Mobile cranes can be mounted on wheels or tracks to be moved from one job site to the other. These simple machines are comprised of a hoisting mechanism and pulleys or sheaves.Ĭranes can be broken into two categories: fixed and mobile. They use one or more simple machines to create a mechanical advantage to lift large loads. Both have the capability to raise loads to a considerable height, so precautions and personnel qualifications are similar.Ĭranes and derricks differ in how they are constructed and function.Ī crane is a machine used for moving materials vertically and horizontally. If you look up regulations for cranes, they often include derricks, as they are both used for lifting and moving loads. ASME B30.6 identifies 8 types of commonly used derricks and provides guidance on the construction, installation, operation, inspection, testing, and maintenance of these derricks. OSHA often refers to these two lifting machines together.ĪSME has a complete standard dedicated to Derricks:ĪSME defines a “derrick” as an apparatus consisting of a mast or equivalent member held at the head by guys or braces, with or without a boom, for use with a winching mechanism and operating ropes. Cranes whether fixed or mobile are driven manually or by power.Ī "derrick" is an apparatus consisting of a mast or equivalent member held at the head by guys or braces, with or without a boom, for use with a hoisting mechanism and operating ropes. So how do you tell the difference?įirst let’s look at how OSHA defines them :Ī crane is a machine for lifting and lowering a load and moving it horizontally, with the hoisting mechanism an integral part of the machine. Load Handling for Underground ConstructionĬommonly found at construction sites and industrialized areas, cranes and derricks are both used for heavy lifting and transporting material.Freestanding or Ceiling-Mounted Rail Structures.
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