Choosing an industrial hoist involves more than identifying the heaviest load you need to lift.
Two hoists may have the same stated lifting capacity but be designed for very different working conditions. How often the hoist operates, how far it lifts, the loads it typically handles and the demands placed on it throughout the working day can all influence the correct specification.
Understanding both hoist capacity and duty cycle can help ensure that the equipment is suitable for the way it will actually be used.
What is hoist capacity?
Hoist capacity is the maximum load that the hoist is designed to lift safely within its specified operating conditions.
For example, if the heaviest component handled within a manufacturing process weighs 2,000 kg, the hoist must be appropriately rated for that lifting requirement.
However, maximum load should not be considered in isolation.
A hoist that occasionally lifts a heavy component may have very different operational demands from one performing hundreds of repetitive lifts throughout a production shift.
This is where duty cycle becomes important.
What does hoist duty cycle mean?
Hoist duty cycle broadly describes how intensively a hoist is expected to operate.
The classification of a hoist can take into account factors including:
- How many hours the hoist operates
- The number of lifting cycles or starts
- The average load being lifted
- How regularly the maximum load is handled
- The distance travelled during each lift
- Lifting and lowering speeds
The greater the frequency and intensity of operation, the more demanding the duty requirement becomes.
This means a hoist used occasionally in a maintenance workshop may require a different specification from a hoist operating continuously within a busy production environment, even if both lift similar maximum weights.
Step 1: Establish the maximum load
The starting point when calculating hoist capacity is identifying the maximum load the equipment will be required to lift.
Consider the complete lifted load rather than the product or component alone.
Depending on the application, this may include lifting attachments, beams, grabs, magnets or other below-the-hook equipment.
It is also worth considering whether production requirements could change in future. Installing equipment that is only suitable for today’s maximum load may restrict future flexibility.
The aim is not simply to select the highest capacity available, but to specify equipment appropriately for the application.
Lifting Systems supplies a wide range of chain and wire rope hoists for industrial lifting applications.
Step 2: Understand your typical load
Maximum capacity tells only part of the story.
You should also consider the loads the hoist will handle during normal operation.
Ask:
- Is the hoist usually lifting close to its maximum capacity?
- Are most loads considerably lighter?
- Is maximum capacity only required occasionally?
- Does the weight vary considerably between lifts?
A hoist that frequently handles loads close to its rated capacity is subjected to a different load profile from equipment that usually lifts lighter loads.
Understanding the typical load spectrum helps determine the appropriate duty classification.
Step 3: Calculate how frequently the hoist will operate
Next, consider how often lifting takes place.
This could include:
- Lifts per hour
- Operating hours per shift
- Number of shifts per day
- Days of operation per week
- Frequency of starts and stops
A hoist performing ten lifts during a maintenance task has a very different operating requirement from one supporting repetitive production throughout an eight-hour shift.
This is one of the reasons specifying equipment purely according to lifting capacity can lead to an under-specified hoist.
Step 4: Consider the height of lift
The distance travelled by the hook also contributes to the overall operating demand.
A short workstation lift of one or two metres places different demands on the equipment from an application involving repeated lifts across a much greater vertical distance.
When assessing the application, establish:
- Lowest hook position
- Highest required hook position
- Typical lifting distance
- Maximum lifting distance
The required height of lift will also influence the physical configuration and type of hoist selected.
Step 5: Consider lifting speed
Lifting speed can affect both production efficiency and hoist selection.
Some applications require relatively fast movement to maintain production throughput, while others prioritise slow, controlled positioning.
The appropriate speed will depend on the load, process and working environment.
Where precise load positioning is required, multiple-speed or variable-speed hoisting may also be appropriate.
Step 6: Assess the working environment
The operating environment should always form part of the hoist specification.
Consider factors such as:
- Indoor or outdoor use
- Dust or contamination
- Moisture
- Temperature
- Corrosive environments
- High production temperatures
- Restricted headroom
- Unusual operating conditions
Environmental conditions can influence electrical protection, components, controls and the overall equipment specification.
Why does the correct duty cycle matter?
A hoist that is technically capable of lifting the required weight can still be unsuitable if it is not designed for the frequency or intensity of use.
Operating equipment beyond its intended duty can contribute to:
- Accelerated component wear
- Increased maintenance requirements
- Overheating
- More frequent breakdowns
- Reduced equipment life
- Unplanned production downtime
Correct specification therefore supports both equipment reliability and long-term operating performance.
Capacity and duty cycle should be considered together
Imagine two facilities that both need to lift a maximum load of 2 tonnes.
Facility A uses its hoist several times each week for maintenance activities.
Facility B uses its hoist throughout two production shifts, repeatedly handling loads between 1 and 2 tonnes.
Although the maximum load is the same, the correct hoist specification may be very different.
This is why understanding the application is just as important as knowing the maximum weight.
If you are also deciding between different hoist types, our guide to wire rope hoists vs chain hoists explains some of the key differences.
Do you need to calculate the duty classification yourself?
Not necessarily.
Hoist duty classification can involve detailed calculations based on equipment standards, manufacturer specifications and the operating profile.
For most businesses, the important first step is gathering accurate information about the application:
- Maximum load
- Typical load
- Frequency of use
- Lifts per hour
- Working hours
- Height of lift
- Required speed
- Operating environment
An experienced lifting equipment supplier can then use this information to help specify the appropriate hoist.
Choosing the right industrial hoist
At Lifting Systems, we supply chain and wire rope hoists for a wide range of industrial applications, from lighter workstation lifting through to heavier manufacturing and production environments.
Our team can assess your load, lifting frequency, working environment and wider crane system before recommending suitable equipment.
If you are planning a new hoist installation or reviewing an existing lifting system, contact Lifting Systems to discuss your requirements.
Hoist Capacity and Duty Cycle FAQs
How do I calculate the correct hoist capacity?
Start by identifying the heaviest total load that will be lifted, including any below-the-hook lifting equipment. Capacity should then be considered alongside operating frequency, lifting height, working environment and duty requirements.
What is a hoist duty cycle?
Hoist duty cycle describes how intensively a hoist operates. Factors can include operating time, number of lifts or starts, average load, maximum load frequency and lifting distance.
Can two hoists with the same capacity have different duty ratings?
Yes. Two hoists may both be capable of lifting the same maximum weight while being designed for very different operating frequencies and working conditions.
What happens if a hoist is under-specified?
Using a hoist more frequently or intensively than its design allows can accelerate wear, increase maintenance requirements and reduce equipment life.
What information is needed to specify an industrial hoist?
Useful information includes maximum and typical load, frequency of lifting, number of operating hours, height of lift, required lifting speed, available headroom and working environment.
