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Passing Valve

Valves that are leaking internally (passing valve) present a significant safety issue for Offshore Pipeline 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 Offshore Pipeline operators safely and easily prepare for valve removal, repair or replacement.

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In the Offshore Pipeline market, risk reduction is of utmost importance. TDW offers safe, proven hot tapping and plugging (HT&P) solutions for a wide array of pipeline defects and maintenance challenges from dents to corrosion to valve failure. 

TDW technicians, who have a long track record of successful offshore projects around the globe, ensure that the work entrusted to the company is done efficiently with minimal interruption to product flow

Whether operators need an emergency pipeline intervention or topside maintenance during a planned shutdown, HT&P offers safe and proven solutions for getting the project completed. The 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 when combined with temporary bypass, it allows repairs to be performed without the need to stop product flow. The STOPPLE® Train Plugging System, for example, uses double block and bleed technology to help increase efficiency and safety during pipeline maintenance and repair. The system – which is able to create a double block and bleed seal through a single fitting – 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, they can rely on the TDW line of equipment and consumables. The Subsea 1200RC tapping machine, for example, is a topside-driven hot tap machine that can be safely operated down to a depth of 3,000 meters (9842.5 feet). The machine has proven to be a highly reliable shallow and deep-water solution.

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

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When Offshore Pipeline operators suffer a damaged valve that can be pigged through and flow is not restricted or stopped, TDW can facilitate a safe working environment for repair or replacement by isolating the pipeline in a pre-determined position at full line pressure using non-intrusive inline isolation technology

  • SmartPlug® isolation technology – The TDW SmartPlug inline isolation tool is a remotely controlled and operated, non-tethered, double block and monitor pipeline isolation system for oil and gas pipelines. It helps protect people, assets, and the environment while saving time and money compared to the temporary decommissioning of the entire pipeline. In addition, SmartPlug technology enables local hydrotesting of the replaced/repaired area without affecting the integrity of the initial isolation, which can be held in place. The SmartPlug tool also allows production and flow of other lines tied in to the downstream section of the isolated pipeline to continue uninterrupted.

    SmartPlug isolation tools are tracked and identified by the SmartTrack™ two-way communication system. The SmartTrack system is capable of through-wall communication in any pipeline medium and can operate in pipelines up to 50 millimeters (approximately 2 inches) thick. The system also allows for extremely precise tool positioning, with accuracy of +/- 25 millimeters (approximately 1 inch), depending upon the environment.