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Subsea Wellhead Ball–Valves

Shutoff off Subsea Wellheads With Integrators for Medium Pressure Ball–Valves

| Author / Editor: BILL MENZ / Dominik Stephan

...The substances under pressure are often flammable.

Finding the Right Connection

Integrators are frequently under very tight time constraints when they are building skids for platforms. The project may be behind schedule even before the fabrication begins. Therefore, efficient component assembly is critical to keep a project moving.

Cone and thread fittings are time consuming to assemble. Any imperfection in the cone or the nipple increases the likelihood of a leak. Concerns about quality have led some owner companies to require that the nipples be purchased from the factory rather than made on site. If the tubing length turns out to be short, a new piece must be ordered, resulting in a delay.

Withstanding Vibration Provides Reliable Valve Operation

Integrators are also concerned about vibration. A fitting must be able to hold up under vibration, not only during operation on the platform but also during transport to the platform (of operation). AGI found a solution in Swagelok Company’s mechanical grip tube fitting rated for medium-pressure connections to SAF 2507 tubing. The fitting contains two ferrules. Both the front and back ferrules grip the tube during installation (Figure 1). It is this robust grip that allows for working pressures up to 15,000 psig...

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