How to Choose an Overhead Crane for Steel Plant Maintenance

Introduction: Start With the Maintenance Job, Not the Crane Capacity

Choosing an overhead crane for steel plant maintenance starts with the maintenance work itself.

A maintenance crane may be used to remove a motor, lift a gearbox, replace a roll, move a pump, or handle other heavy components during shutdowns and repairs. The load may change from one job to another. The working frequency may also be much lower than that of a production crane.

That is why the question is not simply, “How many tons do I need?”

Before selecting a steel plant maintenance overhead crane, check these points:

• What equipment will the crane maintain?
• What is the heaviest component to be lifted?
• How often will the crane operate?
• What are the temperature, dust, water, and other environmental conditions?
• Does the building already have a crane runway?

These details affect the crane capacity, span, lifting height, duty class, hoist type, electrical protection, and overall crane configuration.

For example, a 20 ton maintenance load does not automatically mean that every 20 ton crane will suit the job. If the crane works over a long span, operates frequently, faces high radiant heat, or needs to lift equipment close to the roof, the basic crane specification may need to change.

A good starting point is:

Maintenance load → working area → lifting height → operating cycle → environment → crane configuration

The correct overhead crane for steel plant maintenance is selected from these operating conditions, not from rated capacity alone.

What Crane Capacity Do I Actually Need?

For a steel plant maintenance overhead crane, start with the heaviest component that the maintenance crane must lift.

Yuantai Crane normally asks for the maximum maintenance load before recommending the crane capacity. This gives the engineering team a clear starting point for selecting the bridge crane, hoist, and lifting accessories.

A maintenance crane may handle a motor during one shutdown and a gearbox, roll assembly, or pump during another. The load can vary a lot.

So, do not choose the crane from the average load.

Start With the Heaviest Maintenance Load

Before requesting a quotation from Yuantai Crane, prepare the load data for the equipment that the crane will handle.

For example, a steel mill may need to remove:

• 12 ton electric motor
• 8 ton gearbox
• 15 ton roll assembly
• 18 ton maintenance component

If the 18 ton component is the heaviest planned load, the crane should be selected around that load. The weight of the lifting beam, slings, shackles, or other lifting devices must also be checked.

This is why Yuantai Crane does not recommend selecting a 20 ton overhead crane for steel mill maintenance simply because most maintenance loads are below 20 tons. The maximum lifted load and the complete lifting arrangement need to be checked first.

Calculate the Required Crane Capacity

For preliminary selection, use this simple calculation:

Required Crane Capacity ≥ Maximum Lifted Load + Lifting Accessories

For example:

• Maximum component: 18 t
• Lifting beam: 0.8 t
• Slings and shackles: 0.2 t
• Total lifted load: approximately 19 t

A 20 ton overhead crane may be suitable as a preliminary capacity selection.

Yuantai Crane would then check the actual lifting plan, load spectrum, duty class, span, lifting height, hoist configuration, and site conditions before finalizing the crane design.

Do not add a large capacity margin without a reason. An oversized crane can increase the bridge weight, wheel loads, runway requirements, and project cost.

The better approach is to define the actual maintenance loads first and then select the rated capacity.

Typical Steel Plant Maintenance Loads

Yuantai Crane's steel plant maintenance crane solutions may be used for components such as:

• Electric motors
• Gearboxes
• Roll assemblies
• Pumps
• Fans
• Bearings
• Couplings
• Hydraulic equipment
• Maintenance tools
• Other steel mill equipment components

The load range depends on the production line.

A rolling mill may require a different crane capacity from an auxiliary workshop. A furnace maintenance area may also have heavier components and higher environmental temperatures.

For this reason, the crane capacity should be selected together with the maintenance area, load dimensions, lifting height, operating frequency, and working environment.

Should I Choose a 20 Ton, 30 Ton, or 50 Ton Crane?

For a preliminary discussion, the maximum maintenance load can be grouped like this:

These values are starting points, not final engineering specifications.

For cranes above 20 tons, Yuantai Crane generally starts the design with a double-girder overhead crane for heavy steel plant maintenance applications. The final configuration depends on span, lifting height, duty class, operating frequency, hook coverage, and hoist type.

For higher-duty applications, an open-winch overhead crane may be considered instead of a standard electric wire rope hoist.

What Information Should I Send to Yuantai Crane?

For a faster and more accurate quotation, provide:

• Maximum load: ___ t
• Average maintenance load: ___ t
• Lifting accessories: ___ t
• Load dimensions: ___ m × ___ m × ___ m
• Center of gravity: available / not available
• Span: ___ m
• Lifting height: ___ m
• Working hours: ___ h/day
• Lifts per hour: ___
• Plant temperature: ___ °C
• Dust, scale, water exposure: yes / no
• Existing runway: yes / no

A plant layout or existing crane drawing is also useful.

Buyer Takeaway

Choose the crane capacity from the heaviest component the crane must lift during its service life, including the applicable lifting accessories.

For a steel plant maintenance overhead crane, Yuantai Crane needs more than the requested tonnage to make a proper recommendation. Maximum load, load dimensions, lifting method, operating cycle, and future maintenance requirements all affect the final crane capacity and configuration.

How Do I Determine the Correct Crane Span and Lifting Height?

For a steel plant maintenance overhead crane, span and lifting height should be based on where the hook needs to work.

The building size gives you a starting point. It does not give you the final crane dimensions.

Yuantai Crane normally checks the plant layout, runway arrangement, equipment position, and required hook coverage before confirming the crane span and lifting height.

How to Determine the Crane Span

The crane span is normally the distance between the runway rails, measured center-to-center.

Before specifying the span, collect these dimensions:

• Building bay width
• Runway rail center-to-center distance
• Column spacing
• Equipment position
• Required hook coverage
• Distance from the hook to walls and equipment
• Existing runway dimensions, if available

For example, a workshop may be 22 m wide, but the required crane span may not be exactly 22 m. Columns, runway beams, wall clearance, and the existing rail arrangement can reduce or change the usable crane span.

For a new crane installation, Yuantai Crane can determine the bridge crane dimensions from the building and runway layout.

For an existing crane runway, provide the rail gauge, runway elevation, rail type, and available drawings. The existing structure should be checked before a new crane is designed for it.

Span Is Not Simply the Building Width

A common mistake is to tell the crane manufacturer:

“The workshop is 20 m wide, so I need a 20 m span crane.”

That may not be correct.

The crane span should match the runway and the area that the crane needs to serve.

For steel plant maintenance, also check:

• Furnace auxiliary equipment
• Rolling mill equipment
• Motors and gearboxes
• Pump stations
• Maintenance platforms
• Equipment positioned close to walls
• Areas where components are removed for repair

The key question is:

Can the crane hook reach every required maintenance position?

Hook Coverage Is More Important Than Span Alone

For maintenance work, hook coverage is often more useful than the span number itself.

A 20 m span crane may cover the building well, but the hook may still fail to reach a gearbox located close to a column or a maintenance position outside the normal hook travel area.

Define the required service area first:

Required Hook Coverage = Maintenance Area That Must Be Served

Yuantai Crane uses this information when checking the bridge length, trolley travel, hook approach, and crane position inside the building.

If possible, send a plant layout showing:

• Equipment to be serviced
• Maintenance positions
• Removal areas
• Spare equipment storage areas
• Columns
• Walls
• Existing crane runway

A simple layout can prevent a lot of back-and-forth during crane design.

How to Determine Lifting Height

The lifting height is the vertical distance the hook needs to travel to perform the required lifting work.

For steel plant maintenance, do not determine lifting height from the building height alone.

Prepare these dimensions:

• Floor-to-runway height
• Equipment height
• Highest maintenance position
• Lowest lifting position
• Required hook height
• Load height
• Required clearance above the load
• Hoist headroom
• Roof clearance

For example, if a motor must be lifted from the floor and moved over nearby equipment, the required hook height depends on the motor height, lifting accessories, surrounding equipment, and the clearance needed during movement.

The question is not simply:

“How high is the building?”

It is:

“How high must the hook go to safely remove, move, and position the maintenance load?”

Check Headroom Before Selecting the Hoist

Headroom can become a problem in an existing steel plant building.

The available space between the runway and roof may be limited. A standard hoist may then reduce the available hook height.

Check:

• Hoist overall height
• Hook approach
• Girder depth
• Runway elevation
• Roof clearance
• Distance between the hook and the top of the load

If the building has limited headroom, Yuantai Crane can evaluate a low-headroom wire rope hoist or another suitable hoisting arrangement.

For heavier steel plant maintenance cranes, the final solution may also involve a different girder and hoist configuration. This is where the lifting height, span, crane capacity, and duty class need to be considered together.

What Information Should I Send Yuantai Crane?

For a quotation, provide as many of these dimensions as possible:

A plant layout or building drawing is very useful. Yuantai Crane can use it to check the crane span, hook coverage, hook approach, lifting height, and headroom before preparing the technical proposal.

Buyer Takeaway

Do not select crane span and lifting height from building dimensions alone. Start with the maintenance area and check where the hook must actually work.

For a steel mill overhead crane, the most useful information is the runway rail spacing, equipment position, required hook coverage, floor-to-runway height, highest lifting position, and available headroom.

Send these dimensions to Yuantai Crane, and the crane configuration can be developed around the actual maintenance work rather than an estimated building size.

 What Crane Duty Class Is Right for Steel Plant Maintenance?

Crane duty class depends on how the crane will work, not just how many tons it can lift.

A 20 ton overhead crane used for five lifts a day has a very different operating cycle from a 20 ton crane making 100 lifts a day. The same rated capacity can require a different crane design.

For steel plant maintenance, Yuantai Crane needs the operating data before confirming the duty class.

Why Crane Capacity Does Not Determine Duty Class

A common mistake is to select the duty class from crane capacity alone.

For example:

• 20 ton crane + 5 lifts/day
• 20 ton crane + 30 lifts/day
• 20 ton crane + 100 lifts/day

All three cranes have a 20 ton rated capacity. Their working cycles are very different.

The crane that operates frequently and carries heavy loads needs different mechanical and electrical components from a crane used only for occasional maintenance.

This affects the design of:

• Hoisting mechanism
• Hoist motor
• Brake
• Drum and wire rope
• Gearbox
• Trolley travel mechanism
• Bridge travel mechanism
• Electrical control system
• Structural components

So, 20 ton does not automatically mean A5, A6, or another specific duty class.

What Operating Data Should You Provide?

When requesting a steel plant maintenance overhead crane quotation, provide the following information:

The figures above are examples only. Your actual operating conditions should be used for crane selection.

For a maintenance crane, also describe what happens during a typical maintenance cycle:

1. Pick up the component.
2. Lift it to the required height.
3. Travel with the load.
4. Position the component.
5. Return the hook.
6. Repeat when required.

The more frequent and demanding the cycle, the more important the duty classification becomes.

Load Spectrum Matters

Load spectrum describes how often the crane operates at different load levels during its service life.

For example, a maintenance crane may normally lift:

• 5–10 t loads during routine maintenance
• 10–15 t loads during equipment replacement
• 20 t loads during major shutdown maintenance

This is different from a crane that frequently operates close to its full rated capacity.

Yuantai Crane uses the actual load spectrum together with the operating cycle to evaluate the crane duty requirements.

Do not use a simple rule such as:

“20 ton = A5.”

That shortcut can lead to an unsuitable crane specification.

A crane used only occasionally may not need the same duty level as a production crane operating continuously. On the other hand, a maintenance crane working intensively during frequent shutdowns may need a higher-duty configuration.

ISO and FEM Crane Classification

Crane manufacturers commonly use ISO and FEM classifications to describe crane duty and mechanism service conditions.

The classification considers factors such as:

• Operating frequency
• Number of working cycles
• Load spectrum
• Average load
• Maximum load
• Hoisting and travel movements
• Expected working life

The exact classification should be selected according to the applicable design standard and the actual operating conditions.

For a steel plant maintenance overhead crane, the duty class can affect the selection of the hoist, motors, brakes, gearboxes, electrical equipment, and structural design.

Yuantai Crane can determine the suitable ISO/FEM duty level after reviewing the customer's operating data.

What Happens If the Duty Class Is Too Low?

An underspecified crane may operate outside its intended service conditions.

Possible problems include:

• Faster wear of brakes and gears
• Higher motor heating
• More frequent maintenance
• Reduced component service life
• Increased downtime
• Higher risk of unplanned repairs

The opposite approach—simply choosing the highest duty class—can also increase the crane cost and component size without providing useful value.

The target is the duty class that matches the actual maintenance work.

Example: 20 Ton Steel Plant Maintenance Crane

Consider a preliminary project:

• Crane capacity: 20 t
• Working hours: 8 h/day
• Lifts: 10 lifts/hour
• Average load: 10 t
• Maximum load: 20 t
• Maximum-load lifting: Occasional
• Application: Steel mill equipment maintenance

This information gives Yuantai Crane a much better basis for duty-class selection than “20 ton maintenance crane” alone.

The engineering team would then review the lifting cycle, annual operating hours, load spectrum, span, lifting height, and environmental conditions before confirming the final crane specification.

Buyer Takeaway

Crane capacity tells you how much the crane can lift. Duty class tells you how often and how hard it is expected to work.

When requesting a steel plant maintenance overhead crane, provide the working hours, lifts per hour, average load, maximum load, maximum-load frequency, lifting distance, travel distance, and expected service life.

Yuantai Crane can then evaluate the actual load spectrum and operating cycle and recommend a suitable ISO/FEM duty class, instead of assigning a duty class from crane tonnage alone.

How Should the Crane Be Designed for Heat, Dust, Water, and Other Harsh Conditions?

Steel plants can expose overhead cranes to conditions that are much more severe than those in a normal fabrication or warehouse workshop.

Heat, steel scale, metal dust, oil mist, cooling water, descaling water, and condensation can all affect crane components.

The right approach is not to simply specify a “high-temperature crane.” The crane manufacturer needs to know where the crane operates and what conditions it will actually face.

Temperature: Ambient Temperature vs. Radiant Heat

Temperature is one of the first environmental conditions to check.

But two different temperature conditions need to be separated:

• Ambient temperature: the temperature of the air around the crane.
• Radiant heat: heat transferred from furnaces, molten steel, hot billets, slabs, or other hot equipment.

These conditions can be very different.

For example, the workshop air may be within a normal operating range while a crane working above a hot production line is exposed to strong radiant heat.

When requesting a quotation, provide:

This information is more useful than simply telling the manufacturer that “the workshop is hot.”

Depending on the actual conditions, the crane design may include:

• Heat-resistant electrical components
• Thermal protection
• Heat-resistant cables
• Protected motors
• Special lubrication
• Heat shields
• Additional protection for electrical equipment
• Improved cooling arrangements where required

The exact solution should be based on the measured or expected site conditions.

Do not specify a high-temperature crane only by workshop temperature. Tell the crane manufacturer the ambient temperature, radiant heat exposure, distance from the heat source, and whether the crane operates directly over hot equipment.

Dust, Scale and Oil

Steel plants can also expose cranes to large amounts of dust and contamination.

Typical sources include:

• Steel dust
• Metal particles
• Scale
• Process dust
• Oil mist
• Grease and other contaminants

These materials can enter motors, brakes, electrical enclosures, cable systems, and moving components.

The crane design should therefore consider:

• Motor protection
• Electrical enclosure protection
• Cable protection
• Brake protection
• Component sealing
• Suitable lubrication
• Maintenance access

For example, if a crane operates near a rolling mill, the environment may contain both metal scale and oil. A crane installed near a furnace may face heat and dust at the same time.

The design should address the combined environment, rather than selecting protection for only one condition.

For Yuantai Crane, this environmental information is part of the crane specification. It helps determine the appropriate motor, electrical equipment, enclosure protection, cable arrangement, sealing, and maintenance provisions.

Water and Moisture

Water is another common issue in steel plants.

The crane may be exposed to:

• Cooling water
• Descaling water
• Water spray
• Steam
• Condensation
• High humidity
• Outdoor or semi-outdoor conditions

Water exposure is especially important for electrical equipment.

Depending on the installation environment, the crane may require suitable:

• IP protection
• Corrosion protection
• Electrical enclosure design
• Motor protection
• Cable protection
• Sealing of electrical connections

The manufacturer should know whether the crane is installed inside a dry maintenance bay, near a water-cooled process line, or in a semi-outdoor area.

Tell the Crane Manufacturer the Actual Site Conditions

For a steel plant maintenance crane, avoid using a general description such as:

“High temperature and dusty environment.”

Provide measurable information where possible.

A useful RFQ environmental data sheet can include:

These are example values only. The final crane specification must use the actual project conditions.

Environmental Conditions Affect More Than the Electrical System

Harsh conditions do not only affect motors and electrical cabinets.

They can also influence:

• Wire rope and sheaves
• Brakes
• Gearboxes
• Bearings
• Lubricants
• Cable festoon systems
• Limit switches
• Control panels
• Pendant controls
• Radio remote controls
• Maintenance intervals

For example, heat may affect lubricant selection and motor operating conditions. Dust may increase contamination and wear. Water may create electrical and corrosion problems.

That is why environmental conditions should be considered together with capacity, duty class, span, lifting height, and operating cycle.

Buyer Takeaway

For a steel plant maintenance overhead crane, do not simply specify “high-temperature” or “heavy-duty”.

Give the manufacturer the actual site conditions:

Ambient temperature + radiant heat + distance from heat source + dust/scale + oil + water + indoor/outdoor conditions.

Yuantai Crane can then evaluate the required protection for the hoist, motors, electrical system, cables, brakes, lubrication, and other crane components.

The better the environmental data, the more accurately the crane can be designed for the steel plant maintenance application.

When Should I Choose a Double-Girder Crane or an Open-Winch Hoist?

For steel plant maintenance, crane configuration should match the load, span, lifting height, duty class, and working environment.

A single-girder crane with a wire rope hoist can be suitable for many maintenance jobs. But when the crane handles heavier loads, works over a long span, operates frequently, or requires a higher-duty lifting mechanism, a double-girder overhead crane with an open-winch hoist is often the better starting point.

The choice should be made from the complete operating condition, not capacity alone.

Wire Rope Hoist vs. Open-Winch Hoist

Both configurations use wire rope for lifting, but their construction and typical applications are different.

This is a general comparison. Actual selection depends on the project.

A wire rope hoist is often a practical choice when the crane has moderate operating frequency and the maintenance loads do not require a large open-winch mechanism.

An open-winch hoist becomes more attractive when the crane has higher duty requirements, higher lifting height, heavier loads, frequent operation, or demanding steel plant service conditions.

For heavy maintenance cranes, the open-winch arrangement also provides easier access to major lifting components such as the motor, gearbox, brake, drum, and related mechanisms.

When Is a Double-Girder Crane Preferred?

A double-girder overhead crane should be considered when the application places higher demands on the crane structure or lifting mechanism.

The main factors are:

• Crane capacity
• Span
• Lifting height
• Duty class
• Operating frequency
• Hook coverage
• Available headroom
• Steel plant environment
• Expected service life

For example, a 20 ton crane with a short span and occasional maintenance work may have very different requirements from a 20 ton crane with a long span, high lifting height, and frequent heavy lifting.

The crane configuration should be selected after reviewing these conditions together.

Why Double Girder for Heavy Steel Plant Maintenance?

A double-girder overhead crane provides a more robust crane arrangement for heavy-duty applications.

It can provide advantages when the project requires:

• Higher lifting capacities
• Longer spans
• Higher lifting heights
• Higher duty classes
• Frequent lifting cycles
• Better hook coverage
• More demanding load positioning
• More space for heavy-duty hoisting equipment

For steel plant maintenance, the crane may need to remove large motors, gearboxes, rolls, pumps, hydraulic equipment, or other heavy assemblies during planned shutdowns.

In these cases, crane stability, lifting mechanism capacity, headroom, and serviceability become important parts of the selection.

What About 20 Ton and Above?

For 20 ton and above steel plant maintenance applications, a double-girder overhead crane is generally the preferred starting configuration, especially when the crane involves:

• High duty
• Long span
• High lifting height
• Frequent heavy lifting
• Large load dimensions
• Demanding hook coverage
• Harsh operating conditions

This does not mean every 20 ton crane must use a double-girder design.

A project with occasional maintenance lifting, a relatively short span, moderate lifting height, and lower operating frequency may have a different economical solution.

The final configuration should be confirmed from the complete technical data.

When Is an Open-Winch Hoist Worth Considering?

An open-winch hoist is usually worth considering when the maintenance crane has a demanding working cycle or when the lifting mechanism itself needs a higher-duty industrial configuration.

Typical conditions include:

Frequent lifting

The crane operates regularly rather than only during occasional shutdown maintenance.

High lifting height

The hook must travel a long vertical distance and the hoisting mechanism has a demanding service requirement.

Heavy loads

The crane frequently handles large components close to its rated capacity.

High duty class

The crane has a higher number of working cycles and a higher load spectrum.

Long-term steel plant service

The crane is expected to remain in service for many years under demanding operating conditions.

In these cases, Yuantai Crane may evaluate a double-girder crane with an open-winch trolley instead of a standard wire rope hoist arrangement.

Do Not Select the Hoist Separately From the Crane

One common procurement mistake is to decide the hoist first and the crane structure later.

For steel plant maintenance, these items should be evaluated together:

Capacity → span → lifting height → duty class → load spectrum → environment → hoist type → crane configuration

For example, increasing lifting capacity may affect the trolley, girder, wheels, runway loads, motor power, brakes, and electrical system.

Increasing span may affect girder design and wheel loads.

Increasing duty class may require different motors, brakes, gearboxes, and other mechanisms.

The crane should therefore be designed as one complete lifting system.

Example: Selecting a 20 Ton Steel Plant Maintenance Crane

Consider a preliminary project:

• Capacity: 20 ton
• Span: 22 m
• Lifting height: 12 m
• Working time: 8 h/day
• Lifts: 10–20 cycles/hour
• Average load: 40–60% of rated capacity
• Maximum load: 20 ton
• Maximum-load lifting: Occasional
• Environment: Steel plant maintenance area
• Operation: Regular maintenance and shutdown work

This application should not be specified simply as:

“20 ton overhead crane.”

The engineering review should determine the duty class, girder configuration, hoist type, motor arrangement, brake system, electrical protection, and other components.

For this type of heavy steel plant maintenance application, a double-girder overhead crane is a reasonable starting configuration. If the operating cycle and duty requirements are high, an open-winch hoist may also be preferred.

The final selection depends on the actual load spectrum and site conditions.

Buyer Takeaway

The choice between a wire rope hoist and an open-winch hoist depends on how the crane will work.

A standard wire rope hoist can be suitable for moderate maintenance duty.

A double-girder crane with an open-winch hoist becomes more suitable as capacity, span, lifting height, duty class, operating frequency, and environmental demands increase.

For a steel plant maintenance crane of 20 ton and above, start by evaluating a double-girder configuration. Then confirm whether a standard wire rope hoist or open-winch hoist is appropriate based on the actual operating cycle.

When requesting a quotation from Yuantai Crane, provide:

• Maximum load
• Average load
• Span
• Lifting height
• Working hours/day
• Lifts/hour
• Maximum-load frequency
• Required hook coverage
• Steel plant environmental conditions
• Existing runway information

This gives the manufacturer enough information to recommend the crane configuration instead of selecting a hoist from tonnage alone.

Technical Data You Should Prepare Before Requesting a Crane Quote

A crane manufacturer cannot accurately select a steel plant maintenance overhead crane from capacity alone.

Before requesting a quotation, prepare the basic operating, building, and environmental data below.

The more complete the RFQ information is, the less back-and-forth is needed during technical clarification.

Steel Plant Maintenance Crane RFQ Checklist

Which Data Is Most Important?

If you cannot provide every parameter at the RFQ stage, start with these:

1. Maximum lifted load
2. Average lifted load
3. Crane span
4. Lifting height
5. Working hours per day
6. Lifts per hour
7. Maximum-load frequency
8. Ambient temperature
9. Radiant heat exposure
10. Dust, scale, oil, and water exposure
11. Existing or new runway
12. Plant layout

These parameters give the crane manufacturer a basic picture of the application.

What Drawings Should You Send?

A plant layout is particularly useful for a steel plant maintenance crane.

Where possible, mark:

• Crane runway
• Runway rail centerline
• Building columns
• Equipment to be maintained
• Equipment removal points
• Maintenance platforms
• Equipment storage areas
• Furnace or other heat sources
• Areas exposed to water
• Required hook coverage
• Roof and structural clearance
• Existing crane positions

If an existing runway will be reused, also provide the available runway information and structural drawings.

This allows the manufacturer to check whether the proposed crane can cover the required maintenance area and whether the existing structure is suitable for the new crane.

A Simple Example RFQ

For example, a buyer may send the following preliminary information:

This is already much more useful than an RFQ that only says:

“Please quote a 20 ton overhead crane for steel plant maintenance.”

The manufacturer can use the information to evaluate the crane capacity, duty class, girder arrangement, hoist type, environmental protection, and runway requirements.

Send the Data in One RFQ Package

For a faster technical quotation, prepare these three groups of information:

1. Crane data
Capacity, span, lifting height, duty class, control, power supply, quantity.

2. Operating data
Working hours, lifts per hour, average load, maximum load, load frequency, lifting distance, crane travel distance.

3. Site data
Temperature, radiant heat, dust, scale, oil, water, building dimensions, existing runway, and plant layout.

With these details, Yuantai Crane can move from a basic price inquiry to a more accurate preliminary crane specification.

Buyer takeaway: The best RFQ is not the one with the most technical terms. It is the one that clearly describes what the crane must lift, where it must work, how often it will work, and what environment it will face.

Preliminary Example: 20 Ton Overhead Crane for Steel Plant Maintenance

The following example shows how the previous selection criteria can be applied to a typical steel plant maintenance project.

The purpose is not to define a final crane specification. It shows how a crane manufacturer can make a preliminary selection from the available project data.

Project Conditions

Based on these conditions, the initial crane selection would be:

20 ton double-girder overhead crane

This is a reasonable starting configuration for a heavy steel plant maintenance application. The final design still requires technical review.

Why Start With a Double-Girder Crane?

The 20 ton capacity is only one part of the selection.

The project also has:

• 20 m span
• 10 m lifting height
• Frequent maintenance lifting
• Heat and dust exposure
• Regular handling of heavy maintenance loads

These conditions make a double-girder configuration worth evaluating from the beginning.

The final decision should consider the actual load spectrum, operating cycle, hook coverage, headroom, and runway structure.

Duty Class: Review the Operating Cycle

“Frequent maintenance lifting” is not enough to assign a final duty class.

The manufacturer should confirm:

• Working hours per day
• Working days per year
• Lifts per hour
• Average lifted load
• Maximum lifted load
• Frequency of maximum-load lifts
• Average lifting distance
• Average crane travel distance
• Expected service life

For example, if the crane normally handles 8–12 ton components but occasionally lifts the full 20 ton load, its load spectrum is different from a crane that regularly operates close to 20 ton.

Therefore, the ISO/FEM duty class should be confirmed after reviewing the operating cycle.

Hoist: Wire Rope Hoist or Open-Winch?

Both options may be considered at the preliminary stage.

A standard wire rope hoist may be suitable if the operating duty is moderate and the lifting cycle does not place unusually high demands on the hoisting mechanism.

An open-winch hoist may be preferred if the crane requires:

• Higher duty
• Frequent lifting
• High lifting height
• Heavy and repeated loads
• Long-term demanding steel plant service

For this reason, the RFQ should provide enough operating data before the final hoist type is selected.

Environment: Heat and Dust Protection

The description “dust and heat” needs further clarification.

The manufacturer should confirm:

• Maximum ambient temperature
• Normal ambient temperature
• Radiant heat exposure
• Distance from furnace or hot equipment
• Whether the crane operates directly above hot equipment
• Steel dust and scale levels
• Oil mist
• Water exposure

The crane can then be designed with the appropriate protection for motors, electrical equipment, cables, brakes, lubrication, and other components.

A “high-temperature crane” should not be specified simply because the workshop is hot.

Span: Verify Runway and Hook Coverage

The preliminary span is 20 m.

Before finalizing the crane, check:

• Runway rail center-to-center distance
• Building column locations
• Runway beam arrangement
• Wall and equipment clearances
• Required hook coverage
• Maintenance positions
• Existing runway dimensions

A 20 m building width does not automatically mean a 20 m crane span.

The actual span should be based on the runway and the area that the hook must serve.

Lifting Height: Check Headroom and Hook Approach

The preliminary lifting height is 10 m.

The manufacturer should also check:

• Floor-to-runway height
• Roof clearance
• Girder depth
• Hoist headroom
• Highest maintenance position
• Required hook height
• Load dimensions
• Hook approach

The important question is not simply:

“Is the building 12 m high?”

It is:

“Can the crane hook safely reach the position where the 20 ton component must be removed, moved, and installed?”

Structure: Check the Existing Runway and Wheel Loads

If the plant already has a crane runway, it should not be assumed that the existing structure can automatically support the new 20 ton crane.

The engineering review should check:

• Runway beam capacity
• Rail type and size
• Rail gauge
• Column arrangement
• Maximum wheel loads
• Existing crane dead weight
• Dynamic loads
• Building structural capacity
• Available runway elevation

If the runway is new, the crane manufacturer can provide the relevant wheel loads and other crane loads for structural design.

Preliminary Selection Summary

Important Note

This is a preliminary selection, not a final crane specification.

The final 20 ton steel plant maintenance crane should be designed after reviewing:

• Plant layout
• Maximum and average loads
• Load spectrum
• Operating cycle
• Duty class
• Span and hook coverage
• Lifting height and headroom
• Temperature and radiant heat
• Dust, scale, oil, and water exposure
• Existing or new runway structure
• Crane wheel loads
• Applicable design and safety requirements

This approach gives the buyer a more reliable starting point for technical discussions and quotation comparison.

For Yuantai Crane, the most useful RFQ is not simply “20 ton overhead crane.” The manufacturer needs to understand what the crane will lift, where it will operate, how frequently it will work, and what conditions it will face.

Conclusion: Choose the Crane From the Maintenance Data

The right steel plant maintenance crane starts with the actual maintenance data—not a standard crane model.

Maximum Load → Span & Hook Coverage → Lifting Height → Duty Class → Environment → Hoist & Girder Configuration → Runway & Safety

Confirm the heaviest load first. Then check where the hook must work, how high it must lift, how often the crane will operate, and what conditions it will face. These factors determine the crane capacity, duty class, hoist type, girder configuration, and runway requirements.

If you are planning an overhead crane for steel plant maintenance, provide the maximum load, span, lifting height, operating cycle, temperature, and plant environment. Yuantai Crane can use these parameters to develop a suitable crane configuration and technical proposal.

Article by Bella ，who has been in the hoist and crane field since 2016. Bella provides overhead crane & gantry crane consultation services for clients who need a customized overhead travelling crane solution.Contact her to get free consultation.