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
STAS can be completed by modules allowing solving different
automation tasks.
The system features compatibility with numerous filed devices
from various vendors.
High reliability of the system is achieved due to the use of
system components with high reliability ratings.
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.
STAS can be interfaced with other subsystems based on any
industrial controller.
Block Diagram
