Procedural Guide - Book - Page 86
5.1 IMPLEMENTATION RISK
5.1.8
The table below provides practical examples of structures that could be classified based
upon the ‘risk description’ in related to the implementation risk classification shown
in table 1.
Who can issue
the permit?
Risk
Level
VERY LOW
Example of a structure in situ
Risk
description
LOW
MEDIUM
HIGH
No identified
practical mode
of failure
No impact if
failure occurs
TWS
SC
TWC
PC
TWC
How
frequently
should the
structure
be
inspected?
Yes but may not be
required as works
can be controlled
via RAMS
After
installation
Before first
use
Intervals
not
exceeding
7-days
Yes
After
installation
Before first
use
Intervals
not
exceeding
7-days
As per ITP
(if
necessary)
Minor structures
High levels of
robustness
Very
experienced
workforce
Failure entirely
‘in site’ of low
impact
Inconvenient but
injury unlikely
Conventional
structures and
construction
methods
Relatively
experienced
workforce
Failure would be
major
potentially fatal
or significant
loss
Would not cause
a secondary
chain of events
Stability reliant
on critical
elements
Complex
interfaces where
items impact on
each other
Inexperienced
workforce
Unfamiliar
processes or
equipment
Catastrophic
failure that
might cause a
chain reaction
Version 2 © mytemporaryworks 2023 | The control of temporary works – procedural guide
No
After
installation
Before first
use
Bi-weekly
As per ITP
Yes
No
Yes
After
installation
Before first
use
Possibly
daily
As per ITP
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