Parker Instrumentation has provided a custom-designed, compact double block-and-bleed valve to reduce the size and weight of a groundbreaking skid produced for the Chevron Tahiti platform in the Gulf of Mexico. The chemical injection skid, built by Test Automation & Controls, has been designed to withstand pressures of up to 1034 bar, as required for operations in the Tahiti field’s sub-salt reservoirs. The company says the valve provides a double block-and-bleed function which meets the required pressure rating.
According to the manufacturer, at such operating pressures, typical valve configurations are usually made from discrete components. This can inflate the amount of space needed as well as the weight and can also increase the number of potential leak paths. The company says the number of components is often made higher because of a need to combat problems arising from vibrations. The cone and thread interfaces used to make connections at these pressures are usually fitted with additional anti-vibration accessories which, of course, take up more space. To simplify the project, Parker designed an upgraded version of its single-piece 690 bar double block-and-bleed manifold, fitted with its unique 1034 bar-rated, MPI compression tube fittings.
The developer claims the resulting manifold is estimated to have reduced the mounting space and weight budgets by around 50 %. It has also replaced around nine individual components, three valves and six anti-vibration glands, to greatly reduce the potential leak paths.
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