Bottom loading arm has been widely applied in petrochemical plants and oil refineries and depots to loading light oil (i.e. gasoline, diesel, jet fuel, and naphtha) and benzene (benzoyl, methylbenzene, dimethyl benzene). Our company designed an automatic Quantitative Loading Control System which is fully functional, technical advanced, structure reliable, and handle easier and work stable.  This system can complete parameter setup, data collection, flow temperature compensation, quantitative control, procedure operation, overfill prevention and antistatic interlock, operation monitor, and report printing etc, in loading process. It also offers communication interface to connect external PCs. The quantitative oil loading control system is very helpful for the bottom loading arm to give its maximum performance by increasing the precision, speed, reducing human error and pollution, thus improving the efficiency and saving energy. Our objectives are safety, labor efficiency, ease-of-use, time saving, and ultimately higher returns.

Function
　　The system has distributed field control and centralized remote control function. In order to ensure reliability, these two control functions can be simultaneously available. When it occurs abnormal cases in the control room, the operators can continue loading works at individual loading lots by field controller.

◆Field controlled loading: Operators could conduct loading on-site loading lots based on the Operator's Manual.
◆Remote controlled loading: All loading lots would be accessed through the central control room where operators could conduct loading to single or multiple tankers. The oil loading system data is consistent field showing data, and generates complete loading information.

Characteristic

◆Distributed control and centralized management
◆Flexible architecture that supports big expansions
◆Combination field condition and user’s need with Strong application and     effectiveness　　

◆Adjusted organize data display format
◆Automatic monitor and control valve on site
◆High reliability by rapid switching between master/slave set

Applications
Petrochemical plants, large oil depots, light oil, benzene, industrial chemicals, tank truck loading.

Technical Feature of Loading Control System
◆Safety: Designed to be explosion-proof; grounding connection and high anti-interference.
◆High adjustable precision control and self-calibration. 

◆Electro-hydraulic valves adopt Variable time step flow control to ensure minimum flow after valve shut-off, and achieve the maximum eliminating fluid hammer. 
◆Automatic flow calculation and control process adjustment ensures high precision. 
◆Adopt Special communication card offers fast polling which is several hundred times faster than ordinary serial ports, allowing real time monitor of field oil loading process. 
◆Electrostatic overfill protection: When the electrostatic chuck is not properly connected and the level exceeds that of overfill sensors, oil loading process will be rejected or terminated, and alarm be sounded,

Intelligent program control ensures precision of measurement. 
◆Bi-level power source control circuit: the electro-hydraulic valve and pump control circuit will be shut-off at the ending of loading process to prevent false tripping caused by possible controller failure. 
◆Used Electronic switch for all output control so as to ensure the controller long term reliability. 
◆Multiple control mode, can switch between manual/automatic two-ways.     
◆Power fail protection: Parameters backup any time and automatic restore after power on. 
◆Status indicators of flow, valve, operation, alarm, temperature, etc. for system fault diagnosis and troubleshooting. 
◆Lightning protection and filter circuit guards the system against lightning and interference, enhancing stability. 
◆Real time temperature compensation ensures precise oil loading density. 
◆System self-checks ensures correct controller behavior. 
◆Online update for system control program