test 2 Flashcards
wire rope?
individual wires laid into a number of strands
strands?
laid around a center core
wire rope constructions
- ordinary
- warrington
- seale
- filler
lay length?
measured distantce it take one strand to make a revolution around axis
Lang Lay?
wires are laid in same direction
provides greater resistance to abrasion
lang lay v regular
Lang
more flexible
not used for slings or single part hoisting lies
regular lay opposite direction less flexible more stable than lang resist kinking
design?
5: 1 hoisting
10: 1 lifting personnel
formula
WLL
dia^2 x 8
what is BS?
Breaking strength
Formula
BS
F.S x W.L.L
What is FS
Factor of Safety
Formula
FS
BS/WLL
maintenance
lubrication
lang rope has both ends secured
I.W.R.C on a drum
Single vertical hitch
load support one leg
sling 90
WLL Dia^2 x8
sling angels
45 ideal
30 critical
WLL for 3 or 4 leg bridle sling
svh WLL H/Ls= WLL of hitch
Cosby clips
Never saddle a dead horse
spelter sockets
to attach wire to fitting
sholderless
angular loading will reduce WLL,
shoulder types
Must be in full contact
thimbles
used to protect eye hole
spreader equalizer beams
prevents crushing
for long loads/unbalanced
eliminates bad angles
snatch blocks
used to change direction of pull on line
wire and fiber rope
formula for
part of lines
pol= load to be lifted/wll
lead line load
formula
load/lines
formula for
load structure
load+lead line load
chain
inspection what to look for?
bends twists stretched and damage
back splice
stops from fraying
but takes longer
when properly installing wire rope what is its efficiency
80% of working load
safety requirements for rigging?
safety hitch installed
chain grade
AAA, 8, 80, 800
