Are you looking to add an overhead crane to your facility? Have you heard phrases like “modular crane,” “engineered crane,” or “process crane” thrown around and wonder what type of bridge crane might be best for your business?
The main difference between a modular crane system and a process crane is the amount of engineering required to design and build the bridge crane system. Special consideration has to be given to:
In this article, we’ll compare modular cranes and engineered / process cranes and provide you with a comprehensive breakdown of:
A modular crane is a popular type of pre-engineered system that includes all of the components for a bridge crane—excluding the bridge girder(s) and the paint system. These types of crane systems aren’t necessarily designed for a specific process but are designed to be general purpose material movers. They typically run at fairly low speeds and are used infrequently.
Because of this, a modular crane system is mostly going to play in the lower capacities of 10 tons and under and fall within more standard span and runway ranges.
Typically, the crane’s electrification, controls, hoist, motors, and drives are all standard off-the-shelf parts. These components have been selected for use within pre-specified ranges for capacity, span, and usage. All of these components are compatible with each other and are designed to be “plug and play” with the included electrical panels.
The cranes themselves can be top running or under running. The bridge girders can be configured in a single girder or double girder design and are fabricated to order based on the desired span and capacity of the system.
When it comes to duty cycle, modular cranes mostly fall somewhere in the CMAA Class A, Class B, or Class C ratings—however, some modular crane systems could be classified as Class D.
However, make sure you carefully understand the ratings and specifications of a modular system that has been rated as Class D. Some of the individual components may be using European FEM standards that fall just short of the CMAA and HMI Class D specifications when it comes to motor starts/stops and bearing life recommendations.
Modular cranes aren’t driven by a specific lifting application and are most commonly used in general industry, light manufacturing or fabrication, and maintenance or machine shops.
There are a couple of different factors that an overhead crane manufacturer will consider when recommending a modular crane system:
A modular crane system is a great fit when a manufacturer receives a customer request like, “I know I need a 5-ton crane to move some loads through my building. I want it motorized in all three directions. It doesn’t need to be fast, and it won’t be high usage. Oh by the way, I want it cheap and I need it quick!”
Most commonly, a modular crane system is going to be comprised of standardized off-the-shelf components including the hoist, end truck wheel bases, drives, and festooning. Everything in the system is packaged with components that have been pre-engineered to work together—all the way down to the connection points and individual bolts.This may sound like you’re just assembling an erector set, but you still need a professional crane manufacturer to fabricate and install your overhead crane system, so that everything is square and within precision tolerances. Otherwise, you’ll get a crane system with all kinds of problems—including alignment issues and premature wear to brakes, wheels, and end trucks.Modular cranes typically don’t come with the bells and whistles of an engineered crane system, but that’s not to say that certain components can’t be upgraded or specialized based on special requirements or application.
There is a middle ground between a modular crane system and a fully engineered process crane. Modular “Plus” types of cranes include mostly off-the-shelf components, but may also have some additional options or upgrades requested by the end-user (or recommended by the manufacturer) in order to:
Some of the common components that can be upgraded include:
Let’s be clear, a modular bridge crane system can be an excellent investment and the most economical solution for many business owners. If the proposed solution fits the bill for your usage, budget, and delivery requirements, then it’s going to be a good crane for you.
Best practices for keeping your crane up and running and getting a good return on your investment, include:
When designing an overhead crane, you’ll also want to give special consideration to any future usage requirements. If you think that your production may expand down the road (which may result in higher capacity lifts or an increase in the number of lifts per day) then you may want to spec out the crane and components so it can accommodate future growth.
If you over-specify a crane, it will result in a higher initial cost for the crane and runway system, but will have less maintenance and down time in the long run. If your crane is being over-used, or was under specified to begin with, your total cost of crane ownership can exceed the initial investment just through maintenance, service, and repair.
Since the crane does use off-the-shelf components, there is an inherent life expectancy for the included parts. Some components can have fairly long lead times to source replacement parts and the cost of replacement or repair can add up over time. The cost to replace a motor down the road may not be worth it when compared to the cost of replacing with a brand new crane system.
Always approach the process of purchasing an overhead crane, by considering the total cost of ownership. Consider what your costs will be 3-5 years down the road, 10 years down the road, etc.
Engineered process cranes are designed and built to meet the specific requirements of a production process. When it comes down to it, process is everything for an engineered overhead crane system. These types of overhead cranes are designed to withstand the rigors and repetition of performing a critical lifting action over and over again.
The benefits of a process crane are that they designed to provide the end user with:
In most cases, these cranes are classified as CMAA Class D, Class E, or Class F cranes. When designing these cranes, careful consideration has to be given to total hours of operation, the types of loads being lifted, and the number of lifts or movements being performed each shift.
These engineered crane systems are typically higher capacity, higher duty cycle, perform a critical task, and move at faster speeds and with more precision, than traditional modular crane systems.
Engineered crane systems are also capable of providing operators and production teams with modern features and functionality, including:
There are certain applications that will always require the use of a high-performance, heavy-duty, and highly-engineered overhead crane. The following applications will require the use of an engineered crane:
Understand that there are different levels to an engineered crane system and the focus of the design is based on a specific process or lifting application. One engineered crane system used in a high-output manufacturing facility won’t have the same specs or components as a similar capacity crane used in a steel mill or a paper mill.These types of cranes exist because there’s a high level of engineering that’s required and an “out of the box” solution won’t work for a variety of different reasons:
Engineered crane systems are often viewed as a critical piece to the production process. For this reason, when a company decides to invest in an engineered crane system, the process is much different than when compared to buying a modular crane kit.
The consultation process typically involves multiple stakeholders, and often the buyer is much more educated about what they need. The customer often has done some pre-engineering on their end and may have an actual project specification they want manufacturers to use for quoting purposes.
On an engineered crane system, there is careful consideration given to each individual component of the crane. In this case, the system moves away from “plug and play” connections and into more specialized and robust components that are designed to stand up to the rigors of the lift. In most instances, the components get hardwired into the electrical panels.
Engineered process cranes, include more “bells and whistles,” that provide the end-user with the following advantages:
Engineered crane systems can also include some of these more specialized features:
Another benefit of more specialized components is that they’re designed to allow for easier inspection, adjustment, repair, and maintenance.
Highly-specialized components need highly-skilled maintenance personnel or an experienced and qualified crane and hoist service provider. Whoever is performing inspections and maintenance on a process crane has to have a solid understanding of electrical and mechanical components to be able to troubleshoot issues, perform inspections, and make adjustments or repairs in a timely fashion—prolonging downtime can be costly to the bottom line and affect other production processes down the supply chain.
Because the crane can be so critical to the production process, any type of unexpected downtime can have devastating impacts on the bottom line the longer the crane is out of service—especially for those who utilize a just-in-time (JIT) production strategy.
Để tóm tắt
When designing an overhead crane system that’s right for your business, always be honest and upfront with the manufacturers during the consultation. In order to properly specify the right crane system, they need to have a total understanding of any of the following considerations:
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