Abstract
The temperature transmitter is one of the most commonly used equipment in many industries and it is rather important to ensure the reliability during the design stage. In this paper, reliability analysis of the temperature transmitter for ethylene cracking furnace of which the environment was quite harsh was carried out. Firstly, the risk priority number method was adopted to perform the failure mode and effects analysis. Thermal and vibration simulations were conducted to investigate the temperature distribution and vibration response of the temperature transmitter in harsh environment. The mechanisms of high temperature oxidation corrosion and high temperature medium erosion of the temperature transmitter were also studied by microscopic and macroscopic examinations as well as fluid simulations. It is concluded that the harsh environment characterized by high temperature and acid-base environment, high vibration, high corrosive media scouring could result in special failure mechanisms for the temperature transmitter. The high temperature of the header and the local resonance of the temperature transmitter should be focused on in the reliability design. The metal material, processing technology and shape characteristics of the armor of the temperature transmitter sensor should be focused on to improve the reliability.
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