Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Rigging > Jan 7th > Flashcards

Jan 7th Flashcards

1
Q

What are the two most common types of shackles ?

A
  1. Screw pin anchor shackle

2. Screw pin chain shackle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How much does the percentage of capacity decrease when rigging is at a 45 degree angle ?

A

30 %

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How much does the percentage of capacity on a shackle decrease when rigging is at a 90 degree angle ?

A

50%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Shackles should be tightened by hand so the full threads are engaged.
True or false

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How often do shackles 80t and above need to be mag particle tested?

A

Every year

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is another term for a lifting lug?

A

Pad-eye

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the two forces placed on a spreader bar under load?

A
  1. Compression

2. Bending

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How are shackles sized ?

A

By the diameter of the bow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How is WLL determined on a turn buckle ?

A

By the outside diameter of threaded portion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

When is the only time you may use a jam not on a turnbuckle ?

A

When the turnbuckle comes equipped with one from OEM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Name the five styles of turnbuckles

A
  1. Eye and eye
  2. Jaw and eye
  3. Jaw and jaw
  4. Hook and eye
  5. Hook and hook
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Define a come along

A

A hand operated winch with a ratchet used to pull objects

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When would you use a snatch block in an overhead lift ?

A

Never. They are used to change the pulling direction of wire rope.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Name two differences between crane blocks and wire rope blocks.

A
  1. Crane blocks have cheek weights while wire rope blocks utilize cheek straps
  2. Crane blocks are designed for heavy objects and frequent lifting while the lighter wire rope blocks are designed for high speed applications
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the most important factor of a overhead ball?

A

Being heavy enough to keep the line tight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the one style of hook exempt from the rule that they must all be equipped with a swivel and safety latch ?

A

Sorting/pelican hook

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Name the three styles of eye bolts.

A
  1. Regular nut type
  2. Shoulder nut type
  3. Machinery type
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Which style of eye bolt may be loaded at an angle (permitting it is placed in plane of the eye and capacity is reduced accordingly) ?

A

Shoulder nut type

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

How much of the exposed area on a shackle pin should be covered by the lug during a lift ?

A

80%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is the difference between a spreader bar and an equalizer bar ?

A

Spreader bars have two lugs on each end and each side whereas an equalizer bar has one on one side and two on the other. (Can be flipped)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is the safety factor for running lines (iwrc)

A

3.5 to 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is the safety factor for running lines (rotation resistant)

A

5:1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is the safety factor for rigging and slings

A

5:1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the safety factor when hoisting personnel

A

10:1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What is the safety factor for chain slings

A

4:1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

For supporting the boom, working attachments and rated loads (including boom suspensions) the design factor for boom pendants or standing ropes shall not be less than what

A

3:1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

For supporting the boom under recommended boom erection conditions the design factor for boom pendants or standing ropes shall. It be less than what

A

2.5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

How do you determine breaking strength for IWRC

A

D^2 x 45

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

What is the formula to determine breaking strength for fibre core wire rope

A

D^2 x 42

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

If the core of a wire rope was unknown how would you determine its breaking strength as a rule of thumb

A

D^2 x 8

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

What is the rule of thumb to determine the breaking strength of chain

A

D^2 x6

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

What is the formula for determining safe working load on an iwrc

A

D^2 x 45 / 5

Answer will be in tons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

What is the formula for determining the safe working load on a fibre core wire rope

A

D^2 x 42 / 5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

What is the formula for determining the safe working load of galvanized wire rope

A

D^2 x 40 / 10

35
Q

What is the formula to determine the capacity of a basket hitch (true)

A

Svc x2

36
Q

What is the formula to determine the capacity of a choker hitch

A

Svc x .75

37
Q

How would you determine how many wire rope clips are needed

A

D x 3 + 1 (to the next whole number)

38
Q

How would you determine clip spacing

A

D x 6 ( centre to centre)

39
Q

What is replacement criteria on running ropes ?

A

6 or more broken wires in one lay length or

3 or more broken wires within a strand in one lay length

40
Q

What is the replacement criteria for standing ropes

A

More than one broken wire going into an end fitting or
3 or more broken wires in one lay length or
2 broken wires in 6 rope diameters or 4 broken wires in 30 diameters

41
Q

Do hooks have any tolerance for twists or spreading outside of the normal original opening

A

No. Rigging shall be used within the 45 degree hash lines and no more than two slings at a time shall be used

42
Q

At what percentage of wear on the pin or bow shall a shackle be removed from service

A

10% or over

43
Q

How efficient are chain falls (%)

A

85 % effective

15 % loss to friction

44
Q

What is reduced capacity of a hook if the load is 1/4 off centre

A

Approx 86 %

45
Q

What is the reduced capacity of a hook if a load is 1/2 of centre

A

Approx 80%

46
Q

What is the reduced capacity of a hook if the load is 3/4 off centre

A

Approx 70%

47
Q

If you point load a hook how much is its capacity reduced by

A

60%

48
Q

With the exception of pelican/sorting hooks. What must all load hooks be equipped with

A

A swivel and a safety latch
The latch shall bridge the throat opening of the hook for the purpose of retaining slings or other devices under slack conditions

49
Q

What is the most flexible wire rope

A

6x37

50
Q

What is the most common type of wire rope

A

Right regular lay

51
Q

What material has the greatest resistance to shock loading

A

Nylon

52
Q

No matter how many legs of a chain sling are used the rating of only ______ shall be used

A

2

53
Q

What is the stitching called that goes end to end on a sling

A

Warp

54
Q

What is the stitching called that goes across a sling

A

Weft

55
Q

What are the characteristics/components of wire rope

A

Wire rope is comprised of steel wires which are laid and twisted together to form strands, the strands are the laid around a core.
Steel wires
Strands
Core

56
Q

What is a wire core made of and what are its advantages

A

It is just another strand
It adds about 7.5 % strength over fibre core
Helps resist rope crushing
Required in extremely hot work environment as fibre core could burn or char

57
Q

What are the five basic design principles of wire rope

A

Grade of wire - ips, eips/xips , eeips/xxips etc

Number and pattern of wires used in a strand and the number of strands ex 6x19 means 6 strands with 19 wires per strand

Lay type - regular or Lang lay

Pre forming - resists crushing and helps hold shape when cut also resists unwinding and each strand carries and equal load

Type of core - wire of fibre

58
Q

Describe the characteristics as benefits of fibre core wire rope

A

It is lighter and adds flexibility which allows greater resistance to shock loading. During manufacturing the fibre core is impregnated with lubricant, which is released during rope use and helps keep the wires lubricated. It also helps cushion strands during use

59
Q

What is an example of a synthetic rope starting to see use

A

Kz-100 rope by Samson

60
Q

What is plasma rope

A

Synthetic rope manufactured using polyethylene

61
Q

Wire rope is manufactured in what five grades

A

Grade 90/100 mild plow
-has high fatigue resistance but lower tensile strength (applications are limited
Grade 100/110
-has lower tensile strength but can be used when strength is secondary to wear resistance
Grade 110/120 IPS
- most common has good wear resistance high fatigue factor and high tensile strength
Grade 115/125 EIPS
- used when the need for higher breaking strength is required the bending quality is not as good as IPS but it’s about 15% stronger
Grade 120/130 EEIPS
- is used when special installations require max rope strength such as mine shaft hoisting about 10% stronger than EIPS

62
Q

What are three less common types of specialized wire rope

A

Corrosion resistant - for military applications

Galvanized finish - for more durability

Phosphor/ bronze/ copper - for corrosion resistance as well as non sparking used in hazardous industrial plants and marine applications

63
Q

Wire ropes are also characterized by their strand shape. List four and identify the most common

A

Round strand - most common
Flattened strand
Locked coil ropes
Concentric strand ropes

64
Q

What is the rule of thumb pertaining to bending fatigue

A

The greater the number of wires in a strand the greater the resistance to rope bending fatigue

65
Q

Within round strand classifications the wires may be arranged In certain geometric patterns called constructions. List the four most common and their characteristics

A

Ordinary - all wires are the same

Seale - larger diameter wires are used on the outside of the strand to resist abrasion and smaller wires are inside to provide flexibility

Warrington - alternating wires are large and small to combine great flexibility with resistance to abrasion

Filler - very small wires fill in the valleys between the outer and inner rows of wires to provide good abrasion and fatigue resistance

66
Q

How would you spool new wire rope onto the drum

A

In the same direction it is on the cable spool
Ex top to top
Bottom to bottom

67
Q

Do fittings and connections reduce cables efficiency

A

Yes

68
Q

When using a wedge socket what is the efficiency reduced to

A

70% AIT

80-85 % real world

69
Q

Rope should be supported by a sheave over an arc of what

A

120 to 150 degrees

70
Q

Since 2001 it has been mandatory for all slings to to have an ID tag with what five things on it

A 
Name/trademark of the manufacturer 
Diameter or size 
Type of material used 
Rated load for a given hitch 
Lift angle upon which the load rating is based
71
Q

What is the most common method of making an eye or attaching a piece of wire rope to equipment.

A

With cable clips

72
Q

What are the two main types of cable clips

A

U bolt

Fist grip

73
Q

What are the three parts or a U bolt

A

A U shaped bolt
A forged saddle
Two nuts

74
Q

Cable clips are capable of producing up to _____ % or wire rope strength when properly applied and can drop to _____ % if incorrectly installed

A

80

40

75
Q

What are the advantages of a fist grip clip

A

Offers a wider bearing surface for maximum strength and greater holding power

76
Q

When should you tighten your clips.

A

Before tension is applied, making sure to come back and check for tension after a load has been applied

77
Q

Can you connect two straight wire rope lengths with cable clips

A

No. If necessary create two eyes and connect the eyes

78
Q

What do you need to always use to form an eye on wire rope

A

A thimble

79
Q

Can you reuse cable clips

A

No. You will never achieve proper efficiency after use

80
Q

What is the most popular natural fibre rope/the only one used in the construction industry and what are its characteristics

A

Number one grade Manilla rope
- strong
- durable
- light yellow colour
- as grade and strength decrease the colour darkens
The breaking strength of 1” dia manilla rope is 9000 pounds

81
Q

What are four other types of natural fibre ropes and there characteristics

A

Hemp - strongest of natural fibres
- deteriorates quickly when wet

Sisal - approx 75% strength of untarred hemp
- stands exposure to seawater

Coir - made from coconut husk fibres

  • very elastic
  • 1/4 the strength of hemp
  • floats

Cotton - 60% as strong as hemp

82
Q

Besides having individual threads and fibres that run continuously through the rope what other characteristics do synthetic fibre ropes share

A

Resistance to rot and mildew

More strength than natural fibre rope

83
Q

What are the four common types of synthetic wire ropes and their characteristics and which is the most popular/common

A

Nylon -other than kevlar it’s the strongest

Polyester -not as strong as nylon twice as strong as Manila

Polypropylene - lightest, most economical and most popular

Polyethylene - 50% as strong as nylon and resists acids and alkalis

Rigging (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions