Compressor Station Automation System
Introduction
Compressor station automation system (CAS) is intended for monitoring, protection and control of compressor station equipment. CAS comprises a range of functionallycomplete local systems of automatic gas-compressor units (GCU), compressor section (CS), gas-turbine power unit (GTPU), electric power supply (EPS), emergencyshutdown systems of GCU and CS, united into one information and control system operated by a compressorstation operator. CAS provides integration of monitoringprinciples and control of all operating procedures, independent maintaining of preset operation mode and its change according to operator's commands from the common control station.
Scope of Automation
- GCU (comprises a high-pressure turbine, low-pressure turbine, axial air compressors, combustion chamber, turboexpander, heat exchangers, centrifugal supercharger, etc.);
- plant for cleaning of main pipeline gas from dust;
- process shutdown and relief valves;
- gas intake, control and metering unit;
- pig launcher-receiver;
- oil supply system, oil eliminators and collectors;
- gas cooler;
- fuel gas treatment and supply unit;
- water supply equipment.
Main Features
- automatic monitoring of all necessary technological parameters, equipment and indoor environment state parameters;
- automatic protection of process equipment in case monitored parameters reach emergency and ultimate values as well as in case of support system failure;
- program control and maintaining of preset operation mode of core and support process equipment as well as regulatory conditions of equipment operation;
- program control of preparation and switching of equipment according to operator's commands;
- detection of equipment failures in the course of its operation and switching according to command execution control results;
- displaying and registration of main monitored technological parameters and those characterizing the state of the equipment during the process of pumping and in conditions of maintenance and commissioning works;
- preparation and communication of information processing results to the telemechanics system;
- CAS is a territorially distributed system built according to three-level hierarchical principle. CAS meets the requirements specified for technical controlling facilities:
- high reliability achieved by distributed control, self-diagnostics, backing-up of individual critical units;
- usabilty achieved by technological programming and object-oriented control;
- integration of different data acquisition channels into one system.
Separate local automatic equipment systems can be distinguished as parts of CAS middle level; these systems are equipped with own systems of human-machine interface and are able to work both as parts of CAS operated by operators and in a local mode.
Local automatic equipment systems and CAS are united into one technological network by means of redundant Ethernet network, fiber-optic communication lines are used to provide communication between remote local automatic equipment systems.
Benefits
- Flexibility
The system can be completed by modules allowing solving different automation tasks.
- Versatility
The system features compatibility with numerous filed devices from various vendors.
- Reliability
High level of CAS reliability is achieved by using industrial programmable controllers having high reliability rates, hardware components from industry-leading manufacturers, redundant equipment, communication channels, power supply and data backup software.
- Functionality
The system components provide for additional operation modes (simulation, testing and masking) and other features, such as unauthorized access protection and event logging to monitor personnel actions.
Block Diagram
