Non‑Destructive Testing (NDT) Pipelines
At Tunnel Vision Surveys, we deliver advanced Non-Destructive Testing for pressurised and gravity pipelines to assess structural integrity, detect deterioration and inform long-term network strategies. Our approach provides reliable condition insight without excavation or shutdowns, helping operators maintain service, manage risk and target investment where it has the greatest impact. By combining complementary techniques, we build a defensible picture of pipeline health that engineers can trust.
What this means for you: safer networks, fewer surprises and clearer decisions based on measurable evidence:
- Preserve infrastructure integrity – robust assessment without damaging the pipeline
- Minimise operational downtime – most inspections completed live or during short possessions
- Detect cracks, corrosion, voids and defects early – intervene before issues escalate
- Demonstrate compliance – auditable outputs aligned to safety and regulatory expectations
- Plan maintenance with confidence – prioritised, risk-led actions backed by quantified data
Techniques We Use
Every network is different. We select and sequence techniques to suit material, diameter, flow conditions, access and the questions you need answered. Where it improves certainty, we deploy more than one method and correlate results.
- Ultrasonic Thickness Testing (UT) – Spot/grid measurements or full corrosion mapping to quantify wall loss, pitting and laminations with millimetre-level precision.
- Magnetic Flux Leakage (MFL) – High-sensitivity screening for surface-breaking and near-surface defects in ferrous pipelines; effective for long runs and rapid coverage.
- Visual & CCTV Inspection – High-definition imagery for internal condition, joint performance, intrusions, deposits and construction features; supports defect grading.
- Specialist Sensors for Non-Metallics – Techniques adapted for plastics and composites (e.g., guided wave, EMAT or acoustic approaches where applicable).
- Supporting Survey Controls – Location referencing, chainage, datum control and pipeline tagging to ensure findings are repeatable and traceable across programmes.
Our Inspection Process
Our workflow balances safety, accuracy and programme pressures, delivering clear, actionable outputs:
- Consultation – Define objectives, constraints and success criteria; review records and previous inspections.
- Planning – Select methods, access points and isolation requirements; produce RAMS, permits and control strategy.
- Testing – Deploy calibrated equipment and qualified technicians to capture accurate, repeatable data with minimal disruption.
- Analysis – Correlate datasets, grade defects, quantify wall loss and assess remaining life where possible; highlight immediate risks.
- Reporting – Deliver concise reports with annotated imagery, defect locations, severity ratings and prioritised recommendations, plus raw data for your systems.
Typical Applications
From early feasibility and pre-works baselining through to condition verification and life-extension, NDT supports a wide range of pipeline scenarios:
- Water and wastewater networks — trunk mains, rising mains, siphons, culverts and force mains
- Industrial and process lines — chemical, slurry, cooling and fire-main systems
- Sea outfalls and aqueducts — marine, estuarine and remote corridors with limited access
- High-consequence services — strategic mains and critical utilities where failure is unacceptable
FAQs
Frequently Asked Question
How is pipeline NDT different from a CCTV inspection?
NDT provides quantified measurements (e.g., wall thickness/corrosion mapping), while CCTV is primarily visual. We combine both where it improves certainty.
Which pipeline materials can you assess?
Ferrous pipelines (steel, cast, ductile) and reinforced concrete, plus non-metallics such as plastics/GRP/composites using adapted techniques.
Do you need shutdowns?
Usually no. Most inspections are completed live or in short possessions, planned to minimise downtime and risk.
Can you test pressurised as well as gravity pipelines?
Yes — our methods cover pressurised and gravity systems across water, wastewater and industrial/process networks.
What NDT techniques do you use?
Ultrasonic Thickness (UT) for quantified wall loss, Magnetic Flux Leakage (MFL) for rapid screening of ferrous lines, HD visual/CCTV for defect grading, and specialist sensors for non-metallics (e.g., guided wave/EMAT/acoustic where applicable).
How accurate are the results?
Ultrasonic Thickness (UT) for quantified wall loss, Magnetic Flux Leakage (MFL) for rapid screening of ferrous lines, HD visual/CCTV for defect grading, and specialist sensors for non-metallics (e.g., guided wave/EMAT/acoustic where applicable).
How do you ensure traceability of defect locations?
Chainage, datum control, location referencing and pipeline tagging ensure findings are repeatable and traceable across programmes.
What do the deliverables include?
Engineer-ready reports with annotated imagery, defect maps/grids, severity ratings and prioritised actions, plus raw data for your systems.
What sizes and lengths can you cover?
A wide range of diameters (commonly 100–10,000 mm) and long runs where access allows; scope and access determine the exact configuration.
What do you need from us to quote?
Objectives, pipeline material/diameter, flow state and access constraints, any previous data, drawings and preferred time windows.