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- W4386971008 abstract "Abstract A subsea Christmas tree is an integral part of the barrier system allowing the controlled production of hydrocarbons while serving to shut in the production in case of an emergency or a need for a planned shut-down. The most important components of the Christmas tree are the barrier valves, most often remotely hydraulically operated, spring-loaded, and fail-safe gate valves. A primary or wing barrier valve is subjected to full wellhead shut-in pressure when closed. To open such a valve, the valve needs to be forced towards opening overcoming high friction and spring preload forces until the valve opens allowing flow to start and pressure to equalize across the valve. With the coming change to all-electric control systems (AES) dispensing with hydraulics for actuation, it would be highly beneficial to the controls design and power requirements if the operational forces and power required for valve actuation could be reduced. This paper investigates the possibilities of force and power reduction through the following ways: alternative lower friction coating material and geometrical change of the valve parts. As an alternative coating material polycrystalline diamond compacts (PDC) are analyzed. By geometrical change, we seek a solution whereby only a shorter stem displacement is required before the crack-opening and after the crack-closing phase. The valve is 3D modeled using the same subsea conditions, the model is analyzed using finite element methods." @default.
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- W4386971008 date "2023-06-11" @default.
- W4386971008 modified "2023-09-29" @default.
- W4386971008 title "Design Assessment and Optimization of a Barrier Valve for Subsea Applications" @default.
- W4386971008 doi "https://doi.org/10.1115/omae2023-102907" @default.
- W4386971008 hasPublicationYear "2023" @default.
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