Solutions Engine

Line Modification

TDW employs a full suite of solutions to assess the condition of an operator’s line, isolate a section, and perform modifications without interrupting service.

In the Gas Transmission market, TDW line modification services enable operators to:

  • Analyze direct and indirect measurements of the pipeline.
  • Perform remediation safely while the line remains in service.
  • Keep lines running safely and efficiently, in compliance with company, industry, and regulatory standards.
  • Review and compare all pipeline data at the dig site.
  • Prioritize repairs of any anomalies in the pipeline.
  • Clean lines before inspection, increasing throughput.




Pigging programs enhance pipeline integrity for Gas Transmission operators by cleaning and removing built-up liquids, contaminants, and deposits on the pipe wall and increasing the probability that any pipeline modifications will be completed with no problems. Cleaning pigs prepare pipelines for evaluation and pipeline work, helping to improve data capture and accuracyas part of an integrity inspection, providing the most valuable information possible. 

  • VANTAGE® V cleaning pig Multi-use pig designed to remove both hard, crust-like and soft, gummy deposits, as well as ferrous materials.
  • VANTAGE® V batching pigMulti-use pigs used for batching, displacing, and light cleaning.
  • OptionAll™ batching and cleaning pig Designed for light cleaning, line filling and dewatering, batch separation, and liquid removal.
  • REDSKIN™ foam pig Used for light cleaning; one version incorporates a urethane cleaning wrap with bypass groove that effectively removes paraffin and other soft deposits that could lead to corrosion.
  • WCK cleaning pigRemoves contaminants and deposits that increase resistance to flow.
  • PitBoss™ cleaning pig Removes soft to medium-hard deposits from internal pits, which is essential to improving the effectiveness of corrosion inhibitors.

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


In the Gas Transmission market, where pipeline shutdown may not be an option, hot tapping and plugging (HT&P) technology allows operators to complete pipeline replacements and modifications – from making lines piggable to line lowering and relocations – with minimal flow interruption. TDW HT&P solutions protect customers’ 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 fitting, valve, tapping machine, and isolation technology – 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. 

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 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 for them, they can rely on the broad line of TDW equipment and consumables. The company engineers and manufactures nearly every component needed for an HT&P project, and TDW tapping and isolation equipment is 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.