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Construction safety > official study guide Rigging > Flashcards

official study guide Rigging Flashcards

1
Q

CFR 1926.251 Subpart H

A

rigging equipment

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2
Q

Between the trolley hook and the load is ___.

A

rigging

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3
Q

What are some examples of rigging?

A
  1. Chains
  2. Wire rope
  3. Natural rope
  4. Synthetic webbing
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4
Q

1926.251 General

A
  1. Rigging inspected prior to shift(s)
  2. As necessary during use
  3. Removed if defective
  4. Remove rigging equipment when not in use
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5
Q

1926.251 Scope

A
  1. Covers slings and hoisting material handling equipment
  2. Alloy steel chain,
  3. Wire rope,
  4. Metal mesh,
  5. Natural or synthetic fiber rope (conventional three strand construction), and
  6. Synthetic web (nylon, polyester, and polypropylene).
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6
Q

1926.251(a)

A

Rigging equipment for material handling. Synthetic fiber, metal mesh, wire rope, alloyed steel.

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7
Q

◦ Grade 28

A

General Utility Chain

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8
Q

◦ Grade 43

A

High Test Chain

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9
Q

◦ Grade 70

A

Binding Chain

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10
Q

◦ Grade 80 Alloy Steel Chain:

A

The only one used for

overhead lifting!

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11
Q

Check for wear, gouges, stretch, ____. 

A

shearing

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12
Q

Chain inspection is ___.

A

LINK by LINK

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13
Q

____ link extremely unsafe. Use with grab hooks.

A

Twisted

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14
Q

Tags: should be on every chain:

A

Size, Grade,

Capacity

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15
Q

1926.251(b)

A

Alloy Steel Chain

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16
Q

When using wire ropes, Follow manufacturers_____ recommendations,or Tables H - 3 through H - 14

A

safe

working load

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17
Q

When using wire ropes no __ in wire
rope except where
permitted in (c)(3) &
(c)(4)(ii)

A

knots

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18
Q

A typical wire rope may be
designated __ FW PRF
RLL XIP IWRC.

A

6X25

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19
Q

What does this mean? 6X25 FW PRF RLL XIP IWRC

A

A 6 strand (6X25) of filler wire construction (FW).The grade of wire used is
Extra Improved Plow Steel
(XIP). The strands are preformed (PRF) in helical pattern before being laid Right Lang (RLL) around an Independent Wire Rope Core (IWRC).

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20
Q

1926.251(c) Wire Rope

A

End strands covered or blunted

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21
Q

What are the four types of slings?

A
  • Choker
  • Basket
  • Straight
  • Bridle
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22
Q

When using a mechanical splice, what is illegal?

A

A pigtail!!!

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23
Q

1926.251(c) Wire Rope

A

Wire rope shall not be used if, in any length of eight diameters, the total number of visible broken wires exceeds 10 percent of the total number of wires, or if the rope shows other signs of excessive wear,corrosion, or defect.

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24
Q

When using a Hand Tucked Eye Splice ___ is illegal.

A

blunted strands

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25
Q 
When using wire ropes U-bolt applied so
that the "U"
section is in
contact with the \_\_\_of the
rope.
A

dead end

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26
Q

When dealing with wire ropes use Table H - 20
to determine
number and ___
of clips.

A

spacing

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27
Q

When dealing with wire ropes, never ____
slings with knots or
bolts.

A

shorten

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28
Q

When using wire ropes, protect slings from

_____.

A

sharp edges

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29
Q

When using wire ropes never apply a ____ when
lifting.

A

shock load

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30
Q

When using wire rope never place __
between sling &
load when
tightening

A

finger

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31
Q

1926.251(d)

A

Natural & Synthetic Rope

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32
Q

When using natural nd synthetic ropes, what tables apply?

A

Tables H - 15 through H - 18 apply

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33
Q

When using natural and synthetic topes,___used instead of splices

A

knots

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34
Q

1926.251(e)

A

Synthetic Webbing

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35
Q

(nylon,
polyester, and
polypropylene).

A

Synthetic

webbing

36
Q

(1)Each synthetic web
sling marked or coded to
show:

A 
◦ (i) Name or trademark of
manufacturer.
◦ (ii) Rated capacities for
the type of hitch.
◦ (iii) Type of material.
37
Q

1926.251(e) Synthetic Webbing should not be used ____.

A

Don’t use around

acids or phenolics.

38
Q

1926.251 (f)

A

Shackles and hooks.

39
Q

What table is shackles and hooks?

A

H-19

40
Q

How should you test shackles and hooks?

A

Tested to twice the intended safe working
load before they are initially put into use.
Maintain a record of the dates and results
of such tests.

41
Q

___ are used for lifting,
towing, pulling and
securing.

A

Hooks

42
Q

Two general classifications for hooks:

A

sling hooks, Grab hooks

43
Q

to which load
or force is applied to the
base (bowl saddle)

A

Sling Hooks:

44
Q 
contain a
throat or slot of uniform
width for securing on the
link of a chain, usually to
form a chain loop for
securing the load
A

◦ Grab Hooks:

45
Q

When using hooks do not exceed the working ___.

A

load limit

46
Q

Only use alloy heat treated hooks for____.

A

over-head lifting

47
Q

Do not or use the hook in any manner for which it was not intended.

A

tip load

48
Q

When using hooks do not shock load or ___.

A

dynamic load

49
Q

Never apply load to ___, latches are only to retain slack chains and slings

A

hook latches

50
Q

Hook inspections

A

Wear
Deformation
Cracks
Sharp Nicks

51
Q

Only___are designed for tip loading.

A

foundry hooks

52
Q

Balanced

A

100%

53
Q

1/4 off center

A

86%

54
Q

Point loading

A

40%

55
Q

1/2 off center

A

80%

56
Q

3/4 off center

A

70%

57
Q

When using hooks avoid:

A

•Side load •Back load •Tip load

58
Q

What is the max twist for a hook?

A

10 degrees

59
Q

 Hoist load chains do
not stretch __.

A

(they wear)

60
Q

Sling chains chain stretch ___.

A

10 - 15 %

61
Q

Grades are indicated ____.

A

on side of link

62
Q

Whenever wear at any point of any chain link exceeds that shown in Table H-2, the assembly shall be removed
from service.

A

1926.251(b)(5)

63
Q

when dealing with chains ___ can reduce

link cross-section.

A

Corrosion

64
Q

Link by link inspection is
facilitated by ____ the
chain.

A

collapsing

65
Q

Wear occurs in areas of

high rubbing, what are these two areas?

A
  1. The bearing points of
    interlink contact.
  2. Outside of straight
    side barrels.
66
Q 
The load on quadruple
branch slings seldom have
the load evenly distributed
among the four branches.
For this reason \_\_\_\_\_\_\_\_ set the load limit for
quad branch slings to the
equivalent rating for a
triple branch sling of the
same type.
A

sling charts for quad branch

slings

67
Q

Ropes and chains shall be regularly _____.

A

lubricated

68
Q

Wire rope wear is based on:

A
  1. Loading
  2. Bending (# of times)
  3. # of use cycles
69
Q

Change in rope diameter is criteria for ___.

A

retirement.

70
Q

The area in a wire rope to check wear is where it travels over the___ in
the section from picking a load to lifting it.

A

block

71
Q

Wire tends to wear flat on outer

strands, especially where it travels _____.

A

over drums & sheaves.

72
Q

Check for wear in clevis:

A

In the bowl of the saddle

73
Q

•Check the pin for:

A
  • Straightness

* Wear

74
Q

Check for distortion in the:

A

•Open end of the ‘U’

75
Q
  • Spreader beams can be used with a ____ to handle long loads.
  • Reduces load tipping
  • Each leg will carry one-half the total load
A

double vertical hitch

76
Q

•Spreader beams must be manufactured for that purpose and have a ____ indicated.

A

rated capacity

77
Q

 A load is stable when:

A

◦ The hook is directly above the center of

gravity of the load

78
Q

Estimate the center of gravity:

A
  1. Lift the load just enough to clear the
    ground
  2. If the hook is not over the center of gravity
    the hook will travel to the center of gravity
79
Q

If the load tips more than ___ , the rigging should be adjusted.

A

3°

80
Q

The longer the ____ , the more stable the load will be.

A

sling legs

81
Q

Four grades of chains:

A
  1. Grade 28-General utility chain
  2. Grade 43-high test chain
  3. Grade 70-Binding chain
  4. Grade 80-Alloy Steel chain
82
Q

Alloyed steel chain rules: CP Inspections made and based on.

A
  1. Frequency of sling use
  2. Severity of service conditions
  3. Nature of lifts being made
  4. Experience gained on the service life of slings used in similar circumstances.
83
Q

Six Wire rope rules:

A
  1. U-bolt applied so that the “U” section is in contact with the dead end of rope.
  2. Use table H-20 to determine number and spacing of clips.
  3. Never shorten slings with knots or bolts
  4. Protect slings from sharp edges
  5. Never apply a shock load when lifting
  6. Never place finger between sling and load when tightening.
84
Q

Removed natural synthetic rope from service if:

A
  1. Abnormal wear
  2. Powdered fiber between strands
  3. Broken or cut fibers
  4. Discolored or rotting
85
Q

remove synthetic webbing from service if:

A
  1. Acid or caustic burns
  2. Melting or charring of any part of the sling surface
  3. Snags, punctures, tears or cuts;
  4. Broken or worn stitches
  5. distortion of fittings.
86
Q

Rules for Rigging Safety

A
  1. Know the weight of the load
  2. Know the center of gravity of the load.
  3. Make load attachment above the center of gravity of the load.
  4. Select hitch that will hold and control.
  5. Know the rated capacity of slings and hardware.
  6. Select sling best suited for load.
  7. Inspect all rigging before the lift.
  8. Protect sling from sharp surfaces.
  9. Proper calculation of increased tension caused by sling angles (on all rigging components!).
  10. Calculate reductions when using choker hitch.
  11. Keep personnel clear from lift area.
  12. Lift load a few inches then check rigging.
  13. Know limitations of all lifting devices used.
  14. Lift slowly and stop slowly.
87
Q

Hook/Load Angles

A 
A. Balanced 100% 
B. 1/4 off center 86% 
C. 1/2 off center 80% 
D. 3/4 off center 70%
 E. Point loading 40%

Construction safety (24 decks)

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