ISO 9927-11:2016 Bridge Crane Inspection Procedures Explained

Inspection Levels & Frequency

Bridge crane inspections are organized into four levels. A daily inspection is performed before each shift and takes 10–15 minutes, covering the main girder, wire rope, hook, brake, and limit switches. A monthly inspection takes about half a day and includes MPI of the main girder, camber verification (≥ S/2000), crane rail wear (≤ 2 mm), wheel flange wear (≤ 40%), brake lining thickness (≤ 50%), and wire rope condition (≤ 7% wear). An annual inspection spans 1–2 days and involves UT and MPI of the main girder, a 110% load test, camber re-measurement (annual deflection ≤ S/3000), and brake torque verification (±5%). Special inspections are required after installation, overhaul, overload events, or retrofits. If any daily inspection item fails, the crane must not be operated. When initial camber measures approximately 1/1000 — below the 1/2000 threshold — a full structural evaluation is required. Kelude offers annual bridge crane inspection services.

Monthly vs. Annual Inspection Scope

Monthly inspection focuses on the main girder (MPI of mid-span and end T-joint weld seams), camber (≥ S/2000), crane rail wear (≤ 2 mm), wheel flange wear (≤ 40%), brake lining thickness (≤ 50%), and wire rope wear (≤ 7%). Annual inspection adds full-coverage UT and MPI, a 110% load test (deflection ≤ L/400 to L/500), camber re-measurement (annual deflection ≤ S/3000), and brake torque verification (±5%). Inspection records must be retained for at least 3 months for daily checks, 3 years for monthly/annual checks, and 3 years beyond the crane's service life for special inspections.

The inspection regime for overhead cranes is the backbone of lifecycle safety management. A daily inspection, taking roughly 10–15 minutes before each shift, is carried out by the operator. It focuses on the main girder for any visible deformation or abnormal paint cracking, and on both the crane runway rails and trolley rails for debris or grease buildup. The wire rope should be visually inspected along its entire length, from the drum anchorage to the hook connection, paying particular attention to sections in contact with the pulley grooves and the area near the drum anchorage. The hook latch spring must provide sufficient tension with smooth opening and closing of the locking plate. The brake is verified through inching/jog mode to confirm responsive and reliable action, and the limit switches are manually triggered to ensure the travel switch contacts operate correctly.

Periodic inspections are conducted monthly by dedicated maintenance personnel and typically take about half a day. Key tasks include Magnetic Particle Inspection (MPI) of main girder weld seams using a portable flaw detector, focusing on T-joint welds at the mid-span region and end connections, as well as welds at the ends of stiffeners. Before testing, the weld surface must be cleaned down to bare metal, and the magnet yoke spacing should not exceed 100 mm. The camber of the main girder is measured at mid-span using a precision level instrument or the taut-wire method, and compared against the initial camber value. The annual deflection must not exceed S/3000; if the residual camber falls below S/2000, the main girder should be evaluated to determine whether reinforcement is required. Trolley rail wear is measured with calipers—rail head wear must not exceed 2 mm, and any rail section exceeding this limit should be replaced or reconditioned promptly. Kelude Heavy Industry offers annual crane inspections in accordance with ISO 9927-11, performed by certified inspectors using professional testing equipment, with inspection reports issued to recognized national standards.

Frequently Asked Questions