The adequacy of a crane’s load line to support the weight of the object being lifted is an obvious concern when evaluating a crane lifting operation. Less obvious, but often equally important, is the presence and adequacy of taglines to provide control of the load orientation.
Taglines are simply ropes or lines that are (more…)
Heavy machinery fires are often caused by hydraulic hose failures. Pressurized hydraulic fluid escaping from a failed hose assembly can be atomized into a fine spray that can be ignited by heated engine surfaces such as the engine exhaust or turbocharger.
Hydraulic hoses near the engine compartment of an excavator that burned.
Hydraulic hoses often fail due to age and wear, requiring regular inspection and replacement of hydraulic hoses to prevent failures. Hoses may also fail if they are misrouted. Misrouting can lead to the hose being pinched or causing it to chafe against a sharp metal surface.(more…)
Hydraulic cranes absolutely rely on the integrity of their high-pressure fluid systems for safe operation. A crane can become out of level when an outrigger cylinder leaks over time, possibly leading to a tip over. A boom can collapse if a hydraulic hose ruptures. It is not possible to absolutely prevent hydraulic cylinders from developing leaks or prevent hoses from rupturing during the life of a typical crane, therefore crane manufacturers provide load holding valves at key components to prevent these dangerous incidents. In fact, ASME B30.5, Mobile and Locomotive Cranes, requires load holding valves or equivalent devices at outrigger cylinders, boom support cylinders, and boom telescoping cylinders. (more…)
A production building was being constructed at a cement plant. A large crawler crane was being used to install the pre-assembled metal wall framing of the building. The weights and lift radii of the four wall framing sections, along with the rigging spreader and other lift equipment, were within the rated capacity of the crane. (more…)