week 3 (chapters 5-7) Flashcards
why are synthetic slings popular among the power delivery industry?
they are non-conductive
what are the three configurations of synthetic, wire rope, and chain slings?
vertical/choke/basket
the working load limit of a a sling depends on its?
configuration
a choke is worth about half the weight of a ________ confirmation
vertical
a basket is worth about twice as much as a ________ configuration?
vertical
you should use a _______ configuration only when a _______ configuration is not possible? why is this the case?
choker/basket………reduces the strength of the sling
when a sling is rigged form each corner of a piece of equipment to the lifting eye, this is called?
a bridle
using a choker has what benefits?
allows the sling to bite down
minimizes slip/travel
why is the basket configuration the strongest?
it divides the weight between each eye
what is the most common material used to make synthetic slings?
nylon
slings with missing name tags must be immediately _______ ___ ________?
removed from service
what does the name tag on a sling provide?
WLL of choker, basket, and vertical configurations
what are the 6 types of web slings?
type 1) triangle choker
type 2) triangle to triangle
type 3) flat eye and eye
type 4) twisted eye and eye
type 5) endless
type 6) reversed eye
sling with two different sized triangle eyes on each end……
Type 1) triangle choker
triangle metal eyes on each end of the same size
type 2) triangle to triangle
eyes woven in each end and can be used in ether of the three configurations?
type 3) flat eye to eye
eyes at each end….BUT, have eyes sewn at right angles for chokers and baskets?
type 4) twisted eye and eye
continuous loop……………….
type 5) endless
multiple widths of webbing help edge to edge stitched together through the middle/wear pads/high strength……?
type 6) reversed eye
synthetic slings should be _____ before each use?
inspected
synthetic slings are made the same as _____ ________ and therefore wear the same?
synthetic ropes
do not subject synthetic slings to _______?
heat
never consider synthetic slings to have _______ properties?
insulating
cover up _____ _______, and ________ before the use of a sling?
sharp edges, corners
when not in use, synthetic slings must be stored clean dry and out of the sun due to ______?
damage from UV light
a sling with a knot in it has an efficiency rating of?
0%
strand laid single leg, eye to eye IWRC 6x19 describes what?
wire rope sling
chains have what common uses?
securing loads
providing rigging attachment points
lifting and moving poles and other equipment
chains that are used for lifting, rigging, or hoisting must be a minimum of?
grade 80 alloy
chains used for setting poles are marked CO or CP, what do these abbreviation mean?
describes the master link and choke configuration
CO = choke, oblong link
CP = choke, pear shaped link
what are the two types of shackles used in the power delivery industry?
material and rigging
which shackle uses a screw pin, which uses a cotter pin?
rigging……..material
a sling in a vertical configuration has a tension that is _____ to the load weight?
equal
as the sling angle decreases, the tension on each sling ______ substantially
increases
what is the formula for solving sling tension?
sling tension= length/height x weight/# of slings
load capacities, boom position, operational zones, and notices/warnings are all found where?
load angle chart
why must workers always refer to the boom operational charts before operating a boom vehicle?
because operational zones vary greatly
what is the STRONGEST position for a boom?
highest angle, fully retracted
the ability for a digger Derick to lift an object within its max capacity depends on what two factors?
hook radius
sheave height
booms of material handlers, (backhoe), are designed for use in almost any combo of angles but only when_________?
truck is level
aerial lifts have ______ _______ to allow ground personnel to operate the eqip from the ground.
override controls
when using a backhoes digging boom, all workers must stay _______ of the backhoe unless authorized by the operator
out of the swing radius
