Dead Wraps

• Dead Wraps: The first few wraps of the wire rope around the drum (commonly known as the "dead wraps") provide a simple and secure method of anchoring the wire rope to the drum. This (anchoring) is accomplished by the friction (of the dead wraps) tightening against the drum barrel, as a load is applied. As the load on the wire rope increases so does the anchoring effect. It is critical that the recommended number of dead wraps remain on the drum at all times in order for the load to be held. The number of dead wraps varies according to what prevailing agency or regulatory body’s rules are followed.  In the United States, Ingersoll Rand exceeds ANSI / ASME B30.7 (BASE MOUNTED DRUM HOISTS) by recommending that a minimum of (3) dead wraps are kept on the drum at all times.

  (Note: Because of the dead wraps the amount of usable wire rope on the 1^st layer is diminished slightly. This has been factored into each of the drum calculator outputs.