X-Stream deepwater pipeline concept is newly developed to "significantly reduce the cost of a deep and ultra-deepwater gas pipeline while still complying with the strictest safety and integrity regime."
It's announced to reduce both pipeline wall thickness and welding or installation time compared to deepwater gas pipelines currently in operation. Exact wall thickness reduction depends on water depth, pipeline diameter, and actual pipeline profile. Typically for a gas pipeline in 2,500 m water depth - wall thickness reduction can be 25% to 30% compared to traditional designs, it's noted. X-Stream helps control pressure differential between a pipeline's external and internal pressures at all times. By using an inverted high pressure protection system (i-HIPPS) and inverted double block and bleed valves (i-DBB), the system immediately and effectively isolates deepwater pipe if pressure starts to fall. This maintains internal pipeline pressure above a critical level for any length of time.
Hovikveien 1, Høvik 1322 Norway
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