Rigging and Lifting Flashcards
Wire rope consists of small diameter wires wound around a small core to create what?
A strand
Strands (normally 6) are wound around a steel or fibre core to create what?
A rope
Larger diameter wires on the outside or contact layer have better _______ resistance than small wires
Abrasion
Steel-core rope resists _______ better than fibre-core rope
Crushing
The more strands in the rope, the more ______ it will be
Flexible
The fewer the wires in a rope, the ______ the strength
Greater
_____ -lay ropes are the most common used
Right
What type of rope must be used in salt water applications?
Galvanized
What type of rope must be used in corrosive acidic environment?
Stainless steel
Improved plow quality grade rope has a breaking load of what?
110 to 120 tons per square inch
What are the four types of cores?
Fibre Core, Independent wire rope core, wire rope core, strand core
When are IWRC or WRC ropes used?
For sudden heavy loads, crushing, or heat
Lang lay has the wires twisted in which direction?
The same direction
What are the advantages of Lang lay?
More flexible, more contact area with drum spools or sheaves, wear longer
What are the disadvantages of Lang lay?
Both ends must be permanently fastened to prevent unwinding, not used in single part lift, not used with swivels, not used with slings, not crush resistant
