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Name: Top Running Double Girder Overhead Crane for Heavy Components and Equipment
Brand: ZSJH

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Top Running Double Girder Overhead Crane for Heavy Components and Equipment

Top Running Double Girder Overhead Crane for Heavy Components and Equipment

For large box sections, heavy plate, equipment modules and fabricated assemblies, a top running double girder crane provides a configuration worth evaluating. Match the bridge, trolley, hook geometry and duty to the actual lifting route and production cycle.
ZSJH Steel can coordinate equipment requirements and building interfaces. Selection considers the heaviest lift, long-term service, maintenance access and the supporting structure together.
Product Benefits
· Suitable configurations can address larger capacities, spans and heavy components.
· Appropriate trolley and hook arrangements can improve the upper hook position, subject to the general arrangement drawing.
· Main/auxiliary hoists, maintenance access and controls can be discussed for the task.
· Drives, braking and service access can be matched to frequent operation.

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Product Description

Structural Arrangement

The bridge runs on top of the elevated runways, with a lifting trolley traversing the bridge. Common arrangements allow the hook to rise between the girders. Main/auxiliary hoists, platforms and cabs depend on the selected equipment and task.

Configuration Guide

Item	Enquiry and selection guidance
Capacity	Example requirements: 5, 10, 16, 20, 32, 50, 63, 80 and 100t; confirm each combination
Main/auxiliary hoists	For a designation such as 20/5t, define each rating and permitted combined operation
Span and coverage	Specify rail gauge, travel, approaches, maintenance space and interference zones
Lift	Define upper/lower hook positions and rigging space, not rail elevation alone
Crane duty	Discuss A4–A6 for suitable tasks; A7/A8 requires service-specific verification
Drives	Electric lift and travel; speed, inverter, creep and synchronization features by system
Controls	Pendant, radio or an engineered cab; capacity alone does not determine the choice
Access and protection	Agree walkways, guardrails, access, limits, emergency stop, brakes and collision protection
Power and environment	Voltage, frequency, feed, heat, humidity, dust and corrosion
Structural interfaces	Wheel arrangement, maximum/minimum wheel loads, horizontal actions and load cases

top-running-double-girder-crane-parts-breakdown

Describe the Duty Before Selecting the Class

Broad group	Information to establish
A1–A3	Standby/lower-intensity patterns and actual load distribution
A4–A5	General cycles, load proportions and intended design life
A6–A7	Intensive cycles, heavier loading and fatigue requirements
A8	Very intensive service with a specifically verified equipment design

These are discussion groups, not assignments by industry or shift count. Confirm crane and mechanism ratings separately, including the applicable GB, ISO, FEM or CMAA standard and edition. Do not use an unverified one-to-one conversion.

Suitable Applications

Consider this type for heavy steel fabrication, equipment manufacturing, thick-plate processing and large assembly bays. Tandem lifting, turning or coordinated cranes require a specific arrangement; capacities are not simply added together.

Double girder construction does not automatically establish A6/A7 duty or a greater usable lifting height in every building. Check roof clearance, rail elevation, trolley envelope and rigging together.

top-running-double-girder-crane-underside-view

Operation and Positioning

Compare radio and cab control against visibility, operator location and access. Discuss fine positioning, inverter control or sway control for assembly work. Main/auxiliary coordination, tandem lifting and automation require defined operating limits and protective functions.

double-girder-bridge-crane-festoon-cable-system

Attachments and Special Conditions

Option	Selection points
General hook	Suitable rigging, lifting points, balance and load route
Lifting beam or magnet	Attachment weight, rating and load distribution; magnets also need workpiece and power-loss review
Grab	Grab type, material density, opening system, total load and duty
Hazardous area	Equipment and component suitability for the classified area and documented certificate scope
Metallurgical/molten metal	A specifically suitable crane and protection design; girder arrangement alone is insufficient

Frequently Asked Questions

Does 20/5t mean a 25t lift? No. Simultaneous use and combined limits depend on the equipment design and technical agreement.

Is double girder always the better choice? Compare capacity, span, duty, clearances, reactions, access and total investment.

Does A6 mean metallurgical suitability? No. Duty does not replace the requirements for molten metal, hot service or hazardous areas.

Request a Coordinated Crane Configuration

Share load information, production cycles and building drawings to discuss equipment, supporting-steel interfaces, separate pricing, agreed inspection and export documents. Define erection, load testing, acceptance, training and service responsibilities in the order.

Primary CTA: Submit Your Double Girder Crane Requirements

Contact: sales@zsjhsteel.com | WhatsApp +86 151 2258 2058

Specification note: Listed capacities, duty groups and options support requirements discussions. Confirm the selected equipment and technical specification; not all combinations are implied available.