BS 2573 Crane Design Rules Explained: Key Requirements
BS 2573 Rules for the design of cranes standard is a key technical specification for the crane industry. Developed by the British Standards Institution, it serves as the general design specification for cranes.
The standard provides a unified technical basis for designers, inspection bodies, and users. Kelude strictly adheres to its technical requirements throughout product development and manufacturing.
Scope and Application of the Standard
BS 2573 sets out the technical requirements for the design of lifting appliances, covering all types of cranes with a Rated Lifting Capacity above 0.5t. It applies not only to the design and manufacturing of new equipment but also provides clear technical guidance for the inspection, maintenance, and modification of cranes already in service. The standard aligns with the EN 13001 Crane Safety Standard series and ISO 4309 Wire Rope Inspection Standard, forming a comprehensive technical specification framework. Its clearly defined Technical Parameters and Safety factor requirements give designers a solid design basis and offer third-party inspection bodies quantifiable acceptance criteria for Type Test and Factory Acceptance Test procedures. As a critical component of the crane standard system, it works in concert with the EN 13001 series and ISO 4309 to establish a complete technical specification framework.
Core Technical Parameters and Design Basis
Compliance with BS 2573 requires that crane design and manufacturing meet a stringent set of Technical Parameters. These parameters, established through extensive test data and safety engineering principles, govern everything from material selection to structural design.
Comparative Analysis of Key Technical Parameters
| item | technical requirements | description |
|---|---|---|
| design method | allowable stress method(main) | steel structure BS (British Standard) 449consistent |
| Safety factor | 1.5(Main Girder)/1.67(End Carriage)/2.0(lifting head) | dynamic load factor1.1~1.4 |
| Deflection | Full load≤L/800, Side bow / lateral bow≤L/2000 | No-load Camber≥L/1500 |
| fatigue design | A6classand Aboveshall | BS (British Standard) 7608fatigue design |
| Welding | BS (British Standard) 5135 Arc welding of carbon and manganese steels Welding Specification | equivalent AWS D1.1requirement |
| Test | BS (British Standard) 1757crane Test | 1.25timesstatic load+1.1timesdynamic load |
Inspection Requirements and Intervals
Factory Acceptance Test (FAT) is performed on every unit at the manufacturer's facility by the quality inspection department. Each unit that passes the test is shipped with a detailed inspection report and a Certificate of Conformity. For equipment already in service, the periodic inspection interval must not exceed 12 months.
| item | technical requirements | description |
|---|---|---|
| Main Girder Deflection | Level Instrument | annual+≤L/800 |
| Weld Seam UT | main Weld Seam100% | annual+BS (British Standard) 5135 Arc welding of carbon and manganese steels |
| Load test | 1.25static factor+dynamic1.1times | annual+major modification |
| coating corrosion protection | damage>5%repair | annual+thickness measurement |
Safe Operation & Operator Qualification Requirements
The standard places strong emphasis on operator qualification and training, requiring that all operators complete specialized training and obtain the necessary certifications before operating the equipment.
FAQ: Design Standards & Structural Safety
Q: How does BS 2573 Rules for the design of cranes standard define the structural safety factor classification?
A: Safety factors are graded from 1.5 to 2.0: 1.5 for the main girder, 1.67 for the end carriage, and 2.0 for the hoist. Dynamic load factors range from 1.1 to 1.4.
Q: What deflection limits does BS 466 Overhead travelling cranes specification set for the main girder?
A: Under full load, vertical deflection must not exceed L/800, and lateral bow (side deflection) is limited to L/2000. At no-load, the camber must be at least L/1500.
Q: When does BS 2573 require fatigue strength calculations for the steel structure?
A: Fatigue design in accordance with BS 7608 is mandatory for cranes classified as A6 and above.
Q: What load test procedures and acceptance criteria does BS 2573 specify for factory testing?
A: Per BS 1757, the crane must withstand a static load of 1.25 times the rated capacity for 10 minutes, followed by three cycles of dynamic load testing at 1.1 times the rated capacity.
Kelude Heavy Industry — Specialized in crane design and manufacturing.
