Vessel Modification

Making modifications to the high-pressure vessels used in refineries – from storage tanks to dehydrator vessels – is a complex undertaking that poses risks to people and property. 

Keeping the project safe, and within the parameters of regulatory and industry requirements, demands considerable expertise. Whether an operator wants to upgrade storage capacity, accommodate new safety regulations, or make a vessel repair, TDW can provide the necessary guidance and solutions. 

TDW offers a full suite of services, equipment, and consumables that allow pipeline owners and operators in the Hydrocarbon Processing market to:

  • Select the proper tools for their unique operation.
  • Continue product flow while the work is completed.
  • Keep people and the plant safe throughout the project.
  • Keep system pipelines in compliance with company, industry, and regulatory requirements.
  • Consult with TDW experts during any phase of the project.




In the Hydrocarbon Processing market, where hundreds – or thousands – of employees often work in close quarters and capital investments may be in the hundreds of millions – or even low billions – of dollars, safe pipeline repairs are of utmost importance. TDW offers safe, proven hot tapping and plugging (HT&P) solutions that allow pipeline owners and operators to complete pipeline replacements and modifications – from making lines piggable to line lowering to relocations – all while their line is in service.

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 is safely isolated and evacuated, the line modification can be performed.

The isolation solutions offered by TDW play 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.

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 equipment and consumables by TDW. 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.