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The Ultimate Guide to Ocean Shipping Containers

Susan Nalevac • Mar 07, 2023

While a shipping container may seem like a simple steel box, they’re much more complex structures. If you want to learn more about ocean shipping containers, check out our ultimate guide below, which details a shipping container’s materials, dimensions, components, and more.

What Are Shipping Containers Made Of?

First, we’ll go over the basics of shipping containers, like what they’re made of. Shipping containers feature a corrugated steel frame, wall panels, cargo doors, and cross members made of corten steel.


Corten steel is different from other materials because it’s weldable and rust-resistant. Naturally, for metal boxes that spend a lot of time traveling over saltwater oceans, there’s a significant advantage to corrosion-resistant steel. Even if there is a chip in the paint of a shipping container, the corten steel may form a thin layer of rust, but no deeper, which can prevent structural damage.


What Are the Dimensions of a Shipping Container?

While shipping containers come in all shapes and sizes, most are dry-rack or standard containers. These standard containers have the same basic structure and dimensions: 20’ x 8’ x 8’6”.


The 20-foot container is the most common length for the standard unit, but there are also 40-foot containers with the same dimensions for buyers to choose from. But length is the only distinction between 20 and 40-foot containers—their widths and heights are universal.


What Are the Components of a Shipping Container?

While shipping containers may seem like simple steel boxes, they contain crucial components that every container owner should know about. The main elements are the corner castings, cross members, doors, and flooring.


Corner Castings

The corner castings of a shipping container are critical to its structural integrity and strength. Shipping containers are constructed so that the corner castings are used by cranes to lift and transport them.


The corners are also the connection points between one container and another—so when containers get stacked on one another, all the weight is on the corners instead of the roofs and floors. Without sound corner castings, a shipping container is much less reliable.


Crossmembers

On the bottom of a shipping container are cross members—strips of corrugated corten steel that are equally spaced and run underneath the container’s floor. The cross members offer structural support for the container and create a space between the ground the container rests on and the container floor.


This extra gap between the ground and floor helps prevent water and moisture from seeping into the container floor from underneath and causing rust. The container’s cross members are essential to the stability of the container and the quality of the floor—if the steel cross members get rusted or damaged, it will likely lead to a sagging or warped floor inside the container.


Cargo Doors

Depending on the type of container, there may be multiple sets of doors in different sizes, but the common standard container features just one set of heavy cargo doors. Cargo doors protect the cargo from weather and thieves with formidable strength and durability.


Shipping container cargo doors feature a unique locking mechanism to prevent theft and create a watertight seal to keep moisture out. If the cargo doors get rusted or damaged, they can be difficult to open/close and destroy the door’s watertight seal or locking mechanics.


Plywood Flooring

Lastly, the inside of an ocean shipping container features marine-grade plywood flooring. While bamboo flooring is slowly gaining popularity, marine-grade plywood is still by far the most common flooring material.


The biggest concern with a container’s flooring is dry rot and mold destroying the plywood, so container owners should always inspect the container floor for any signs of moisture and rust that could damage its structural integrity.


What Are the Different Types of Shipping Containers?

As discussed, there are many different types of shipping containers besides the standard dry-rack construction. Specialty containers are useful when transporting cargo that’s too big, awkwardly shaped, or needs to get unloaded/loaded differently than typical cargo.

Some examples of specialty shipping containers include:

  • Hard-top container
  • Flat-rack container
  • Open-top container
  • Insulated container
  • Refrigerated container
  • Open-side container
  • Container with double doors both ends


What Are the Features of an Ocean Shipping Container?

Due to their materials, construction, and design, ocean shipping containers have many features that make them convenient for worldwide travel, long-term storage, and many other applications.


Easy Portability

The prime feature of an ocean shipping container is that it’s easy to transport. As discussed, shipping containers have standardized dimensions, making them easy to transport and move no matter what port or mode of transportation they take.

Shipping containers are designed for intermodal transportation, meaning they can get transported by truck, rail, sea, and air. Because containers have universal dimensions, they can get transported from a truck to a train and a ship quickly and efficiently.


Weatherproof

Shipping containers must be weatherproof to ensure that the cargo it’s transporting from one port to another worldwide makes it there safely without weather damage. The corrosion-resistant corten steel ensures it can handle salty seawater, and the watertight seal keeps the ocean and weather away from the container’s cargo.


The weatherproof durability and watertight seal of containers also make them beneficial for other non-shipping purposes. It’s one of the many reasons container-based structures for homes and businesses have become such familiar sights.


Long Lifespan

Since shipping containers get constructed with such durable materials, they can serve for over a decade on a shipping line and many decades more on dry land. Typically, a container that’s taken care of will spend around 15 years on a shipping line before it’s retired.

After it’s removed from shipping, containers can get used for container-based structures for homes and businesses and still last for many decades on dry land if they’re well maintained.


Conclusion

We hope our ultimate guide to ocean shipping containers has been informative and helpful. If you’re in the market for a container, Container Management, Inc. has many cargo containers in Houston, TX, for sale and in other locations nationwide.


Contact our expert staff to learn more about shipping containers and to find one that fits your business or personal needs today.

The Ultimate Guide to Ocean Shipping Containers
06 May, 2024
Are you looking to buy a shipping container but can’t decide between new or used ? Do you want to better understand the advantages and disadvantages of choosing either option? Let us help with our overview of the pros and cons of buying your shipping containers both new and used! Our guide describes what to consider when deciding between a new or used shipping container , and the benefits that each unit brings to the table. We address which choice provides better value, and the considerations for each type of container. Considerations for a New Shipping Container Definition of a NEW Shipping Container: When considering a new shipping container, one important point to keep in mind is that shipping containers are manufactured overseas. Therefore, “NEW” shipping containers for sale in the United States have had a one-way trip from overseas, from a port near its manufacturing facility to a U.S. port. In other words, these cargo containers were built overseas, loaded with products bound for the United States, and then unloaded here. This means that NEW shipping containers for sale have had a one-way, loaded move from the overseas manufacturer to the United States. A NEW shipping container is also called a “one-way” or, more commonly, a “one-trip” container. In shorthand, these may be abbreviated as “1-trip” or “1-T.” Better Condition/Appearance The primary appeal of a new container—otherwise known as a “one-trip” container—is that you’re getting a unit in its best possible condition. One consideration when buying new or used shipping containers is the appearance—do you want a shiny new unit, or is it OK if it looks a little weatherworn? If the appearance of the steel container is as significant as its utility to you, a one-trip unit is likely your best option. Longevity Steel shipping containers are built to last decades under brutal conditions crisscrossing the world’s oceans. When you buy a new container, you’re getting a unit in its ideal state. You can be certain it’ll last for the long haul. Used containers can still last for years and even decades with proper maintenance. But if long-term durability is essential for your container, one trip is the way to go. Immediately Ready for Use Are you on a tight schedule and need a container ready for use right now? Your best bet is a one-trip unit that’s had only a one-way loaded move from the manufacturer in Asia and is in ideal condition. When a new container is delivered to you, it’s ready to go immediately with little to no maintenance or repairs needed. Appropriate Use of a NEW Shipping Container All new containers will be suitable for both storage or export. They will also be ready for modification if you choose to repurpose it. Considerations for a Used Shipping Container Definition of a Used Shipping Container: When deciding on the purchase of a used shipping container, you must consider the grade. Licensed surveyors assign used shipping containers to one of three shipping container grades : USED – Cargo-Worthy (also called CW) USED – Wind and Watertight (also called WWT) USED – “As Is” USED – Cargo-Worthy Shipping Containers “USED – Cargo-Worthy” (CW) shipping containers are the best quality USED shipping containers available. Some people refer to Cargo-Worthy containers as seaworthy containers or ocean shipping containers . A “Cargo-Worthy” designation signifies that a qualified shipping container surveyor has inspected the container and certified it as cargo-worthy. You can load a cargo-worthy container for domestic or export use. In other words, the USED – Cargo-Worthy shipping container meets all U.S. domestic and overseas shipping requirements. However, be aware that the shipping container grade does NOT assess the cosmetic appearance of the container. Instead, a licensed surveyor assesses the container for factors related to its structural integrity. (See the 7-Point Container Ocean Certification Checklist .) Therefore, a certified USED – Cargo-Worthy container is structurally sound. It also meets the manufacturer's original factory specifications. If you want to ship materials or products overseas in a used shipping container, it must be Cargo-Worthy. Appropriate Use of a USED – Cargo-Worthy Shipping Container Your USED – Cargo-Worthy container will be suitable for storage or export, or you may repurpose it to meet your unique personal or business needs . USED – Wind & Watertight Shipping Containers Container Management, Inc. guarantees that your USED – Wind and Watertight shipping container will be delivered: Wind and watertight Including a floor without any holes (usually a laminated, marine-grade plywood with steel cross beams underneath) Featuring fully functioning doors Appropriate Use of a USED – Wind and Watertight Shipping Container Your USED – Wind and Watertight container will be suitable for all uses on land: as storage containers or repurposed for innovative uses . USED – “As Is” Shipping Containers At Container Management, Inc., we sell only NEW shipping containers and the top two grades of USED shipping containers: USED – Cargo-Worthy USED – Wind and Watertight We NEVER sell the third grade of USED shipping containers: “As Is.” That’s because we want our customers to appreciate our value and service. We won’t sell you “as is” shipping containers because we deem their inferior quality poor, unpredictable, and unacceptable. Pros of Buying Used Shipping Containers There are many advantages to choosing a used shipping container, but the primary benefits are affordability, durability, and sustainability. More Affordable The primary benefit many owners cite for a used shipping container is that it’s more affordable than the alternative. For many, the difference in condition or appearance between a new or used container is negligible or irrelevant, so why not go easy on your budget and opt for the used unit? Durability A used container may not last as long as a one-trip unit, but it will still serve you well for storage or other purposes for years and even decades to come. If a used container is maintained and cared for properly, there’s every reason to expect it to last at least another 30 to 50 years after purchase. Promotes Sustainability Do you love sustainability and making what’s old new again? You can do just that with a used shipping container! After so many years, a container may no longer be graded suitable for export transport, but it still has a lifetime of utility for storage or other purposes. Whether it’s a shipping container, cars, furniture, or practically anything else, the used option will always be the more environmentally friendly choice. Used shipping containers are still very capable and can get the job done. By deciding on a used container, you use the resources on hand instead of spending time, energy, and materials to create new units. Cons of Buying Used Shipping Containers There are definitely fewer cons compared to the pros of purchasing used shipping containers. The primary negative of a used shipping container is that it has more wear and tear than a new container. Wear & Tear The main concern with a used container is that buyers aren’t getting a unit in its prime condition. While a used container probably won’t last as long as a new one, it can still last many years, and even decades, which serves its intended purpose for most buyers. Plus, our thorough inspection and grading process ensures that the used container you purchase from us is still more than capable of serving your specific storage needs! Conclusion: Now that you understand the pros and cons of buying new and used shipping containers, are you ready to decide? At Container Management, Inc., we have a wide assortment of shipping containers for sale in over 32 depot sites across the country. Contact us to get your container today!
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