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Change in Service

Changing the services, reversing flow, or re-purposing a pipeline is a major undertaking that can involve many activities including cleaning, inspection (for integrity), repairing, making modifications, and prime moving equipment (e.g., pumps, compressors etc.).

TDW services enable Liquids Transmission operators to:

  • Ensure the line is clean, which may include decommissioning and product removal.
  • Inspecting the line and providing information on any integrity concerns for the planned use.
  • Ensuring required modifications can be completed without shutdown (e.g., connecting to an existing operation system).
  • Ensure compliance with company and regulatory requirements.
  • Reduce the risk of costly project delays and over-runs.
  • Protect people, the environment, and communities throughout the project.



Efficient, effective, and easy to launch and retrieve, pigs are the preferred tools for a variety of pipeline maintenance and integrity activities related to changes in service.

From cleaning and gauging to liquids displacement and preparation for pre-inline inspection (ILI), TDW can help Liquids Transmission operators select and deploy the appropriate pig for the purpose, pipeline, and product. 

Pigs for cleaning and pre-ILI preparation:

  • OptionALL™ cleaning pig  Effective for cleaning, maintenance, batching, and displacement. Can be customized with attachments appropriate for clearing pipeline solids, including discs, cups, magnets, brushes, and blades.
  • VANTAGE® V cleaning pig  – Multi-use pig that can be equipped with brushes to remove hard, crust-like deposits, urethane blades for removing gummy deposits, scraper discs to clean both hard and soft deposits, and magnet kits to remove ferrous material.
  • PitBoss™ cleaning pig  – Designed to remove soft to medium-hard deposits from internal pits.
  • FJR/JRN cleaning pig  – Equipped with wire brushes and urethane cups to remove contaminants and deposits from pipelines.
  • VANTAGE®+ cleaning pig  – Multi-use pig that can remove hard internal pipe deposits such as mill scale, crust, and calcium deposits as well as thick, soft contaminants including sludge and mud.
  • REDSKIN™ foam pig – Available in five different configurations, including the REDSKIN RoughRider® pig for removing hard deposits.
  • WCK cleaning pig – Built to remove pipeline contaminants and deposits, with an outlet port at the pig’s front end to prevent loosened material from piling up. Available in a dual diameter model for cleaning multiple sizes of pipe in one run.
  • Pencil brush cleaning pig – Heavy-duty, aggressive, and effective at removing black powder and cleaning deposits from internal pits. Removable bypass plugs provide jetting action to improve cleaning effectiveness. 

Pigs for gauging deformation:

  • OptionALL™ SO-G gauging pig – Designed for pipelines from 4 inches through 14 inches. Available with multiple gauge plates, providing pipe clearance information in a single run.
  • VANTAGE® LV-G pig For pipelines 16 inches and larger. Combines the strength and durability of the steel-bodied VANTAGE V steel cleaning pig with our proven aluminum gauging discs.
  • Polly-G REDSKIN™ foam pig Available in medium- and high-density foam with aluminum gauging plate bolted on.
  • X-Pig® multi-purpose utility tool  Versatile, one-piece tool molded from our proprietary Formula SI™ urethane. Available with optional bolted-on gauging plate.

Pigs for liquids displacement:

  • UNISPHERE™ pig  – Heavy-duty inflatable sphere that remove liquid hydrocarbons and water from pipelines and piping systems.
  • OptionALL™ batching pig  Designed for light cleaning, line filling and dewatering, batch separation, and liquid removal.
  • VANTAGE® V batching pig Used for batching, displacing, and light cleaning.
  • X-Pig® multi-purpose utility tool  Flexible and versatile all-urethane pig that can negotiate tight pipeline turns. Appropriate for cleaning, batching, and displacement operations.
  • VANTAGE® + pig – Can be used for batching and displacement. Flexible in tight bend pipelines and can traverse a 20 percent reduction in interior pipe diameter.

Technical assistance is available from TDW subject matter experts for special circumstances or if the path to a solution requires consultation.


Changes in service can impact pipeline integrity by altering the conditions under which a pipeline operates. As part of establishing new service, Liquids Transmission operators rely on advanced inline inspection (ILI) technology to assess and characterize any existing anomalies, which helps provide a baseline for monitoring and future pipeline assessments.

The high degree of accuracy in ILI tools from TDW can help pipeline owners and operators avoid multiple inspection runs and unnecessary excavations, saving time while lowering operational risks and costs. 

  • Multiple Dataset (MDS) platform – Combines multiple technologies including deformation, high field axial magnetic flux leakage (MFL), SpirALL® MFL, low field MFL, and XYZ mapping to generate comprehensive, critical information in one tool run. MDS can assess a pipeline for bore reductions, metal loss, long seam defects, mechanical damage, hard spots, and more – in a single inspection.
  • SpirALL Electromagnetic Acoustic Transducer (EMAT) – Optimizes the number of receivers and transmitters through the use of a helical magnetic field. EMAT inspects for axially oriented crack/crack-like defects, such as stress corrosion cracking and hook cracks, that are below the detectable limit of spiral magnetic flux leakage (SMFL).
  • XYZ mapping (XYZ)  Supplies highly accurate location information about every defect reported by pairing global positioning system (GPS) coordinates with inertial mapping. In addition, XYZ offers the ability to calculate bending strain.


In the Liquids Transmission market, where pipeline shutdown may not be an option, hot tapping and plugging (HT&P) technology allows operators to expand lines, make connections and tie-ins, launch new services, and upgrade capacity – all while their line is in service. TDW HT&P solutions protect operators’ revenue stream while minimizing risk and are available for a wide spectrum of pipelines, environments, and products. 

The HT&P 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 requires work has been safely isolated and evacuated, the line modification can be performed. 

The full suite of isolation solutions offered by TDW plays a critical role in this process. The TDW STOPPLE® Train isolation system, for example, uses double block and bleed technology to help increase efficiency and safety during pipeline modification. The system – 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 bypassing the first seal is contained and evacuated through the bleed port, which creates a safe zone in high-consequence areas. 

Because double block and bleed technology plays such a large role in protecting people, the environment, and communities, a number of regulators in Canada now require it for HT&P projects – and American regulators are moving in that direction. 

Whether operators purchase equipment to perform their own HT&P jobs or turn to TDW to execute the service for them, they can rely on the broad line of equipment and consumables from TDW. The company engineers and manufactures nearly every component needed for an HT&P project, and TDW tapping and plugging machines are considered the industry standard.

TDW can also partner with operators before the work begins, providing consulting services to help them make optimum use of TDW products and services. TDW application engineers are recognized industry experts, ready to assist operators through each project phase – from start to finish.