Control system handles oil field conditions
A
Midland ACS product story
Edited by the Engineeringtalk editorial team
Jun 25, 2007
Midland-ACS' control system was chosen by gas turbine heat recovery specialist Citech to control its innovative adjustable cylindrical damper design.
Midland-ACS has developed a control system capable of operating in the harsh environment of gas turbine heat recovery systems destined for the Al Shaheen oil field in Qatar.
Working alongside Citech, formerly Alstom Energy Systems SHG, Midland-ACS' design was chosen by the gas turbine heat recovery specialist, to control its innovative adjustable cylindrical damper design.
The Citech heat exchangers are designed specifically for use on the Maersk Oil operated Al Shaheen field offshore facilities, as part of a US $5 billion project to increase the output of Qatar's Al Shaheen oil field to 525,000 barrels per day, from its current level of 240,000 barrels per day Typically used in oil refineries, a total of nine large bore cylinders, complete with three control panels were provided to Citech to lift their cylindrical damper on the heat exchangers.
Manufactured to be Zone 1 (Eexd) compliant with ATEX-approved electrics, the cylinders have a bore of 160mm and a stroke of 916mm, lifting vertically to control each damper.
Made from an epoxy coated steel barrel and incorporating the hollow 316 stainless steel piston rod housing the linear transducer, the cylinders can operate in temperatures ranging from -20C to +80C.
Each bank of three cylinders is controlled by a separate control panel.
The linear transducers contained within the cylinders manage the stroke in the damper cylinder to control the heat exchange process.
Boosters used in conjunction with Smart positioners give a fast speed of operation.
The smart positioners also incorporate the HART protocol.
The HART or "highway addressable remote transducer"protocol was chosen for its 1200 baud frequency shift keying (FSK) process to superimpose high-resolution digital information onto a conventional 4 to 20mA analogue signal.
This allows both intelligent digital field devices and current generating physical actuation signals to integrate seamlessly in a wider automation system.
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