GB 50278-2010 Lifting Equipment Installation & Acceptance Code
GB 50278-2010, "Code for Construction and Acceptance of Lifting Equipment Installation Engineering," is a mandatory national standard governing the quality acceptance of lifting equipment installation. It specifies quality requirements and acceptance methods for the installation of various lifting appliances—including overhead, gantry, tower, and mobile cranes—and serves as the mandatory acceptance basis for crane installation projects.
Rail Installation Accuracy Requirements
The standard imposes strict accuracy requirements on rail installation. The span deviation must be within ±3 mm for spans ≤10 m, and within +[3+0.25(S−10)] mm for spans exceeding 10 m. The elevation difference across the rail top surface must not exceed 10 mm, measured with a level instrument along the full length. The rail joint gap is limited to ±1 mm, with a maximum vertical offset of 1 mm at the joint. The rail must be in firm, uniform contact with the runway beam to ensure even load distribution. The rail must also be reliably grounded, with a grounding resistance of no more than 4 Ω.
Rail installation accuracy directly determines the crane's operating stability and wheel service life. Excessive span deviation causes rail gnawing—where the wheel flange rubs against the rail side—accelerating wear on both the wheels and the rail. Excessive elevation differences across the rail top induce additional dynamic loads during crane travel, which can compromise the fatigue life of structural components.
Vertical offset and gap at rail joints are common quality issues. The standard limits the joint offset to ≤1 mm and the gap to ±1 mm—the minimum requirements for a smooth transition as the crane passes over each joint. Rail joints should be positioned near the support points of the runway beam, with adequate support directly beneath the joint. An elastic pad should be installed between the rail and the runway beam for vibration damping and noise reduction.
Load Test Requirements
After installation, the crane must undergo load testing. The No-Load Test requires at least five full travel cycles to verify operating stability and brake responsiveness. The Rated Load Test (100% SWL) involves three lifting and lowering cycles, with the brake slip distance measured at ≤100 mm. The Static Load Test applies 1.25 times the rated load for 10 minutes to check main girder deflection. The Dynamic Load Test runs three cycles at 1.1 times the rated load to confirm reliable braking under load.
>10m:+0.25S
Level Instrument
Offset ≤1mm
Check Deflection
Reliable Braking
Test Report + As-Builts
| Span Range | Deviation Value | measurement method |
|---|---|---|
| S≤10m | ±3mm | Steel Tape with Tension100N |
| 10m< S≤20m | +[3+0.25(S-10)]mm | Steel Tape with Tension100N |
| S>20m | +[3+0.25(S-10)]mm | Steel Tape+theodolite |
The load test is the most direct way to verify the quality of crane installation. The static load test applies 1.25 times the rated load for 10 minutes to check whether the main girder deflection remains within the allowable limits. After unloading, the main girder should recover to its original camber, with residual deformation not exceeding 20% of the maximum elastic deformation. The dynamic load test runs the crane through three operating cycles at 1.1 times the rated load, during which all mechanisms must operate smoothly with reliable braking.
Installation Acceptance Documentation
Documents required for installation acceptance include: the factory certificate of conformity for the equipment, material certificates for major components, the manufacturing license, the installation unit's certificate of competence, installation process records (including concealed work), the load test report, and as-built drawings. All documents must be kept on site for inspection. The crane may only be put into service after acceptance has been completed successfully.
| Test Item | Load | Hold Time | Judgment |
|---|---|---|---|
| No-load | None Load | ≥5Cycles | Smooth Operation |
| rated load | 100%Rated | Each Lift and Lower3Times | Braking≤100mm |
| static load | 125%Rated | 10Minutes | Nonepermanent deformation |
| dynamic load | 110%Rated | 3Cycles | Braking Reliable |
Kelude Heavy Industry provides crane installation services in accordance with applicable standards.
FAQ
Q: What are the main technical parameters for rail installation?
A: Span deviation must be within ±3 mm for spans up to 10 m, and within +[3+0.25(S-10)] mm for spans exceeding 10 m. The elevation difference between rails must not exceed 10 mm. Rail joint gap tolerance is ±1 mm, with a maximum vertical offset of 1 mm at the joint. Rails must be in full contact with the runway beam and properly grounded.
Q: What load tests are performed after crane installation?
A: The testing sequence includes a No-Load Test (minimum 5 cycles), a Rated Load Test at 100% SWL (3 lifting and lowering cycles each, with load drop not exceeding 100 mm), a Static Load Test at 1.25× rated load (held for 10 minutes), and a Dynamic Load Test at 1.1× rated load (3 cycles). After the static load test, camber recovery of the main girder is verified.
Q: What are the installation and commissioning requirements for crane brakes?
A: Braking torque must be at least 1.5 times the rated capacity, with brake clearance set between 0.5 and 1.2 mm. The brake is of the normally closed type, engaging automatically upon power loss. After installation, a brake test is conducted — load drop must not exceed 5 mm under no-load conditions and 100 mm under full load.
Q: What documents are required for installation acceptance?
A: The following documents must be submitted: Factory Certificate of Conformity for the equipment, material certificates for major components, manufacturing license, certificate of competence for the installation contractor, installation records, Load Test Report, and as-built drawings. All documents must be kept on site for inspection.
