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INSTRUMENTATION • ELECTRONICS


deployed in LNG PROJECT


COMPACT ACTUATOR


The Queensland actuator scheme was a successful example of a ‘one day install’ project


These remotely sited wellhead separators are designed to operate under a wide range of conditions. They include an automated control system with instrumentation and communication/telemetry to a central control room to enable operator assisted start up, shut down and monitoring. Traditional skid designs take an average of two


A


weeks to commission but, as the name suggests, the operator believes that, once delivered to site, the ODI skid can be operational within a day. The ODI design has attracted a lot of attention from all the major players in the Australian LNG industry. Previously, produced gas was used as the operating


medium for the actuators, but in some areas this is not feasible, so the operator searched for an economical and reliable electric alternative, capable of operating in remote areas from renewable power sources.  CMA actuator is available in linear, part-turn and multi-turn versions. They facilitate the economical operation of numerous types of control valve, damper and pump stroke adjuster applications. Single-phase or DC electrical power supply is all that is required for control valve actuation, saving the on-going costs associated with the operation and maintenance of instrument air supplies.


MAINTENANCE-FREE The maintenance-free CMA drivetrain, environmentally protected to IP67 and permanently lubricated for operation, even in sub-zero temperatures,


52 www.engineerlive.com


modulating actuator was recently installed on a ‘one day install’ (ODI) wellhead gas/ water separator skid bound for the giant  natural-gas (LNG) project in Australia.


Sarah Kellet reports on an electric process control actuator that assisted a ‘one day install’ for LNG separator skids


can be mounted in any orientation. Accepting an industry-standard 4-20mA control signal, the CMA provides accurate, repeatable and backlash-free  and quarter-turn applications, two degrees on the multi-turn models. All CMA actuators have output speeds that are adjustable down   manual operation is provided as standard.   DeviceNet and Foundation Fieldbus. 


the valve, combined with a vivid LCD display of valve position that also incorporates critical and non-critical fault symbols. Control selection   operation and Open or Close input commands in the Local control mode. Each mode can be locked in place to prevent unauthorised operation. The LCD display shows the valve position as a precise percentage of total valve travel. For fail-to-position performance, a reserve power


The CMA actuators


feature a maintenance- free drivetrain


pack provides the actuator with the ability to perform a predetermined action on power failure. The power pack also preserves position indication on the LCD display during power failure. Upon restoration of mains power, the power pack is swiftly recharged to ensure continued fail-to-position functionality. Action on power  interface as part of the user-friendly actuator set-up menu. 


Sarah Kellett is with Rotork. www.rotork.com


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