Abstract
The pumping of ethylene at supercritical conditions over long distances demands sophisticated pumping stations. One condition that must be avoided at all times anywhere in the line is the generation of temperature hot spots, as these can lead to thermal decomposition of the ethylene under pressure with potential catastrophic consequences.
Both submerged motor driven pumps (canned pumps) and more conventional machines with mechanical seals have been used in this application: opinions are sharply divided as to which is the optimum design. The authors contend that no single answer exists but in either application the ability to safely disperse any leakage and to accurately diagnose machine conditions to detect any potential hot spots is of paramount importance. A sophisticated health monitoring is required for the pumps with temperature sensors as well as vibration monitors: the rate of temperature rise is an important parameter in these applications. This condition-monitoring installation should be linked back to the central control station via a SCADA (supervisory control and data acquisition) link.
Innovative condition-monitoring features such as temperature-measuring devices installed between each pump stage are reviewed and their potential benefits assessed.
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