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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 Offshore Pipeline 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.



Through advanced inline inspection (ILI) technology to detect and characterize dents with a high degree of accuracy, TDW helps Offshore Pipeline 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.


In the Offshore Pipeline market, risk reduction is of utmost importance. TDW offers safe, proven 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 technicians, who have a long track record of successful offshore projects around the globe, ensure that the work entrusted to the company is done efficiently with minimal interruption to product flow

Whether operators need an emergency pipeline intervention or topside maintenance during a planned shutdown, HT&P offers safe and proven solutions for getting the project completed. The process incorporates a high 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 when combined with temporary bypass, it allows repairs to be performed without the need to stop product flow. The STOPPLE® Train Plugging System, for example, uses double block and bleed technology to help increase efficiency and safety during pipeline maintenance and repair. The system – which is able to create a double block and bleed seal through a single fitting – 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 creates a safe zone in high-consequence areas.

Whether operators are purchasing equipment to perform their own HT&P jobs or turning to TDW to execute the service, they can rely on the TDW line of equipment and consumables. The Subsea 1200RC tapping machine, for example, is a topside-driven hot tap machine that can be safely operated down to a depth of 3,000 meters (9842.5 feet). The machine has proven to be a highly reliable shallow and deep-water solution.

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


Removing dents or other defects typically requires repairing or replacing entire pipeline sections. TDW provides Offshore Pipeline operators with non-intrusive inline isolations that enable work to be done at full line pressure.

  • SmartPlug® isolation technology – The TDW double block and monitor SmartPlug tool is a remotely controlled and operated, non-tethered pipeline isolation system for oil and gas pipelines. It protects people, assets, and the environment while saving time and money compared to the temporary decommissioning of the entire pipeline. In addition, SmartPlug technology enables local hydrotesting of the replaced/repaired area without affecting the integrity of the initial isolation, which can be held in place. The SmartPlug tool also allows production and flow of other lines tied in to the downstream section of the isolated pipeline to continue uninterrupted. SmartPlug isolation tools are tracked and identified by the SmartTrack™ two-way communication system. The SmartTrack system is capable of through-wall communication in any pipeline medium and can operate in pipelines up to 50 millimeters (approximately 2 inches) thick. The system also allows for extremely precise tool positioning, with accuracy of +/- 25 millimeters (approximately 1 inch), depending upon the environment.