ISO 9927-1:2013 Crane Inspections: General Principles Explained

Inspection Classifications and Intervals

Kelude Heavy Industry manufactures in strict compliance with national standards. ISO 9927-1:2013 classifies crane inspections into three categories: Routine Inspection—a visual and functional check performed by the operator before or after each use of the crane. Key focus areas—brakes, wire ropes, hooks, limit switches, and the control system—ensure the crane is safe to operate that day. Routine inspections do not require written records—however, any abnormality found must be recorded and reported. Periodic Inspection—a thorough examination carried out by a qualified inspector at predetermined intervals. The inspection interval is determined by the crane's work duty (A1 to A8) and operating environment—typically recommended every 3 months (A8) to every 12 months (A1). Periodic inspections must cover all safety-critical components of the crane and result in a written inspection report. Special Inspection—a dedicated examination required under the following circumstances: after major repairs or retrofits; after an overload or impact incident; before recommissioning after prolonged inactivity (more than 3 months); when the operating environment changes significantly (e.g., relocation to a corrosive environment or after an earthquake); and when load spectrum assessment per ISO 12482 indicates cumulative damage D > 0.8. The purpose of a special inspection is to confirm whether the crane remains fit for safe use after an abnormal event. The standard also specifies inspector qualification requirements—routine inspections are performed by the operator, periodic inspections by a trained crane inspector (or engineer), and special inspections by an expert with a mechanical engineering or crane-specialist background.

Routine Inspection Checklist

Routine inspection items defined by the standard: Brakes—verify the brake releases properly when power is applied (observe whether the brake shoe lifts off the brake wheel)—confirm the brake engages immediately upon power loss (by visual and audible check)—ensure brake clearance is normal (no dragging or rubbing noise). Wire Rope—perform a quick visual check along the full length—look for obvious broken wires (more than 3 within one lay length must be recorded), visible wear (noticeable reduction in diameter), and any kinking or twisting. Hook—visually inspect for cracks and deformation—verify the hook safety latch (spring-loaded) is intact—confirm the hook rotates freely within the hook block. Limit Switches—Hoisting Height Limit Switch—manually actuate the limit push rod—verify it cuts off the hoisting motion (the hook must stop rising). Travel Limit Switch—trigger manually—verify it cuts power to the travel mechanism. Pendant or Remote Control—confirm all buttons function correctly—verify the Emergency Stop Button cuts off main power when pressed. Crane Rail (Gantry Crane)—quick visual check—ensure the rail is clear of obstructions—confirm rail clamps are secure. The standard emphasizes—any abnormality found during a routine inspection (no matter how minor)—must be recorded immediately and reported to maintenance personnel—the crane must not be operated until the fault is rectified. All abnormalities must be logged in the operation log (including date, inspector name, description of the abnormality, corrective action taken, and the name of the person who confirmed the resolution).

Periodic Inspection Checklist

Periodic inspection items defined by the standard: Steel Structure—camber measurement of the main girder (overhead and gantry cranes)—measure mid-span camber using the wire method or a Laser Distance Sensor—compare against the original value (if deflection exceeds 1/700 of the span, an assessment is required; if camber is lost entirely, the crane must be taken out of service). Visual inspection of weld seams on primary load-bearing members (main girder, end carriage, outriggers)—perform MT or UT flaw detection on any suspicious areas. Corrosion inspection of the steel structure—measure corrosion depth (if it exceeds 10% of the original wall thickness, replacement must be evaluated). Mechanisms—inspect reducer gear tooth surfaces (open the inspection window to check for pitting and wear—if pitting covers more than 15% of the tooth surface, the gear must be replaced). Check bearings (replace if abnormal temperature or vibration is detected). Measure drum groove depth (if wear exceeds 25% of the wire rope diameter, the drum must be replaced). Brakes—measure brake shoe wear (replace if remaining thickness is less than 50% of the original). Measure brake spring free length (replace if shortened by more than 5%). Inspect the brake wheel or disc surface (if scoring depth exceeds 0.5 mm, resurface or replace). Wire Rope—measure the diameter along the full length (measure at approximately 1 m from the end on an unloaded section—discard the rope if wear exceeds 7% of the nominal diameter or if the number of broken wires within one lay length exceeds 10% of the total wire count). Electrical System—Insulation Resistance Test (≥1 MΩ)—Grounding Resistance Test (≤4 Ω)—inspect contactor contacts (replace if severely pitted)—visual inspection of cables (replace if the sheath is cracked or aged to the point of exposing conductors). Safety Devices—accuracy verification of the Load Moment Limiter (LML)—functional verification of limit switches—functional check of the Anti-Collision Device. Upon completion of the periodic inspection, an inspection report must be issued—including the inspection date, inspector signature, results for each item (pass/fail/repair required), and the date of the next inspection. Non-conforming items must be marked in the report with a corrective action deadline and the responsible person.

Inspection Records and Documentation Management

The standard's requirements for inspection records and documentation management: Routine Inspection Records—operation log (brief record of pre-use inspection results)—daily report (abnormalities found and corrective actions taken). Periodic Inspection Records—complete inspection reports (including photos and data)—retained at least until the next periodic inspection is completed. Maintenance Records—a record of every repair or component replacement (including the part name, specification, quantity, date, and the maintenance provider)—retained until the crane is scrapped. Load Test Records—a report of each load test (including test date, test load, results, and the tester's signature)—retained for at least 5 years. Incident and Abnormality Records—every overload, collision, accident, and safety device activation event—must be documented in detail (time, cause, consequences, and corrective measures)—retained until the crane is scrapped. Documentation Management Responsibility—the user unit must designate a responsible person or engage a professional organization to manage the crane's safety-related technical documentation—ensuring all records are complete and traceable. When a crane is transferred, all technical documentation must be handed over to the new user unit along with the crane. The standard emphasizes—a crane lacking complete inspection records must undergo a comprehensive safety assessment—it must not be put into service until the assessment report is issued—a crane without documentation is considered to be of "unknown condition"—and may be the most dangerous piece of equipment on site.

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