often the highest-risk part of the journey. The cargo's extreme height and width require meticulous planning.

• The Solution: We conduct detailed inland route surveys before the project begins. We check the entire route for bridge clearances, overhead power lines, tunnels, and road width restrictions. Ocean Cargo manages the complex permits, police escorts, and even the temporary removal of street furniture to ensure a safe, legal, and viable inland passage.

How Ocean Cargo Manages Tank & Silo Logistics End-to-End

Ocean Cargo provides a complete, door-to-door project management service. We act as your single point of accountability, orchestrating every stakeholder in the complex logistics chain. Our process is built on 25+ years of proven project cargo experience.

1. Initial Enquiry & Quotation: You contact us with the vessel's details (technical drawings, dimensions, weight, centre of gravity, lifting points, and collection/delivery postcodes). Our project team analyses the data and begins the route survey.
2. Booking and Planning: Upon your acceptance, we provide a complete transport plan. We book vessel space (Break Bulk or Ro-Ro) and obtain all road permits and escorts. We also manage the engineering and fabrication of the custom cradles.
3. Collection and Preparation: We arrange for specialised multi-axle trailers to collect the unit. We oversee the spreader bar lift onto the trailer and the securing for safe road transport.
4. Export Formalities: Our in-house customs compliance team prepares and files the export declaration and collates all necessary documents (e.g., applying for an ATA Carnet for temporary moves).
5. Port Operations and Sea Transit: The unit is delivered to the port and professionally lifted (using spreader bars). Our specialist team secures it in its cradle and performs the full lashing or sea-fastening operation. We monitor the voyage and provide you with tracking updates.
6. Import Clearance: Before arrival, our partners at the destination use the pre-lodged documents to file the import declaration, ensuring immediate clearance upon arrival.
7. Final Delivery: Once cleared, the unit is lifted onto local specialised transport (which has also been route-surveyed) and delivered directly to the final project site, as per the pre-agreed delivery schedule.
8. Proof of Delivery (POD): We provide a final POD confirming your unit has arrived safely.

Transport Modes for Tanks and Silos

Ocean Cargo is multimodal. We do not force your cargo into one solution; we engineer the solution that provides the best balance of safety, cost, and speed.

Sea Freight: The Primary Mode for OOG & Heavy Lift

Sea freight is the most cost-effective and practical solution for large tanks, silos, and industrial boilers. The specific method is critical:

• Out-of-Gauge (OOG) on Flat Racks: This is the most common method. The tank is laid horizontally in its custom-built cradle and expertly secured to a 20ft or 40ft flat rack container. This allows it to be shipped on a standard container vessel, offering the most frequent and flexible schedules.
• Break Bulk Shipping: For the largest vessels that are too wide or heavy for a flat rack. The unit is lifted (Lift-On/Lift-Off or Lo-Lo) directly onto the deck or into the hold of a specialised Break Bulk vessel. This is the ultimate solution for hefty lift cargo. Ocean Cargo can manage a full or partial vessel charter for your project.
• Roll-On/Roll-Off (Ro-Ro): If the tank or silo is secured to a specialist MAFI or modular trailer, it can be "rolled" onto a Ro-Ro vessel. This is an excellent, safe option as it minimises lifting operations, which are a primary source of risk.

Air Freight: For Critical Components

While the main vessel cannot be air-freighted, its critical components (e.g., specialist valves, sensors, control systems for a pressure vessel) can. If a project is waiting on a part, Ocean Cargo’s 24/7 air freight team can move urgent components globally in 24-48 hours, preventing costly project downtime.

Navigating Global Customs & Compliance

Shipping high-value, specialist equipment globally requires deep customs expertise. Ocean Cargo's in-house customs compliance team manages this entire process, preventing costly border delays.

• HS Code Classification: We ensure the correct HS (commodity) code is used for your unit (e.g., 7309.00 for steel tanks, 8402.11 for watertube boilers, 8419.89 for some pressure vessels), which is vital for calculating import duties and taxes.
• Temporary Import: If your tank is being shipped internationally for a specific project, for repair, or for testing, it should not be subject to full import duties and VAT. Ocean Cargo manages the "Temporary Import" (TI) customs procedure, lodging the necessary bond or carnet with local customs to allow the vessel to enter duty-free for a set period.
• Incoterms: For high-risk, high-value project cargo, Incoterms are critical. We provide expert advice, often recommending a DAP (Delivered at Place) solution where Ocean Cargo manages the entire complex, high-risk journey from your door to the final project site.

Route Planning, Transit Times, and Cost Drivers

A smart logistics plan considers all variables that affect your timeline and budget.

Route Planning and Transit Times

The total door-to-door transit time is influenced by:

• First/Last Mile Logistics: Securing road permits for OOG and Heavy Lift cargo (due to height and width) can take several weeks. The inland journey itself is slow and often restricted to night-time or weekend travel.
• Port Dwell Time: Time is required at the port for the complex, pre-planned lifting, cradling, and securing operations.
• Vessel Schedule: Breakbulk sailings are far less frequent than container vessel sailings. Our project team plans the entire timeline around the most reliable vessel schedule.

Key Pricing Factors

We provide fully transparent, all-inclusive project quotations. The key drivers of your cost will be:

• Volume and Dimensions: OOG cargo is priced based on the "lost" container slots it occupies. A wide or tall silo on a flat rack will be charged for all "lost" slots to the sides and above.
• Weight: Heavy-lift cargo incurs significant port surcharges for the use of special heavy-lift cranes.
• Ancillary Costs: These are a significant component. Our quotes include all costs for route surveys, inland escorts, police permits, crane hire, cradle fabrication, and lashing materials/labour.

Digital Visibility, Milestones, and Communication

When your most valuable, project-critical assets are in transit, transparent and proactive communication is essential. Ocean Cargo provides a dedicated 24/7 project manager as your single point of contact, ensuring you always speak to someone who knows your shipment's exact status.

Key Tracking Milestones

Our system tracks every critical event, including:

• Booking Confirmation: Your project plan, route survey, and method statements are approved.
• Cargo Collected: Your tank is on its way from the factory on a specialist trailer.
• Secured at Port: We provide photographic confirmation that the unit is correctly cradled and lashed/secured.
• Export Customs Cleared: Your export declaration is approved.
• Vessel Departed: Your cargo is on the water.
• Vessel Arrived: Your cargo has reached the destination port.
• Import Customs Cleared: Your shipment has been released by local customs.
• On-Carriage for Delivery: The final-mile specialist transport is loaded and en route (post-route survey).
• Proof of Delivery (POD): The shipment is complete, and a signed POD is available.

Sustainability Levers in Tank and Silo Transport

Ocean Cargo is committed to providing responsible logistics solutions, even for the most complex heavy-lift projects. We support your sustainability goals by:

• Modal Choice: We prioritise sea freight (the most carbon-efficient mode per tonne-mile) for all tanks and silos, reserving air freight only for genuine, project-critical emergencies.
• Carrier Selection: We partner with shipping lines and carriers that are investing heavily in sustainability, from using Very Low Sulphur Fuel Oil (VLSFO) to pioneering new technologies like LNG-powered vessels.
• Route Optimisation: Our detailed route planning not only ensures safety but also minimises transport distance and fuel burn, avoiding unnecessary mileage and idling time at borders or due to unforeseen obstacles.