Design of a SCADA system to prevent freezing in oil pipes

Abstract

This paper presents a SCADA system based on Siemens WINCC implemented on a Web server to drive an Allen Bradley PLC to control temperature in two tanks, the first tank simulates a tank for collecting oil from several locations with different temperatures, and the second tank simulates an oil tank which is heated and used to defreeze the pipeline during winter. A tuned cascade PID is used to control the process. This has two advantages; firstly, this controller saves on fuel consumption and secondly, it eliminates the effect of feed tank temperature. The system could be controlled locally or remotely through the web server. The system could also send text messages using GSM to an IPHONE.