Joe Otten, Learning and Development
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Overhead cranes, or bridge cranes, serve a wide variety of industries and they are generally designed in four primary configurations. Determining the best set-up for your operations depends on your required capacity, duty class and lifting height, and on whether you’re installing the crane in a new or existing building.
As you go about determining the types of overhead cranes required for your needs and facility, here’s what you should keep in mind.
The two primary configuration options for overhead cranes are top running and under running (also called underhung). On a top-running crane, the end truck rides on top of the runway beam. On an under-running crane, the end truck rides on the lower flange of the runway beam. Each has their advantages.
An underhung crane typically allows much better end approach for the hoist. That is, it allows the hoist to get closer to the end truck or end of the runway than is possible with a top running crane. Underhung cranes tend to be more cost effective than top running cranes. Also, if your operation calls for you to be able to transfer hoists along bridges to interconnected monorails, you need to have an underhung style of overhead crane.
A top-running crane has the advantage of generally being able to lift heavier loads than underhung cranes. Additionally, a top-running crane offers greater headroom than an under-running crane.
The other two configuration options for cranes are single girder or double girder, both of which can be used with either top or under-running overhead cranes.
As you might expect, double-girder cranes support higher capacities, but are more expensive. Additionally, double-girder designs typically allow greater hook height than single-girder designs, as the hoist can be mounted on top of the bridge rather than underneath.
Single-girder cranes, meanwhile, cost less but generally have lower capacities than double-girder cranes. On single-girder cranes, the hoist always rides the bottom of the crane girder in both top-running and underhung configurations. This creates a bigger operating envelope for the hoist and is a solution for applications where headroom is not a limitation.
Another major consideration for determining the most appropriate types of overhead cranes for your operations is whether you’re equipping a new or existing building. With an existing building you’ll have to work with the available clearances and choose the configuration accordingly. With a new building you have greater flexibility, so long as you involve a crane provider early in the planning process. A crane provider can help you save on building costs by designing a crane that provides the coverage you need, while making the building no higher than necessary to accommodate the crane.
Selecting the right marine crane is a crucial decision for any vessel or offshore platform. The crane you choose will directly impact the safety, efficiency, and success of your operations, whether you are transporting cargo, conducting offshore research, or involved in construction.
With various options available, understanding what type of crane best suits your needs is essential. This marine crane selection guide will walk you through the factors to consider when choosing the right marine crane for your project.
Let’s examine the key factors to consider when choosing a marine crane:
The first and most important consideration is the type of operation you’ll be conducting. Different operations require different crane capabilities. For example:
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If your vessel primarily transports cargo, you’ll need a crane with a high lifting capacity, durability, and long reach, such as a telescopic or stiff boom crane.
For construction projects, a crane capable of lifting heavy equipment and materials in rough sea conditions is essential. Knuckle boom cranes are often ideal for this type of work due to their flexibility and precise handling.
Oceanographic research vessels and fishing boats need cranes that can deploy and retrieve equipment with precision. Knuckle boom cranes or compact folding cranes are often best suited for these applications.
The lifting capacity of a marine crane is one of the most critical factors. Always ensure the crane you select can handle the maximum load required by your operation. Overloading a crane can lead to equipment failure and accidents. Consider both the maximum weight and the crane’s rated capacity for continuous use.
Depending on your needs, the reach and flexibility of the crane may also be a key factor. For operations that require long reach or access to hard-to-reach areas, a telescopic boom crane may be the best option. Alternatively, if you need precise load handling in tight spaces, a knuckle boom crane is often ideal due to its articulated arm.
The available deck space on your vessel or platform will also influence your choice of crane. Some cranes, like folding boom cranes, are designed to minimize their footprint when not in use, making them perfect for vessels with limited space. Larger vessels, however, may have the capacity for more robust cranes that do not need to fold or retract.
Marine cranes must be built to withstand harsh environmental conditions, including exposure to saltwater, high winds, and corrosive elements. Choose cranes that are made from corrosion-resistant materials and equipped with protective coatings to ensure they last in tough marine environments.
Understanding the types of marine cranes available will help you find the right fit for your operation. Here are the most common types of cranes used in the marine industry:
Sometimes, standard crane models don’t fit the unique demands of a specific operation. In these cases, customized marine cranes can be the solution.
Customization allows you to modify the crane’s capabilities, such as increasing load capacity, adjusting the reach, or designing the crane to handle extreme weather conditions.
Custom cranes can also be designed to fit specific deck layouts and operational needs.
By working with manufacturers like DMW Marine Group, you can create a crane that perfectly suits your vessel’s requirements, ensuring efficiency and safety in your operations.
Choosing the right marine crane requires a deep understanding of your operation’s needs, including lifting capacity, reach, flexibility, and the environment you’ll be working in. The right crane will enhance the safety and efficiency of your operation, while the wrong one could lead to downtime, costly repairs, and even safety risks.
By following this marine crane selection guide, you can make an informed decision that ensures long-term success.
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