Review Flashcards
Test
how do you determine that Manila rope may be used for rigging purposes?
By the color of the strand
list three natural fibers rope materials?
Vanilla, cotton, hemp
what Lay of rope is generally recommend for rigging purposes?
Regular Lay
Rope is sized by its?
outside diameter
How should rope be stored?
in a moisture free container
what type of knot is used when running it through a pully?
Eye splice
safe working load formula for wire rope is?
D^2x45
to prevent fraying of a rope you can_
whipping or seizing
when cutting synthetic wire rope By Flame cutting or melting what two precautions should be taken?
melting material and inhaling flames
what splice is used for making a permanent loop at the end of the line
Eye splice
what are the four major requirements for rope fastening
it will not slip
knot is strong and suitable for the job
easy to tie
easy to untie
what is the best knot to use to keep the end of a rope from running out of a tackle or pulley
A figure eight knot
what type of knot should not be used to hoist pipe
clove hitch
another term for square knot is
Reef knot
most commonly Miss tide knot is
a square knot for a reef knot
commonly mistaken by a square knot
a granny knot
what is the purpose of a bowline on a Bight
to have a loop anywhere on the rope
most of the wire selected for making wire rope is made from two grades of Steel name these two grades and provide their tensile strength
IPS 240,000 lbs per square inch
EIPS 10% more than IPS
what is the purpose of a sheet Bend
ting two unequal size rope together
what are the five purposes for the core of a wire rope
maintain its shape prevent strands from rubbing against each other absorbing shock adds 7 to 10% strength lubrication
what about the construction of wire rope determines its flexibility
the number of strands
what is the definition of lay as its used regarding rope
Olay is the distance it takes to make one complete Revolution with a strand
multiple Part slings are referred to as
bridles or spreaders
When selecting sling types and sizes what eight factors should it be based on
wieght of load shape and balance how to lift it size of load overhead room environment it's load capacity is marrying the material possible
three basic hitches
a basket hitch a straight hitch and double hitch
slings that are damaged or defective can be used on lighter loads
slings should always be taken out of service when damaged or defective
the surrounding area of a load to be hoisted by helicopter should be cleared of debris within how many feet
100 feet
list of PPE required for helicopter lift
chin straps rubber gloves light clothing eye protection
what is a crane?
mechanical means to move heavy loads safely
before starting to hoist note the following conditions?
the Hoist rope shall not be kinked
the multiple part line shall not be wrapped on each other
the hook shall be brought over the load in such a manner as to prevent swinging
the tagline she’ll be a fix to all those prevent on leveling or control swing of objects to be hosted
a cranes footing shoulb be level within 1 degree
the pic should be within five degrees
Journey workers must be competent and should know the following
establish wieght
judge distance
select table and load
rig safely
who is General responsible for the safety of a lifting operation as soon as load is lifted
the crane operator
What distance must be maintained from a high-voltage source by a crane
15 feet
when are bells or whistles used as signals
on a blind pick
what type of chain Hoist is commonly used in our trade
a spur gear
never use a chain hoist for a
horizontal pull
when do you due a visual inspection of hardware or rigging equipment
Before AND after
counting the number of supporting ropes of a block and tackle gives you the
mechanical advantage
what is the lower block of the crane called
the main block
what Jack type has the simplest Construction
she ratchet Jack
what type of Jack is used for loads over 25 tons
a screw jacks
metal to metal jacking
is never permitted
when using Jacks in a horizontal position to move an object the Jack should be
tied up
the diameter of the loop formed in a wire rope should be?
eight times the diameter of rope
an eye formed by wire rope clips provides what rated capacity
80%
the space between wire rope clips should be equal how many times the diameter of the Rope
6 times
what metal is used to pour the sockets of fittings joining wire ropes
zinc
a hook should be painted
never
what type of shackle is most commonly used in our trade
anchor Bow shackles
how do you determine the size of a shackle
by the size of the bow
what is the 3/6 rule
3 broken wires in one strand or six broken wires randomly distributed among all strands within one lay length
how is load radius of a crane determined
the crane manual
The Single Leg of a bridle sling should be able to carry
the entire load
where is the slewing ring located on a fixed Tower configuration
on the top of the tower
what should be used if more than one lifting cable is to be handled by a chain hoist
Shackle
when drifting loads the angle it should not exceed how many degrees from vertical
30 degrees
the weakest part of a chain hoist or chain fall is
bottom of the hook
what are four basic types of jacks
hydraulic
rachet
screwed
pneumatic
wire core is how many times stronger than fiber core
7 1/2 times stronger
wich wire rope class is listed as non rotating?
35 strand
wich class of wire rope is listed as spin resistant?
8 strand wire rope
wich class of wire rope is listed as rotation resistant?
19 strand wire rope
wire rope should be replaced if the wear in the outer strand wires exceeds?
1/3 of its original diameter
wich product is suitable for lubricating wire rope?
light mineral oil
what happens when a wire rope is bent around a sheave or hook?
nominal strength is reduced
1 inch wire rope eye sling lifting a load with a 1 inch shackle will be approximately how efficient?
50 %
with in “improved plow” wire rope sling the preferred D/d basket hitch ratio is
25 to 1
shackles are only rated for their maximum capacity when used for what type of pull
straight line pull
with two shackles or eye sling eyes in a hook, what is the suggested maximum included lifting angle?
90°
a wedge socket must be attached with the load line pulling in a straight line pull from the?
Pin
custom fabricated lifting beams or any homemade lifting device must be?
- designed by an engineer
- have a rated capacity clearly stamped
3 be test lifted at 125% of its rated capacity
what is the mechanical advantage ratio created on the top fixed sheave of six block hoisting system?
none
when determining the number of parts of a line needed for rigging a system. what unknown factor makes the use of a ratio chart a necessity?
friction
if the wire rope hoist line coming off a drum is fed into a sheave how must the sheave be positioned?
aligned with the fleet angle
what’s the fleet angle on a grooved drum?
2° fleet angle
30 feet from half the drums width per ft
what’s the fleet angle of a smooth drum?
1 1\2° fleet angle
40 ft for half the drums width per ft
air operator taggers remove moisture in the lines by
blowing them out first
the most commonly used grade of natural fibers rope is ?
Manila
knots in fiber rope reduce strength by?
50%
which splice is used when forming an eye around fiber rope?
side splice?
which not can be used as a rescue knot?
Spanish bowline
what’s known as the killer knot?
reef knot or square knot
critical lift conditions?
- when lift is over operating or electrical equipment
2.when modified crane or equipment is needed
3.the wieght of the load exceeds set limits
2 cranes - any laid over 75% cranes capacity
short splice?
short splice doubles the diameter
what knot doubles the diameter?
short splice
Eye or side splice
to make eyes in fiber rope
knot that makes eyes in fiber rope
Eye or side splice
three parts of a rope
- running end
- bight
- standing end
knot to rig pipe with rope?
pipe hitch
catspaw
to attach load to hook?
on a four part pick, how many slings are holding the load?
two slings
to invert a load you want the heaviest part of a load to be ?
on the bottom
sheave diameter rule
20 times the diameter of rope
alloy of a lifting chain
88 or 8
8
