iGAS have recently completed an Automatic Tanker Analysis (ATA) System for a major UK customer. The system is to analyse quality of product in Cryogenic Road tankers and storage vessels. The system is designed such that Tanker drivers start and stop the process and minimal interface is required with the Air Seperation Unit (ASU) operators.
The system is comprised of 6 Driver Interface Units (DIU) located at the Argon, Nitrogen and Oxygen Liquid fill points as well in the drivers mess room. The Analyser Cabinets and Scada PC are located in Control Room.
iGAS integrated analysers from Servomex, Siemens and Control Analytique into two control cabinets to replace obsolete equipment previously installed. Meeco moisture analysers were installed in the field close to the sample points. Double Block and Bleed valve blocks from the Parker R-max Stream Switching system allowed fast, reliable changeover of sample/calibration streams without risk of cross contamination. Sample flows are monitored to ensure a representative sample is achieved from the selected source. In total the panels switch 24 tanker, storage and calibration gas sample lines.
The ATA control system is based upon the Siemens S7-300 PLC, programmed using a mixture of S7-Graph and Ladder. The system was networked using PROFIBUS and consisted of ET200 I/O and Siemens HMIs. A Siemens WinCC Scada System collects analysis, calibration and weighbridge information and records the information into a database using SQL. Product purity notes are printed using customer templates following successful completion of pre- and post-fill analysis