Antisurge & Performance Control (AS&PC)
[ Vanguard | Reliant | Series 3++ | Series 3 Plus ]

An axial or centrifugal compressor can be severely damaged if process conditions reduce its gross flow below a minimum surge limit, and can also be damaged by conditions that would require flow rates in excess of a maximum choke limit. Each compressor needs an Antisurge Control Application to protect it from surge (and choke) and a Performance Control Application to regulate its capacity.

Antisurge Control Application (AS)
The only way to prevent surge is to recycle or blowoff flow to keep the operating point away from the surge limit. Because compressing this extra flow entails an economic penalty, the control system must accurately determine how close the compressor is to surging and then maintain an adequate but not excessive flow rate. Our unique combination of surge prediction and antisurge control algorithms protect your machines with the smallest possible recycle rates.

Performance Control Application (PC)
The primary function of a compressorÿs performance controller is to regulate its throughput as required to keep a capacity control variable equal to a desired set point.

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Steam Turbine & Extraction Control (ST&EX)
[ Vanguard | Reliant | Series 3++ | Series 3 Plus ]

In principle, axial and centrifugal turbines and expanders are the opposite of their turbocompressor counterparts. Instead of using energy from a spinning shaft to compress a low-pressure gas flow, they take energy from high-pressure steam or gas flows and transfer it to rotating shafts. Multisection turbines have additional ports where steam can flow in or out at intermediate pressures. These require Extraction Control Applications for each extraction or induction stream.

Steam Turbine Control Application (ST)
The basic objective of a steam turbine speed controller is to vary the flow of steam to keep the turbine operating at some desired speed, regardless of variations in the load imposed on its driven equipment or the quality of the steam. In some applications that speed is fairly constant, in others it is continuously varied as a means of achieving another control objective.

Extraction Control Application (EX)
Multisection turbines require an additional control loop to regulate each extraction/induction port's pressure or flow. A Series 5 Control System for such a turbine combines a Speed Control Application with the required number of Extraction Control Applications to regulate its speed and the volumetric, mass, or square root or pressure in each extraction header.

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Gas Turbine Control (GT)
[ Vanguard | Reliant ]

Fundamentally, gas turbines convert the chemical energy of one or more fuel flows (gas or liquid) into kinetic energy by transferring it to one or more rotating shafts. Incorporating both a turbocompressor and an expansion turbine, along with an intermediate combustion chamber that is often on the verge of either melting or flaming out, they are the most difficult of all turbomachines to control.

Gas Turbine Control Application
The basic objective of a gas turbine fuel controller is to keep the turbine operating at some desired speed, regardless of variations in its load or the quality of its fuel. As with steam turbines, this is often implemented using a cascade scheme that manipulates the speed set point as needed to maintain the desired value of some other process variable, such as a compressorÿs discharge pressure.

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Utility Turbine Control (UTC)
[ Vanguard | Reliant ]

The Series 5 Utility Turbine Control Applications provide a comprehensive set of control functions for steam turbines driving a utility generator. The Utility Turbine Control (UTC) function ("Load" control), Intercept Valve (IV) control function, Power Load Unbalance (PLU) function, Valve Management (VM) function, and Position control function work in conjunction with Series 5 Speed and Extraction Controllers to provide coordinated control of all aspects of steam turbine operation, from start-up through shutdown.

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Expander Control (PRT)
[ Vanguard | Reliant ]

The Series 5 Expander Control Applications provide a comprehensive set of control functions for power recovery trains. A typical power recovery train (PRT) includes a flue-gas expander, a main air blower, and a synchronous or inductive motor/generator. Some also include a steam turbine or an auxiliary motor-driven air blower for starting the unit. PRTs are commonly employed in fluidized-bed catalytic cracking units (FCCUs).

For additional questions please contact CCC satellite office near you