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Passing Valve

Valves that are leaking internally (passing valve) present a significant safety issue for Liquids Transmission operators that need to rely on these valves for isolation. A passing valve can pose a risk to personnel, the safe operation of the pipeline itself, and, in the case of an emergency, the environment and public. It is often necessary to isolate passing valves to enable them to be removed, repaired, or maintained.

TDW offers a full range of tools and services to help Liquids Transmission operators safely and easily prepare for valve removal, repair or replacement.

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In the Liquids Transmission market, where pipeline shutdown often is not an option, TDW offers safe and efficient hot tapping and plugging (HT&P) solutions for a wide array of pipeline defects and maintenance challenges, from dents to corrosion to valve failure.

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 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 a temporary bypass allows work to be performed without the need to stop product flow. The TDW STOPPLE® Train isolation system, for example, uses double block and bleed technology to help increase efficiency and safety during pipeline modification. This approach to line isolation, 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 helps operators better protect people and the environment.

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

Whether operators purchase equipment to perform their own HT&P jobs or turn to TDW to execute the service, they can rely on the company’s broad line of equipment and consumables. TDW engineers and manufactures nearly every component needed for an HT&P project, and the company’s tapping and plugging machines are considered the industry standard. To meet regional needs quickly and efficiently, TDW maintains equipment and consumables in service centers around the globe.

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. 

TDW also offers RES-Q® Wrap and Steel Repair Sleeves, quick, simple solutions that allow operators to keep their pipeline operational and within code

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