Tony Parasram (Free4m)
GN 22Asset-management Toolkit
Minor Structures (AToMS)
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− TR22 is now with drawn
− Use for past historical reference
− Why the change
− Align to the new Highway Code of practice
− Applicable to a broader asset owner base
− Good asset management practice
− DMRB columns are minor structures
− Need to consider as such
− Align to good structures practices
Why GN22?
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− The ‘new’ Code of Practice
− A review and consolidation of current codes
− Highways
− Structures
− Lighting
− To reflect current good practice
− In force October 2018
Code of Practice
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− Risk & asset management based
− Reactive
− Time based
− Condition based
− Challenges
− Evidence of process
− Evidence of why this process is considered suitable?
− Skills and competencies
Code of Practice
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− Understanding the asset
− Focus on risk and resilience
− If you don’t know what you have you can’t manage it
− What is needed
− Evidence of process
− Skills and competencies
− Tailored service to suit local needs / requirements
− Business case for service delivery
Code of Practice
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− HSE Guidance
− Selection of the minimum broadly acceptable failure rate to determine the ARL
− As Low As Reasonably Possible or ALARP
What Is The Risk Based Approach?
Network Rail
Rural area
Where am I on this scale?
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− Why the change – well essentially the new CoP
− I have a long term contract so does it apply (or
words similar to this) – yes the CoP has changed,
contracts allow for change control etc.
− Can I carry on using TR22 – no it is withdrawn, the
new CoP requires a different approach based upon
asset management and risk assessment, if you
don’t follow the CoP and then GN22 you will need
to evidence why not and that your approach is
equivalent.
FAQ
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− Structured cost effective inspection & testing
− Visual inspections based on defect rating:
− A to E for extent
− 1 to 5 for severity
− Downloadable condition software for free
− Software calculates stock Condition Index
− Condition Index related to other Asset Managed disciplines:
− Excellent/Good/Fair/Poor
− National Condition Indicator
GN22/TR22 – Compare
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− CCI
• A condition index to determine the overall condition
of the lighting stock and track deterioration
• Use as a means for monitoring whether adequate
steps are being taken to manage the stock in line
with the desired strategy
• Structural elements (shaft, bracket, base plate …)
− Adopted by UK Lighting Board as a future indicator
Column Condition Index (CCI)
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− Each element assessed
− Element Condition Score (ECS)
A – E for extent
1 – 5 for severity
ie A1 to E5
− Results fed into model
− Element Condition Factor (ECF) – takes account
of influence on overall condition
GN22 Visual Assessment
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− Severity codes
− 1 to 5
− Extent codes
− A to E
Assessment codes
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− Inspection and testing remain unchanged
− Only reporting is modified
− Training available for inspectors
Inspection recording
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Convert your existing inspection data
CONVERT
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GN22 – What Does The CCI Index Mean?
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Dashboard
CCIave CCIcrit
% of stock with
inspection dates
logged against
each asset
% of completed
fields of data
for each asset with
inspection dates
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Ward / district report
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Street level report
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− Column materials
− Aluminium
− Timber
− Concrete
− Steel
− Assumed Residual Life (ARL) model considers
steel
Considers structure material
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Considers protective coating
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Considers environmental factors
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Approach for a deteriorating column
Assumed residual life
Age (Years)
Applied Moments
Colu
mn
Mom
ent r
esis
tanc
e
Current age
Corrosion initiation period
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What Do I Get Out Of It? CCI
View by area
Results broken down
Free toolkit software
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What Do I Get Out Of It? ARL
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2017 NDT test houses report an average of 3.5% are
red/critical columns
They report a growing number of amber assessed
columns
(2010-11% to 2016-37%)
10% of amber columns have turned red over 3 years
PFI’s have been replacing cc 80% of their authorities
stock over a five year investment period
Understanding your asset has never been so important
Where we are nationally
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− A new asset management approach
− Structured cost effective inspection & testing
− Model to determine the residual life
− Risk based criteria
− Identify risk
− Analyse the risk
− Evaluate the risk
− Risk treatment
− Monitor and review
In Summary
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Thank You