Rigging Procedures - Part A Flashcards
1
Q
Label this.
A
2
Q
What 5 factors should you consider when using wire rope?
A
- Strength
- Flexibility
- Resistance to abrasion
- Resistance to rotation
- Resistance to corrosion
3
Q
What are three types of cores for wire rope?
A
- Independent Wire Rope Core (IWRC)
- Fibre Core
- Wire Strand Core (WSC)
4
Q
Label these.
A
5
Q
Which wire rope core is used for lifting needs?
A
Independent Wire Rope Core (IWRC)
6
Q
What are some benefits of IWRC
A
- Increases ropes resistance to crushing
- will stretch less than fibre cored ropes
- Increased tensile strength
7
Q
Fibre Core of wire rope is made out of __________.
A
- Sisal
- Manila
- Synthetic Materials (polypropylene, nylon)
8
Q
What are some benefits of Fibre Core?
A
- Increase flexible
- Increases elasticity
9
Q
When should you not use Fibre Core rope?
A
- Should not be used in situations where temperatures are elevated.
- If they are frozen (become brital)
10
Q
What do you NOT use Wire Strand Core rope for?
A
Hoisting
11
Q
What are WSC used for?
A
- Standing ropes such as crane pendants and guy lines on transmission towers.
12
Q
Name which characteristics match with what kind of rope.
A
- Ordinary
- Warrington
- Seale
- Filler
13
Q
All classifications of round ropes consider the __________.
A
- Number of wires
- The size of the wire
- Where they are in the strand
14
Q
What kind of strand construction is this?
A
15
Q
What kind of strand construction is this?
A
16
Q
What kind of strand construction is this?
A
17
Q
What kind of strand construction is this?
A
18
Q
How do you measure diameter of wire rope?
A
Measure across the crowns not the flat sides.
19
Q
How many times should you check a diameter measurement for wire rope?
A
Three on 6 strand ropes and 4 on 8 strand ropes.
20
Q
When you order rope, you must consider what?
A
- Length of rope
- diameter of rope
- type of steel (grade)
- type of core
- type of lay
- strand classification
- whether you prefer preformed or non preformed
21
Q
What are the value for these?
A
- 3/4
- 2
22
Q
What is the equation for calculating tension for a slings?
Is this recommended for use on slings with more then two legs
When should you not use this equation?
A
- No, but you still can use it
- When the load is not even and there is more then two legs.
23
Q
What is one major problem with using slings that have more then 2 legs?
A
The weight may not be equal on all legs.
24
Q
At an angle of 30 degrees with two slings sharing a load of 40,000 pounds. How much weight is on each sling indiviually?
A
40,000 pounds
At 30 degrees two legged slings take the full weight of the load on each sling
25
Name 4 types of slings.
- Wire Rope Slings
- Flemish Eye Splice
- Chain Slings
- Wire Mesh Slings
26
Label these.
27
When should you use Flemish Eye Slice?
On all hoisting slings in order to form a sling eye.
28
Spliced eyes should use ?
Thimbles, a steel sheave that conforms to the rope size.
29
What do thimbles do?
Prevent rope flattening in sling eye and protects the eye from wear.
30
- Name five wire rope sling ends
- Label these
- Thimble
- Hook
- Cresent Thimble
- Slip Thru Thimble
- Choker Hook
31
Where do you use Chain Sling?
With rough handling or heat.
32
Where do you use Wire Mesh Slings?
Loads are abrasive or hot or tend to cut.
33
Name two Synthetic Fibre Slings
- Nylon
- Poyester
34
Name the characteristics of Nylon slings
- Very Strong
- High Elesticity
- Affected by acids and bleaching agents
- Resistant to most types of alcohol, alkalis and hydrocarbons
- Seriously degraded at temps above 200F
- Degraded by UV radiation
35
Name some characteristics of Polyester.
- Very strong
- less elasticity then Nylon
- Affected by Alkalis and Aldehydes (oxidated alcohols)
- Seriously degraded by temps above 200F
- Degraded by UV radiation
36
Name some Synthetic Web Sling advantages.
37
What do you inspect in Synthetic Web Slings
- Wear to the eyes and fittings
- Distortion of the fittings
- Cuts, holes, snags and frayed material
- Ripped stitching
- Burns, melting and charring
38
Are you allowed to repair slings?
What do you do?
- No
- If damage is found you must cut them up to prevent further use
39
What type of end fittings are these?
Triangle and choker fittings
40
What type of end fitting are these?
Triangle end fittings with straight and basket hitch only
41
What end fittings are these?
Double eye sling
42
What type of fittings are these?
Reverse eye sling
43
What type of end fitting are these?
Endless or grommet sling
44
What type of end fitting are these?
Return Eye Sling
45
What is the rule of thumb for Nylon single ply Web SWL weight tolerance?
1600 pound per inch in width.
46
Name some Round Sling advantages.
- Have low stretch (reduces sling and load abrasion and low head room lifts)
- UV protective cover
- Abrasion protection cover
- Seamless
- High strength to weight ratio
47
When should you inspect wire ropes?
Before use
48
What should a record of slings keep?
- Rope size
- Construction and length
- Date of service
- Defects and Length during inspections
49
When do you replace Running Ropes
- Signs of breakage in the valleys between the strands
- Six or more broken wires in one rope lay
- Three or more broken wires in one strand in one rope lay.
50
When do you replace standing ropes?
- Three or more broken wires in one rope lay
- Breaks near such attached fittings as sockets or swaged eye splices
51
Is running a single sling through a pair of eyebolts okay?
No, always use two slings and shackles
52
How should load pull on eyebolts?
Always to the plane of the eye.
53
Can you use washers to fill the gap between the eyebolt shoulder and the surface.
Does the shoulder always have to be in contact with the surface ?
Yes
Yes
54
What is the minimum tapped hole depth for eyebolts?
One and a half times the bolt thread nominal diameter
55
What are these?
Pull Hoist Rings:
Side and Centre
56
Name three types of shackles.
- Anchor and Chain Shackles
- Web Slings Shackles
- Round Sling Shackles
57
Name this
Screw Pin Anchor Shackle
58
Name this.
59
Name this
Safety Type Anchor Shackle
60
Name this
Screw Pin Chain Shackle
61
Name this
Round Pin Chain Shackle
62
Name this
Saftey Type Chain Shackle
63
Where can you find the safe working load of a shackle?
What is it in?
- Stamped on the bow of the shackle
- Tons
64
How are shackles sized?
Diameter of the bow. NOT THE PIN
65
What are these?
Web Slings Shackles
66
when should you not use round pins in shackles?
If the pin could roll due to sling movement
67
With regard to shackles. Where should the live end of a sling be?
Where should the static eye of the sling be?
- Running through the bow section of the shackle
- connected to the shackle pin
68
Are you allowed to lift a shackle at an angle.
No always pull at a proper angle. Lifting else where lowers the rating.
69
Where should a hook sit in a shackle?
Where should the sling sit?
- Pin
- Body of the shackle
70
What should you do when shackles are damaged?
Throw them out immediately
71
When do you use Wire Rope Clips?
When you make an eye in wire rope or attach wire rope to equipment.
72
What are the two main types of wire rope clips?
- J-clip (double saddle and bolt)
- U-bolt (single saddle or Crosby Clip)
73
Name and label these.
74
When applied properly how much load can Wire Rope Clips take compared to wire rope?
80% of the Wire Rope strength
75
Can you install a J-Clip incorrectly?
No
76
What do you do before cuting a wire rope?
Seize the ends with a thin wire.
77
When using a U-Bolt where does the U section sit?
On the dead/ short end of the rope.
78
What is the equation to find the number of U-Bolts and Saddle type clips on Wire Rope?
Number Clips = Rope diameter x 3 + 1
Round to the next whole number.
79
What is the Clip Spacing equation for U-Bolt and Saddle type
CS = rope diameter x 6
80
What is the Clip Spacing equation for Integral and Bolt type clips
CS= rope diameter x 7
81
What is mousing a hook?
When you tie wire around the end of a hook to prevent anything from falling off the hook.
82
When should you use a Headache Ball?
If you use a hook with a single part line
83
What is the purpose of a Headache Ball?
To keep the load line taut on the hoist drum when no load exists on the hoisting line.
84
What is a Wedge Socket?
A device you use to attach the Headache Ball, Swivel or Hook to the load line of a crane or hoist.
85
When is a Wedge Socket used?
When changing connection frequently.
86
What is the name of the traveling block in the set of a crane lift?
Crane Block
87
Which is heavier and why, a Crane Block or a Wire Rope Block?
Crane Block due two the addition of cheek weights on the side plates.
The extra weight keeps the wire rope tight and ensures that it spools correctly onto the winchdrum of the crane.
88
What are these?
89
What do the upper satationary sheaves in a wire rope block do?
Change the direction of ropes
90
What do the sheaves in a traveling block do?
Create the mechanical advantage
91
When do you include the lead line in a mechanical advantage?
When the lead line is being pulled upward from the traveling block.
92
What does the machanical advantage 7:1 mean?
That every 7 feet of line you pull, the hook rises one foot.
93
What is Reeving?
The process of threading the rope through the sheaves in a block-and-tackle system.
94
When the set of blocks has an equal number of sheaves, you must fasten the dead end of the rope to the ______.
Stationary block becket
95
When the set of blocks has an unequal number of sheaves, you must fasten the dead end of the rope to ____
becket on the block with least sheaves.
96
When the set of blocks has more than two sheaves, lead line should come from _______.
The sheave closest to the centre
97
The fixed block’s connection point should always be stronger then______.
The hook on the travelling block
98
What ropes do you use tackle blocks with?
Natural and synthetic fibre ropes.
99
How do you decide how to wind a rope on a spool?
Depends on the lay direction and
If the rope leads from the bottom or top.
100
How do you wind left lay leading from the top?
Start at the right
101
How do you wind left lay leading from the bottom
Left flange
102
How do you wind right lay rope leading from the underside?
Right flange
103
How do you wind right lay leading from the top?
Left flange
104
Answer.
B)
105
Answer.
B)
106
What kind of wire rope LNS can be cut without seizing?
Preformed Wire Ropes
107
What is the orientation of a Right Lay Regular Lay.
Number of wires twisted to the LEFT around a small core to form each of six or eight strands. These strands are then twisted to the RIGHT around the main core to form the final rope.
108
What is the orientation of a Left Lay Regular Lay?
Wires are twisted to the RIGHT in the strands, and the strands are twisted to the LEFT to produce the rope.
109
What is the orientation to wires in a Lang Lay?
Wires and strands are twisted in the same direction. Core design is the same as that of a regular lay.
110
Is a kink in a wire rope permanent?
Yes
111
A proper fitting rope in a sheave groove should support the rope over _____ degrees of the ropes circumference.
135 - 150 degrees
112
What do you do to the end of a cut wire rope before removing seizing?
Braze or weld the ends.
113
How long are fibres in a fibre rope?
6 - 20 feet long
114
How are right hand lay fibre ropes constructed?
Fibres right hand twisted into yarns then yarns left hand twisted into strands and 3 - 4 strands right hand twisted to form rope.
115
What are the natural fibre rope material strengths from strongest to weakest?
Hemp, Sisal, Jute, Cotton
116
What does hard-laid rope and medium-laid rope refer to?
The verifying degrees of tightness of the twisted yarns and strands.
