ch. 2 rigging and signaling lms

trunnion

rigging attachment point which is either cast, welded, or screwed onto the object to be lifted

Early Warning Indicator (EWI)

device overload cord that encompasses a Twin-Path sling and culminates at the tag area

ductility

ability of a material to deform before breaking

leg

one sling in a set of slings

master link

forged ring that can be used to attach various rigging equipment

swage

metallic fitting into which wire rope can be inserted and then permanently attached by extreme pressure

shock loading

exceeding a static load by jerking or bouncing the load

alloy

mixture of two or more elements, with at least one being a metal

regular lay

wire rope in which the wires in the strands are laid in one direction and the strands are laid in the opposite direction

lang lay

wire rope in which the wires in the strands and the strands themselves are laid in the same direction

Flemish eye

wire rope that has been separated into two equal parts; the two parts are looped in opposite directions and then laid back together to form an eye

hitch

configuration method used to connect slings to loads, using various hardware

working load limit (WLL)

maximum amount of load that should be placed on rigging materials and equipment during normal service

factor of safety (FOS)

margin of safety for rigging equipment; found by dividing the tensile strength of the equipment by the assigned WLL

softener

protective material placed between the sling and the load