BS 5975 2019 Extract - Flipbook - Page 36
BS 5975:2019
BRITISH STANDARD
Table 1 4 Implementation risk classes for temporary works and examples of mitigation measures
Permits required
Implementation
risk class
Risk
Very low
" No identified practical mode of N/A
failure.
" No impact if failure occurs.
Low
" Minor structures with high
levels of robustness.
" Very experienced workforce.
Other control
measures
Control via RAMS.
Inspection by site
team, not necessarily
recorded on the
temporary works
register and might not
require a design brief.
Permits can be signed
by a TWC or an
authorized TWS.
Follow company
procedures, including
inspection and test plan
(see Clause 14).
Permits can be signed
by the PC9s TWC or an
authorized TWC.
Follow company
procedures, including
inspection and test plan
(see Clause 14).
Permits signed by PC9s
TWC.
Follow company
procedures, including
inspection and test plan
(see Clause 14).
" Failure is entirely within the
site, of low impact. Inconvenient,
but personal injury unlikely.
Medium
" Conventional structures.
Conventional construction
methods.
" Relatively experienced
workforce.
" Failure would be major,
potentially involving injury,
fatality or significant economic
loss. Would not initiate secondary
events.
High
" Schemes with dependency
on critical structural details,
with little or no redundancy, or
with stability reliant on critical
elements.
" Schemes with complex
interfaces where various items of
temporary works impact on one
another
PC9s DI to ensure the
scheme is reviewed, e.g.
HAZOP or peer review.
" Inexperienced workforce.
" Unfamiliar processes or
equipment.
" Failure would be catastrophic
in its own right, or if minor might
initiate a secondary or chain
reaction of major or catastrophic
events.
NOTE 1 The TWC's and TWS's scope of work is covered in 11.2.2, 11.3.2 and 12.2 respectively.
NOTE 2 The PC's TWC agrees the signatory for each permit applicable to the item of temporary works.
NOTE 3 It is outside the scope of this British Standard to classify particular temporary works.
28#© THE BRITISH STANDARDS INSTITUTION 2019 3 ALL RIGHTS RESERVED
