Dents

Dents and other mechanical damage that reduce pipeline strength may not be immediate threats to structural integrity. However, left undetected or unrepaired, even small dents and damage can lead to operational difficulties and pipeline failure.

Dents can also damage both internal and external pipeline coatings, which may result in cracking or corrosion. In addition, dent re-rounding – which occurs when an indenting object is removed and pressure inside the pipeline causes the dent to spring back – is associated with localized stress and strain, which can cause cracking.

TDW uses advanced technology to help Gas Distribution operators:

  • Detect and characterize dents in order to comply with integrity requirements.
  • Identify interacting threats.
  • Prioritize repairs.
  • Execute dent removal without shutdown.
  • Mitigate defects before failure to avoid costly pipeline incidents.
  • Keep pipeline systems at operating capacity.

STEP 3 / VIEW SOLUTIONS

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Through advanced inline inspection (ILI) technology to detect and characterize dents with a high degree of accuracy, TDW helps Gas Distribution operators avoid operational issues such as flow restriction or pig passage problems, as well as pipeline failures.

  • KALIPER® 360 technology TDW originated KALIPER technology for new construction pipeline bore assessment in the late 1960s, ultimately changing how pipelines are constructed and validated prior to being placed in service. Today, advanced KALIPER 360 technology is used to capture baseline geometry information for new construction as well as geometry data for in-service pipelines.
  • Deformation (DEF) technology – This technology provides high resolution geometry for dents and dent strain, including the ability to detect the slightest bore changes.
  • Magnetic Flux Leakage (MFL) – This high resolution technology detects and sizes corrosion features. Utilized primarily in small diameter liquids pipelines.  When combined with DEF, dents with volumetric metal loss can be identified.
  • Gas Magnetic Flux Leakage (GMFL) – This high resolution technology to detect and size corrosion features is utilized primarily in natural gas pipelines. When combined with DEF, dents with volumetric metal loss can be identified.
  • Multiple Dataset (MDS) platform – The platform combines multiple technologies to generate comprehensive mechanical damage assessment in a single tool run.
  • XYZ Mapping (XYZ) – This supplies highly accurate location information about every defect reported by pairing global positioning system (GPS) coordinates with inertial mapping.

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TDW provides a systematic, non-destructive in-ditch approach to ensuring that the entire affected area of dents, whether visible or not, is thoroughly evaluated and free from any defects caused by changes to the material due to the deformation. 

By visualizing whether the area surrounding the dent has experienced permeability changes, TDW will be able to determine how much of the area requires further investigation. Gas Distribution operators receive a report that includes photo documentation of the entire NDE process and indicates the correlation between the inline inspection (ILI) tool’s findings and the actual dent.

  • Eddy current array (ECA) - Provides a highly sensitive means of detecting permeability changes and surface connected flaws while pipelines are in service, allowing pipeline owners and operators to prioritize repairs and prevent flow interruptions.
  • Manual profile gauge – Measures dent profiles with a high degree of accuracy, providing a greater understanding of defects.
  • Digital pit depth gauge – Accurately measures the depth of dents.

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TDW offers Gas Distribution market owners and operators hot tapping and plugging (HT&P) solutions for a wide array of pipeline defects and maintenance challenges from dents to corrosion to valve failure. TDW equipment and services are engineered for safety and efficiency, allowing operators to better protect their employees and the surrounding community. 

The HT&P process incorporates a low pressure pipeline fitting, valve, tapping machine, and isolation equipment – all working together to provide a safe and proven isolation solution. Once the area of pipeline that needs work has been safely isolated and evacuated, the line modification can be performed. 

TDW isolation technology plays a critical role in this process, and a temporary bypass allows work to be performed without the need to stop product flow. The TDW STOPPLE® Train isolation system, for example, uses double block and bleed technology to help increase efficiency and safety during pipeline modification. This approach to line isolation, which only requires a single pipeline tap, reduces costs associated with fittings, valves, welding, and inspection services. The bleed port affixed on the line ensures that any product that bypasses the first seal is contained and evacuated through the bleed port, which helps operators better protect people and the environment.

Whether operators are purchasing equipment to perform their own HT&P jobs or turn to TDW to execute the service for them, they can rely on the company’s broad line of equipment and consumables. TDW application engineers are recognized industry experts, ready to assist operators through each project phase – from start to finish. To meet regional needs quickly and efficiently, TDW maintains equipment and consumables in service centers around the globe.

TDW also offers RES-Q® Wrap and Steel Repair Sleeves, quick, simple solutions that allow operators to keep their pipeline operational and within code.

To prepare for future challenges, operators have the option of creating an Emergency Pipeline Repair System (EPRS), which equips them to take a proactive approach to pipeline emergencies. Working with the TDW team, operators will have the planning and resources in place to repair and recommission their pipelines — and restore product flow — in the shortest time possible.