rigging test 2 Flashcards
(33 cards)
three types of ropes in the industry
natural fiber rope, synthetic fiber rope, wire rope
OSHA requires natural fiber ropes be immediately removed from service if any of the following conditions occur
abnormal wear, powdered fiber between strands, broken or cut fibers, variation in the size or roundness of strands
manila rope has limitations because it is subject to what?
rot
synthetic or man-made, fiber ropes have what running their entire length?
individual fibers
how much stronger can a synthetic rope be to a natural fiber rope of the same diameter?
2.5 x stronger
what type of wire rope is considered to be the strongest?
improved plow steel wire
what are the 3 types of wire rope?
mild plow steel wire rope, plow steel wire rope, improved plow steel wire rope
why must steel rope be kept clean and out of the elements?
rust and erosion, can be kinked or bent
should a rope be kept as clean as possible?
yes
should you lubricate your rope with oil?
no
CBS stands for
catalog breaking strength
the average force in pounds needed to break a rope
CBS
WLL stands for
working load limit
the maximum load that should ever be applied to a rope
WLL
what is the design factor for ropes?
5
how to calculate the WLL
CBS / DS = WLL
shock loading, excessive use, exposure to high temperatures, extended periods under load are examples of what?
dynamic loading
arbitrary number used for calculating WLL
design factor
the longest part of the rope is called the
standing part
the free end of a rope used to form the knot
the running end
loop formed at between the standing part and the running end
bight
the weakest part of a rope is at
the knot or splice
eye splice efficiency rating
95%
short splice efficiency rating
90%
