Paladon Systems Ltd has launched the Autonomous Shutdown Valve (ASV). Designed for calm buoy or similar systems, the ASV automatically isolates pipeline risers on termination of pumping operations, or in the event of a linebreak condition. Historically, Pipeline End Manifold (PLEM) valves have been operated in one of two ways; either manually using divers, or automated using double-acting actuators reliant on buoy mounted control systems for motive power and control logic. ASV Product Manager, Mike Northwood explains that “The ASV is a completely self-contained subsea package consisting of the PLEM valve itself, a spring-return actuator and control system. With actuator motive power being provided from the subsea pipeline, the system is inherently fail-safe. On termination of pumping operations, or in the event of a linebreak condition, pipeline pressure will drop allowing the actuator spring to move the PLEM valve to its closed fail-safe position.”