Pipeline Condition Assessment - Trenchless Asia
Transcript of Pipeline Condition Assessment - Trenchless Asia
5/16/2018
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TRENCHLESS ASIA 2018
Pipeline Condition Assessment
Peter Henley WRc Infrastructure
7-8 May 2018
Organised by Platinum SponsorsEvent Partner
wrc-infrastructure.co.ukwrc-infrastructure.co.uk
What’s going on down there? Condition Assessment Investment
Strategy
Cost of Cost of Cost of Cost of
InspectionInspectionInspectionInspection
Capital CommitmentCapital CommitmentCapital CommitmentCapital Commitment
Capital EfficiencyCapital EfficiencyCapital EfficiencyCapital Efficiency
Lower ResolutionLower ResolutionLower ResolutionLower Resolution
High ResolutionHigh ResolutionHigh ResolutionHigh Resolution
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External - NDT Inspection
• Traditional methods
• Exposing the pipe and
measuring the remaining
pipe wall thickness
• Typical techniques used are
ultrasonics and electro
magnetics
• Limited to a snapshot of the
pipe at that location
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• Small and medium leaks are hard to find with external tools
• Inline technologies bring the sensor to the leak
• Both type of inspection can offer Pipe Wall Assessment (PWA) in
live mains
‘Free-
Swimming’
‘Tethered’
Internal Pipeline Inspection
Techniques
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• Acoustic sensor hears leaks
• Other sensors can be added
• Detects 0.1 Ml/d per km
Tethered Inspection - Sahara
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Acoustic Leak Detection & CCTV
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Free Swimming Inspection Systems
Pure SmartBall Aquam Bullet
Free Swimming High Resolution
Inspection
• Systems such as Pure PipeDiver & Aquam Pipescan
• Provide high resolution data on pipe condition
Detailed Pipeline Assessment Results Condition Assessment Gravity Sewers
CCTV Inspection
• CCTV Inspection CCTV Inspection CCTV Inspection CCTV Inspection ---- defect observationdefect observationdefect observationdefect observation
• Well established technique for assessing the condition of sewerWell established technique for assessing the condition of sewerWell established technique for assessing the condition of sewerWell established technique for assessing the condition of sewer
• Depends on the skill of the surveyor for accuracy Depends on the skill of the surveyor for accuracy Depends on the skill of the surveyor for accuracy Depends on the skill of the surveyor for accuracy
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Gravity Sewers - Electro Scan
• Identifies infiltration sources that CCTV doesn’t seeIdentifies infiltration sources that CCTV doesn’t seeIdentifies infiltration sources that CCTV doesn’t seeIdentifies infiltration sources that CCTV doesn’t see
• Quantifies the amount of infiltrationQuantifies the amount of infiltrationQuantifies the amount of infiltrationQuantifies the amount of infiltration
• Allowing rehabilitation to be better targetedAllowing rehabilitation to be better targetedAllowing rehabilitation to be better targetedAllowing rehabilitation to be better targeted
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Typical Electro Scan Survey Plot
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Electro Scan & CCTV Comparisons
B
A
A
B
C
Joint
C
Joint
Case Study – Southern Water
Romsey Rising Main - SmartBall Survey 1. Provided operational confidence in the technology
2. Confirmed the outputs available from the technology
3. Understand the context in which the results would form part of the capital
maintenance targeting process and decision tree - Capital Maintenance
Efficiency Strategy
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Case Study Findings
• 2.4km Ductile Iron Wastewater
• Pressure Main
• No leaks presenting
• No stationary, trapped pockets of gas
• 3 vertical blanked Ts discovered
– during planning
• Several pockets of entrained air
• No significant deviation between the recorded pipeline route and that
detected using SmartBall
Condition Assessment Results –
Suggested Actions
Leak location using in-pipe survey Leak type Suggested action
Small leak, cast/spun iron joint Stable Monitor through regular data review
Large leak, cast/spun iron joint Stable Plan in repair at time of lower reactive maintenance
Leak on cast/spun iron pipe barrel Critical Urgent repair
Small leak, ductile iron or steel UnstableFrequent monitoring through data review. Consider regular
in-pipe surveys
Large leak, ductile iron or steel Unstable Urgent repair
Multiple leaks observed in
single surveyMixed
Planned regular in-pipe inspections; determine sections
which may benefit from rehabilitation rather than repair
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Survey Decision Tree - Examples
What do we need to know? How do you find that out? What did we find out?
How much of a 15km pipeline needs
replacement?
Leak and wire break detection using untethered
inspection device on 30" pipeline
Only one pipe length requiring intervention
0.04% of total length.
The condition and location of a brick
sewer before nearby construction
project starts?
Laser/sonar profile and deep tracing Mapped position of localised damage to
brickwork and informed construction company of
exact route of 150m sewer
How much of a 2.8km 800mm steel
pipeline is corroded, and requires
intervention?
Acoustic and pipe wall loss assessment tool
required
4 pipes with corrosion spots > 60% through wall
corrosion. 2%
Is there a large diameter leak not picked
up by correlation?
Acoustic leak detection Leak located
How much of a 10km 400mm rising
main requires replacement?
Free rolling leak detection and magnetic data
inspection on a CI and AC pipeline.
The line of the main and pipe materials were
very different from GIS. A significant length of
replacement was de-scoped as the pipe was
found to be new.
Are trunk mains leaking? Upstream loss analysis followed by targeted in-
pipe leak detection
Real loss of 2MLD estimated from analysis. Leak
found and repaired. 2 MLD saved.
Survey Decision Tree - Examples
What do we need to know? How do you find that out? What did we find out?
Which damaged sewer pipes are causing a
waste water pumping station to be
overwhelmed?
Electro Scan of 600m section 63 infiltrations but 80% of infiltration restricted to just 3
sections 3%
How to minimise excavation locating and
repairing 10m deep suspected leak?
Sahara deep location and acoustic
detection
5 M/ld leak location pinpointed.
What is the route cause of corrosion and
high number of historic bursts, and likely
locations requiring intervention?
Acoustic and conductivity survey
on 300m 250mm main
Gas pockets identified and new gas relief valves installed as
well as providing new information on the route and material
of the main.
To what extent are dead zebra mussels
affecting treatment works?
Sonar profile scan using Sahara The location and quantification of mussels enabled planned
maintenance
Can we increase pressure on the pipeline? 6km Untethered acoustic survey Leaks found at one previous repair and 2 scour points, the
rest of the pipeline has not leaked in 40 years so pressure
was successfully increased.
The extent to which joints are leaking on a
1500mm PCCP pipeline?
Untethered 6km acoustic survey “The survey was an extremely worthwhile exercise that has
identified an unexpected leak. Critical trunk mains should be
subject to such inspections routinely to reduce risk to supply
and allow for the repair of pipes in a planned manner.” –
John Slattery (Senior Executive Engineer)
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PETER HENLEY – WRC INFRASTRUCTURE
Thank you for your attention
See me on JBP Stand 119 for further information