This page contains a Flash digital edition of a book.
SPECIALIST EQUIPMENT


Coal extraction application demonstrates the advantages of electro-hydraulic valve actuation


M


ount T orley Warkworth (MTW), an integrated operation of two adjacent open cast mines in the Hunter Valley region of New


South Wales, Australia, supplies international and domestic markets with semi-soft coking coal and thermal coal. Rotork actuators control the fl ow of water


from a two gigalitre (two million tonnes) dam source to the north and south coal processing (washing) plants. T e project includes an actuator on a pipeline supplying water to a new Water Cart Fill Point for routine dust suppression operations. Each water cart fi ll requires 120 tonnes of water to be delivered at a pressure high enough to overcome a 10m head. T e Water Cart Fill Point requirement was


very demanding, requiring an electric failsafe actuator to operate the isolation valve by solar power (i.e. 24 VDC), to be SIL-rated, and capable of closing a 500mm butterfl y valve in 10 seconds. Rotork was able to satisfy this specifi cation with a standard Skilmatic electro- hydraulic actuator.


Flexibility built in Skilmatic self-contained electrically powered actuators – comprising integrated control module, hydraulic manifold and a power unit consisting of a motor, hydraulic pump and reservoir — off er fl exibility and customisation to suit specifi c applications. Utilising an integral spring mechanism to provide the most reliable means of positioning valves to a pre-determined safe position, they have been specifi cally designed for use in critical fail-safe applications. T ey combine the simplicity of electrical operation with the precision of hydraulic control and the reliability of mechanical fail- safe action. With the intelligent control and


44 www.engineerlive.com


FAILSAFE ACTUATORS FOR COAL PROCESSING


monitoring systems, the actuators provide an ideal solution for two position, safety shutdown or precise modulating control applications. T e Skilmatic actuator combines absolute reliability with performance monitoring and


data logging, including valve torque/thrust signature and profi le and status and monitoring diagnostics. T e actuator can be confi gured using Rotork’s non-intrusive Bluetooth Setting Tool, and datalogger fi les can be transferred from the fi eld to a standard PC for storage and analysis as part of asset management routines. Rotork Skilmatic actuators are certifi ed to


the following standards: ATEX, INMETRO, IEC, FM, CSA and GOST. T e double-sealed electric enclosure is watertight and dustproof in ratings up to IP68. Specifi able for three-phase, single-phase or DC electrical power supplies, the Skilmatic range delivers rotary torque or linear thrust outputs that are suitable for valves of virtually any size and design. ●


Sarah Kellett is with Rotork. www.rotork.com


The Rotork Skilmatic electro-hydraulic valve actuator installation at Mount Thorley Warkworth. Solar panels seen in the background provide the renewable energy source to operate the actuator


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52