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Coupon Removal

One of the simplest, most cost-effective tools for monitoring internal pipeline corrosion is a curved piece of metal known as a coupon. Operators weigh the coupon and place it in a holder mounted to the pipeline’s interior wall. From there, operators monitor the coupon to see if it has lost weight. Over time, operators can use the coupon’s weight loss data to estimate the rate of corrosion within the pipeline so they can prioritize repairs. 

TDW can provide the equipment and expert services necessary to facilitate pipeline access so operators can place coupons in their line and remove them for monitoring.

TDW allows pipeline owners and operators in the Liquids Transmission market to:

  • Select the right tools for their pipeline and product.
  • Facilitate coupon placement and retrieval.
  • Continue product flow while projects take place.
  • Keep people and the environment safe while the work is performed.



When operators use coupons to gauge internal conditions within their pipelines, it is important to place the coupons in a clean environment. Coupons are then more likely to provide an accurate picture of corrosion, scale build up, and other conditions that occur over time. Pigging cleans the lines and removes deposits from pipeline walls, which not only helps ensure successful line access for placing the coupon and removing it for monitoring, but also contributes to more accurate monitoring.

TDW offers Liquids Transmission operators an array of pigging solutions to help clean their pipelines, and the company’s subject matter experts can provide advice and consulting services to help select the best choice for their situation.

Cleaning pigs:

  • 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 pig – Multi-use pig that can be utilized for cleaning.
  • OptionAll™ batching and cleaning pig – Designed for cleaning, along with 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 pig – Removes contaminants and deposits.
  • PitBoss™ cleaning pig – Removes soft to medium-hard deposits from internal pipewall pitting.

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


In the Liquids Transmission market, where pipeline shutdown may not be an option, hot tapping technology provides operators safe, proven solutions for projects ranging from establishing purge points to placing a pig passage indicator or thermowell within a live line’s interior.

The tapping process calls for a high-pressure fitting , valve, and tapping machine – all working together to provide a safe and effective solution for creating an access point into a pipeline. This access point can then be used for inserting small probes, such as TDW PIG-SIG® pig passage indicators, or a multitude of other small sensors.

Whether operators are purchasing equipment to perform their own hot tapping and isolation jobs or turning to TDW to execute the service for them, they can rely on the TDW line of equipment and consumables. For example, the T-101 machine is the industry standard for small tapping projects, and when operators purchase a T-101 machine directly from TDW, they have the option of receiving training as part of the TDW Training Department’s LineMaster™ program. TDW offers the highest quality of training, which aligns with U.S. Department of Transportation operator requirements.

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.