The challenge The brief was to design and manufacture small bore subsea valves occupying positions deep within an XMT structure, due to space and location restrictions. They required stem extensions ranging from 1m to 6.3m so they could be controlled by a Remote Operated Vehicle (ROV) outside the structure. These were the longest stem extensions ever supplied by LB Bentley. Their design and manufacture involved significant technical considerations surrounding material specification and interface design. The soluTion LB Bentley’s engineering department used a blend of existing design modification and radical design to develop an effective solution. Material specification This demanded particular attention, including detailed assessment of tensile strength. The extensions ne

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