Rotork CVA failsafe electric process valve actuators have been selected for a critical flow control application in the Australian coal mining industry.

Coal seam gas is a hot topic in Australia with the rise of the Queensland Curtis LNG (QCLNG) facility, the world’s first LNG project to be supplied by coal seam gas.

The first cargo of LNG from BG Group’s QCLNG facility began on 28th December (2014). The start of production from the plant’s first LNG train is the result of more than four years of development and construction on Curtis Island.

Now, Rotork CVA has noted the significance of such projects on its business operations; the successful use of Rotork CVA actuators for similar duties at thousands of remote sites on the Queensland LNG project has made an ‘important’ contribution to the recent selection decision by Salcan Process Technology.

The company manufactures wellhead skids designed for coal mine degassing duties, used in conjunction with Salcan’s control and telemetry systems to enable methane and other flammable gases to be extracted from underground coal seams prior to the commencement of mining operations. Salcan has now chosen Rotork CVA actuators for its flow control needs in coal mining.

Salcan Director Vincent Cantwell explained, “The Rotork actuated control valve allows us to control the flow of gas while maintaining back pressure in the coal seam. Bluetooth technology embedded in a failsafe electric positioner package eliminates the need to enter the hazardous area surrounding the valve for set up and diagnostic functions.”

“In operation, back pressure on the coal seam is reduced in a controlled manner to protect the seam, thus maximising gas extraction. For a coal mine this is critical for reducing the risk of an underground explosion; for a gas producer it is critical for maximising the yield.”

The CVA delivers continuous, repeatable modulating control with a programmable fail to position option. Resolution, repeatability and hysteresis performance is quoted at less than 0.1% of full scale, offering suitability for the most demanding control valve applications, whilst low power consumption enables operation from renewable power sources such as solar panels.