GB/T 28264-2012 Crane Safety Monitoring System Guide
GB/T 28264-2012, Safety Monitoring and Management System for Lifting Appliances, is the dedicated product standard for crane safety monitoring systems. The standard specifies the system composition, functional requirements, performance parameters, inspection methods, and acceptance rules — making it a key reference for intelligent crane safety management today.
GB/T 28264-2012 is the product standard for the crane Safety Monitoring and Management System — commonly referred to as the "black box" — first published and implemented in 2012, and incorporated into the special equipment safety technical specification in 2017. The standard applies to the design, manufacturing, and acceptance of safety monitoring systems used on overhead, gantry, tower, and mobile cranes. By continuously monitoring crane operating parameters and recording historical data, the system provides the technical foundation for safety management, accident analysis, and equipment maintenance. Kelude equips every crane with a safety monitoring system compliant with this standard as standard factory equipment.
System Composition and Functional Requirements
The Safety Monitoring and Management System consists of five functional units: the data acquisition unit, the data processing unit, the display unit, the control unit, and the storage unit. The data acquisition unit incorporates load sensors (pin-type or plate-type), a hoist height encoder, travel encoders for the crane bridge and trolley, an anemometer, and operating status sensors for each mechanism. The data processing unit is built around a master controller (PLC or a dedicated embedded computer) responsible for data acquisition, logic processing, and alarm decision-making. The display unit uses an LCD screen or touch screen (HMI) to show real-time operating parameters of the crane. The control unit triggers audible and visual alarms and automatically cuts power to the relevant mechanism when preset limits are exceeded.
The standard specifies the parameters that must be monitored: lifting capacity (real-time display of the current load, with overload audible and visual alarm and automatic shutdown of hoisting power), lifting height and crane bridge/trolley travel (real-time position display with early warning as limits are approached), wind speed (alarm when the set value is exceeded, and automatic shutdown of travel mechanism power when the extreme value is reached), mechanism operating status (start/stop/fault status of each mechanism), and cumulative operating hours (providing data for maintenance planning). For cranes with a work duty classification of A6 or higher, the system must also monitor the hoisting mechanism brake status (open/closed feedback signals).
A display terminal must be installed in each operator cab, showing: real-time lifting capacity and its percentage of Rated Lifting Capacity, lifting height with upper and lower limit positions, crane bridge and trolley travel positions, operating status indicators for each mechanism, an alarm list, and troubleshooting prompts. The display must be readable under strong ambient light, including direct sunlight. Touch screens must support operation with gloves, with a response time of no more than 0.5 seconds. The system must also include self-diagnostic capability: in the event of a sensor or communication line fault, the system automatically identifies the fault and displays the fault location and fault code on the screen, allowing maintenance personnel to quickly pinpoint the issue.
Performance Parameters and Accuracy Requirements
The standard sets strict accuracy requirements for the safety monitoring system. Lifting capacity monitoring is classified into three accuracy grades: Grade I with a tolerance of no more than ±1%, Grade II with ±3%, and Grade III with ±5%. Lifting height monitoring accuracy must not exceed ±2% FS or ±50 mm, whichever is greater. Travel monitoring accuracy must not exceed ±2% FS or ±100 mm, whichever is greater. Wind speed monitoring accuracy must not exceed ±2 m/s. The system sampling frequency must be at least 1 sample per second, and the alarm response time — from detecting an out-of-limit condition to issuing the audible and visual alarm — must be no more than 1 second.
Data recording (the black box function) is a core feature of the safety monitoring system. The standard requires the system to continuously record the following data: lifting capacity, lifting height, crane bridge travel, trolley travel, working condition (no-load / loaded / overload), direction of travel for each mechanism, brake status for each brake, wind speed, and system power-on/off times. Recorded data must be stored in non-volatile memory, with a data retention period of no less than 180 days after power loss. The storage capacity must accommodate at least 30 days of continuous operation. Data must be stored in a standardized format and exportable via USB or network interface, with tamper-proof protection on exported data files.
The standard also specifies environmental adaptability requirements. The safety monitoring system must operate reliably in crane working environments (temperature range of -20°C to +60°C, relative humidity up to 95% RH). All system components must be vibration-resistant, dustproof, and corrosion resistant. Display terminals must remain clearly readable under direct strong light to meet operational requirements. The system must function normally with a supply voltage fluctuation of ±15%. Protection ratings are specified as follows: indoor components must be rated at least IP43, outdoor components at least IP65. Sensors must have a protection rating of no less than IP65, with load sensors rated at least IP67. Connecting cables must be shielded cable, and all cable joints must be sealed against moisture.
Safety Monitoring System Function Comparison Table
The comparison table below outlines the monitoring parameters, accuracy requirements, and alarm thresholds for each functional module of the Safety Monitoring System, allowing users to verify system selection and installation & commissioning against their specific needs.
| Function Module | Monitoring Parameter | accuracy requirements | alarm threshold |
|---|---|---|---|
| Lifting Capacity Monitoring | Currentload/Rated Lifting Capacity% | ±1~5% | ≥100%Alarm/≥110%Power-off |
| Height Monitoring | Lifting Height/Upper/Lower Limit | ±2%FSOr±50mm | Distance to Limit500mmearly warning |
| stroke Monitoring | Crane Bridge/Trolley Position | ±2%FSOr±100mm | Distance to Limit1000mmearly warning |
| Wind Speed Monitoring | Instantaneous Wind Speed/Average Wind Speed | ±2m/s | 6Beaufort Scaleearly warning/8Scale-based Shutdown |
| Brake Monitoring | open close Status/brake shoe Wear | Discrete Status Signal | Not Open/Not Closed Alarm |
| data recording | All Parameter+Timestamp | Sampling≥1Times/Second | Data Retention≥180Day |
Inspection Methods and Acceptance Rules
The standard specifies two inspection regimes for the Safety Monitoring and Management System: Factory Acceptance Test (performed unit by unit) and Type Test (required for new products or major design changes). Factory inspection items include: Visual inspection, functional check (verifying signal acquisition, display, alarm, and self-diagnostic functions of each sensor), accuracy calibration (Lifting Capacity calibrated with Standard Weight, height and stroke verified against steel tape measurements, anemometer compared with a reference standard), Insulation Resistance Test, and dielectric test. Non-Conforming Products must not leave the factory, and inspection records shall be archived for future reference.
Type Tests shall be conducted at a nationally recognized inspection body. In addition to all factory inspection items, the Type Test program includes: environmental test (high/low temperature, damp heat, salt spray, vibration, and impact test), EMC test, and reliability test. Prototype units for Type Testing shall be randomly selected from products that have passed Factory Acceptance Test, with a minimum sample size of 3 units. Failure of any single test item renders the entire Type Test non-conforming; the cause must be identified, corrective action taken, and the unit re-submitted for testing. Type Testing must also be repeated when core components—such as the Load cell, main controller, or storage unit—are changed.
Installation Acceptance is a critical step for the user to confirm system functionality. Upon completion of installation, the manufacturer and the user unit shall jointly perform acceptance. The acceptance covers: correct and secure sensor installation position and fixing method (the Load cell should be mounted on the hook beam or at the fixed end of the Wire Rope; the height encoder should be installed at the drum shaft end or at the wire rope winding point), proper electrical wiring, display parameters consistent with actual conditions, alarm function verified by simulating overload conditions (e.g., adding Test Weight or tripping Limit switches), and data recording functionality confirmed by running the system for a period and checking the completeness and accuracy of recorded data. Upon successful acceptance, both parties sign the Acceptance Report, which is retained in the equipment file.
System Maintenance and Data Management
Once the Safety Monitoring System is put into operation, periodic maintenance is required. The standard specifies that sensors shall be calibrated monthly: Load cells are calibrated using Standard Weight or a link-type load cell tester, while height and stroke encoders are verified through comparison during actual operation. A software upgrade management log shall be maintained, recording the date, version number, and changes for each upgrade. Data recording shall be exported and backed up regularly—at least once a month (or as required by local special equipment regulatory authorities). Backup data should be stored separately on media that is moisture-proof and magnetically shielded.
Analysis of exported data is key to realizing the management value of the Safety Monitoring System. Reviewing the load capacity chart reveals the equipment's workload distribution and overload frequency, providing a basis for equipment Maintenance and structural fatigue assessment. Analyzing travel paths and stroke records helps evaluate whether operators follow proper operating practices. The recorded data also serves as critical evidence in accident investigations—the working condition of each mechanism, operator actions, and their chronological sequence before and after an incident are fully documented, enabling the investigation team to objectively reconstruct the event. User units should establish a data analysis and accident prevention mechanism, translating monitoring data into concrete safety management improvements.
FAQ
Q: Is the Safety Monitoring System mandatory?
A: Under the TSG 51 Safety Technical Specification for Special Equipment, overhead-type and gantry-type cranes with a Work Duty of A6 and Above, as well as Tower Cranes and Bridge erecting machines, are required to be fitted with a Safety Monitoring and Management System. For other types of cranes, installation is recommended but not mandatory.
Q: Should I choose a pin-type sensor or a plate-ring type load cell?
A: The pin-type sensor is installed at the hoisting pulley shaft of the hook beam, taking up no additional space, but its accuracy is more affected by the fleet angle of the Wire Rope. The plate-ring type load cell is mounted at the fixed end of the Wire Rope, offering higher accuracy but requiring more installation space.
Q: Can exported monitoring data be modified?
A: The standard requires data to be tamper-proof. Raw record files are stored using encryption or checksum methods—any modification will break the file's integrity verification. For readable export formats, the system must generate non-editable report files.
Q: Can a Safety Monitoring System be retrofitted to older cranes already in service?
A: Yes. The standard allows the Safety Monitoring System to be installed as a standalone product on cranes already in operation. During retrofitting, careful attention should be paid to sensor installation position and method to ensure the original structural load-bearing state of the equipment is not altered.
