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
The system can be completed by modules allowing solving
different automation tasks.
The system features compatibility with numerous filed devices
from various vendors.
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.
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
