Signs of the Times - December 2017 - 32
NUTS + BOLTS
BILL
DUNDAS
RIGGING FUNDAMENTALS
Safe hoisting practices shouldn't be taken for granted.
IGN installers are experienced in hooking up
various loads to their
cranes for hoisting. Yet the
routine nature of these operations,
combined with the fact that lessexperienced workers sometimes
assume these duties, can lead to
errors that compromise safety. The
substantial importance of safe rigging
in construction operations is reflected in corresponding standards
developed by the US government.
The US Department of Energy
(DOE) incorporates a Hoisting and
Rigging Technical Advisory Committee that develops these standards
and publishes the DOE Hoisting and
Rigging Standard (DOE-STD-1090)
and accompanying manual. Following its specifications can spell the
difference between project safety and
exposure to hazards.
S
SLINGS AND SHACKLES
The most common rigging devices
are slings that attach loads to the
crane hook and shackles that provide
attachment points for hoisting signs
and other items. While three basic
types of slings are widely used to
hoist loads, the most common type is
the synthetic web sling. These slings
may be composed of nylon or polyester which, when woven into thick
strands, becomes extremely strong.
Some key advantages of synthetic
slings include their light weight, softness and elasticity compared to steel
slings (e.g., chain slings or wire-rope
slings). These properties reduce the
likelihood of marring or otherwise
damaging surfaces of signs and
hardware.
Nylon slings are considered superior
because they incorporate twice the
elasticity of polyester slings. This extra
Wire-rope sling (left), Synthetic web sling (center), Chain sling (right).
32
SIGNS OF THE TIMES
DECEMBER 2017
is a sign-industry consultant and the former
manager of technical
and regulatory affairs
for the ISA. Email him at
wsdundas296@gmail.com
stretching capability provides a buffer
against sudden shocks that sometimes occur during load movements
and handling. But regardless of the
type of synthetic web sling used, the
fact that they cannot rust represents
an additional advantage.
Synthetic web slings, though, are
more susceptible to damage from
cuts, abrasions, heat, moisture and
chemicals than steel slings. Sling
manufacturers incorporate red fibers
into the cores of synthetic slings which,
when exposed due to substantial
wear or misuse, indicate that the
sling must be removed from use. For
all usable slings, it's essential to use
dry-storage racks - ideally located
indoors. All slings require regular
inspections to ensure that they're
not damaged. Additionally, synthetic
slings should never be knotted during
use, as tests show this can reduce the
Table of Contents for the Digital Edition of Signs of the Times - December 2017
Signs of the Times - December 2017
Contents
From the Editor
St Update
At Large
Tech Review
Vehicles + Vinyl
Design Matters
Nuts + Bolts
An Overarching Theme
The Value of Signs
Going With the Flow
Design Software
New Products
Advertising Index
Last Look
Signs of the Times - December 2017 - Intro
Signs of the Times - December 2017 - BB1
Signs of the Times - December 2017 - BB2
Signs of the Times - December 2017 - Signs of the Times - December 2017
Signs of the Times - December 2017 - BD_L
Signs of the Times - December 2017 - BD
Signs of the Times - December 2017 - Cover2
Signs of the Times - December 2017 - 1
Signs of the Times - December 2017 - 2
Signs of the Times - December 2017 - 3
Signs of the Times - December 2017 - Contents
Signs of the Times - December 2017 - 5
Signs of the Times - December 2017 - 6
Signs of the Times - December 2017 - 7
Signs of the Times - December 2017 - 8
Signs of the Times - December 2017 - 9
Signs of the Times - December 2017 - From the Editor
Signs of the Times - December 2017 - 11
Signs of the Times - December 2017 - St Update
Signs of the Times - December 2017 - 13
Signs of the Times - December 2017 - 14
Signs of the Times - December 2017 - 15
Signs of the Times - December 2017 - 16
Signs of the Times - December 2017 - 17
Signs of the Times - December 2017 - 18
Signs of the Times - December 2017 - 19
Signs of the Times - December 2017 - At Large
Signs of the Times - December 2017 - 21
Signs of the Times - December 2017 - 22
Signs of the Times - December 2017 - 23
Signs of the Times - December 2017 - Tech Review
Signs of the Times - December 2017 - 25
Signs of the Times - December 2017 - Vehicles + Vinyl
Signs of the Times - December 2017 - 27
Signs of the Times - December 2017 - 28
Signs of the Times - December 2017 - 29
Signs of the Times - December 2017 - Design Matters
Signs of the Times - December 2017 - 31
Signs of the Times - December 2017 - Nuts + Bolts
Signs of the Times - December 2017 - 33
Signs of the Times - December 2017 - 34
Signs of the Times - December 2017 - 35
Signs of the Times - December 2017 - 36
Signs of the Times - December 2017 - 37
Signs of the Times - December 2017 - An Overarching Theme
Signs of the Times - December 2017 - 39
Signs of the Times - December 2017 - 40
Signs of the Times - December 2017 - 41
Signs of the Times - December 2017 - The Value of Signs
Signs of the Times - December 2017 - 43
Signs of the Times - December 2017 - 44
Signs of the Times - December 2017 - 45
Signs of the Times - December 2017 - Going With the Flow
Signs of the Times - December 2017 - 47
Signs of the Times - December 2017 - Design Software
Signs of the Times - December 2017 - 49
Signs of the Times - December 2017 - 50
Signs of the Times - December 2017 - 51
Signs of the Times - December 2017 - New Products
Signs of the Times - December 2017 - 53
Signs of the Times - December 2017 - 54
Signs of the Times - December 2017 - 55
Signs of the Times - December 2017 - 56
Signs of the Times - December 2017 - 57
Signs of the Times - December 2017 - 58
Signs of the Times - December 2017 - 59
Signs of the Times - December 2017 - 60
Signs of the Times - December 2017 - 61
Signs of the Times - December 2017 - 62
Signs of the Times - December 2017 - 63
Signs of the Times - December 2017 - 64
Signs of the Times - December 2017 - 65
Signs of the Times - December 2017 - 66
Signs of the Times - December 2017 - 67
Signs of the Times - December 2017 - 68
Signs of the Times - December 2017 - 69
Signs of the Times - December 2017 - 70
Signs of the Times - December 2017 - 71
Signs of the Times - December 2017 - 72
Signs of the Times - December 2017 - 73
Signs of the Times - December 2017 - 74
Signs of the Times - December 2017 - 75
Signs of the Times - December 2017 - 76
Signs of the Times - December 2017 - 77
Signs of the Times - December 2017 - 78
Signs of the Times - December 2017 - Advertising Index
Signs of the Times - December 2017 - Last Look
Signs of the Times - December 2017 - Cover3
Signs of the Times - December 2017 - Cover4
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