Overhead Crane Load Test
An overhead crane load test is a formal proof test where a bridge/gantry/overhead travelling crane is operated with a known test load (typically 100–125% of rated capacity) to verify that the crane, runway, brakes, controls, and structure can safely handle its rated load in all motions, in accordance with WorkSafeBC OHS Regulation Part 14 / s.14.81 and OSHA 29 CFR 1910.179(k).
On a manufacturing or shop floor, an overhead crane load test is a controlled, documented exercise performed by a qualified person or certifying agency. Steps include planning and isolation (establishing an exclusion zone), using certified test weights, conducting a 100% rated load functional test (verifying lifting, lowering, trolley and bridge travel, limit switches, brakes, and deflection), then a 125% overload proof test (operating all motions and holding the load to observe behavior). Post-test inspection checks for cracks, permanent deformation, and damage. Documentation includes date, loads, results, and corrective actions, integrated into compliance workflows like SafeDesk for scheduling and tracking.
For a new overhead crane in BC, what minimum tests are required before first use, and how must they be run?
Under WorkSafeBC OHS Regulation s.14.81(1.1), with the hook carrying rated load (100%), all crane motions, holding brakes, travel brakes, circuits, controls, interlocks, limit switches, and protective devices must be tested, and structural deflection measured within design limits. With 125% of rated capacity, all motions and brakes must be tested to prove safe handling. At both loads, the load must be travelled over the full length of bridge and trolley runways.
How do WorkSafeBC requirements align with OSHA/ANSI for load testing overhead cranes?
Both jurisdictions treat 125% of rated capacity as the typical maximum proof load. OSHA interpretation states cranes should not be rated in excess of 80% of the test load, so a 125% test supports a 100% working rating. Both require load testing upon initial installation, modification, or significant repair. WorkSafeBC explicitly requires deflection measurement at 100% and full-runway traversal at both loads, while OSHA leaves details to ANSI/ASME/CMAA standards.
Does the runway (support structure) also need proof load testing, or only the crane?
Yes, the runway is explicitly included in WorkSafeBC requirements. s.14.81(1.1) covers runways, and s.14.81(1.1)(f) requires the load to be travelled over the full length of bridge and trolley runways at 100% and 125%, with only successfully tested sections placed into service. s.14.81(3) allows a replacement crane on an existing runway only if its rated capacity and imposed loads are equal to or less than the previously tested runway rating; otherwise, additional runway testing is required.