Protective sheaths for thermocouples in reaction vessels, ensuring accurate temperature measurement while shielding sensors from corrosive or high-pressure process media.
Thermocouple wells are cylindrical protective housings installed in reaction vessels to isolate temperature sensors (thermocouples) from direct contact with process fluids. They provide mechanical protection, prevent chemical corrosion of the sensor, and allow for sensor removal without interrupting the process. Critical for maintaining measurement accuracy in harsh chemical environments with high temperatures, pressures, or corrosive substances.
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Consider process temperature, pressure, chemical composition (especially chlorides, acids, alkalis), and mechanical stress. Common choices: 316 stainless steel for general use, Hastelloy for chlorides, Inconel for high temperatures, and tantalum for strong acids. Always verify compatibility with process media through corrosion charts.
Common failures include corrosion (chemical attack), erosion (high-velocity fluids), thermal fatigue (rapid temperature cycling), vibration-induced cracking, and improper installation. Material mismatch with process conditions is the primary cause of premature failure.
Insertion length must ensure the thermocouple tip reaches the process flow for representative measurement. Too short: measures wall temperature. Too long: increases vibration risk. Rule: insert at least 10x the well diameter into the process stream, with tip positioned in turbulent flow region.
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