Sea Terminal Automation System
Introduction
Sea terminal automation system (STAS) is intended for automation of LPG reception storage and shipping processes. LPG is delivered to a terminal in rail tank cars and transferred to tankers. LPG unloading is performed at 2 rail terminals.
LPG is unloaded by means of pressure drop produced in the tank cars by fumes coming from compressors which take out the vapor phase of the reservoirs, compress it, move it to vapor space of tank cars. After LPG unloading fume exhaust is carried out by the same compressors.
LPG is loaded to carriers via jetty fitted with loading arms connecting an onshore LPG pipeline to a tanker manifold flange.
Scope of Automation
- Railway terminals;
- Unloading racks;
- LPG tank farm;
- Jetty;
- Nitrogen unit;
- Automated valves.
- Automated LPG receipt, storage and shipping processes;
- Automated equipment protection and emergency shutdown system;
- Data exchange between onshore and jetty control rooms;
- HMI / process visualization at operator workstation located in onshore and jetty control rooms;
- Automated operation of accessory equipment;
- Visualization and registration of the main process variables and parameters characterizing equipment condition during normal operation, maintenance and commissioning;
- Generation of reports;
- Logging of events.
Main Features
STAS has centralized architecture with a pair of CPUs providing hot redundancy.
Data exchange with intelligent devices is realized by means of RS-485 interface via ModBus RTU protocol.
I/O servers and controllers communicate via Modbus TCP/IP protocol over fiber optic loop Industrial Ethernet network.
Benefits
- Flexibility
STAS can be completed by modules allowing solving different automation tasks.
- Versatility
The system features compatibility with numerous filed devices from various vendors.
- Reliability
High reliability of the system is achieved due to the use of system components with high reliability ratings.
- Functionality
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.
- Compatibility
STAS can be interfaced with other subsystems based on any industrial controller.
Block Diagram
