Thermowell short thermowells

Elbolef is used on 90° Long Radius Elbows (can be manufactured for Short Radius Elbows) for thermowell and instrumentation connections Available butt-weld to meet your specific reinforcement requirements, and 3000 and 6000 classes for socket weld and threaded applications. 

A too short thermowell in the side of a vessel invariably exhibits an increase in temperature, when the liquid level rises to submerge the thermowell. Figure 6.10 illustrates a common method of exploiting this... 

The fixed-bed reactor has a 2-in. inside diameter and a 60-in. inside length for a volume of 3 L (Figure 2). It is constructed of A-286 high-temperature alloy which can be operated at 5000 psig at 1000°F. It can withstand temperature overruns up to 1500°F for short periods. A thermowell runs through the center of the catalyst bed the entire length of the reactor. Heat is supplied to the reactor in five separately controlled heating zones. 

Short in the electrical circuit/grounding problems Improperly located thermowell ... 

The 4-inch swaged-up pipe section with reducers in Figure 7-104 can be connected into small-sized process pipe lines where short thermowells can be installed for dial thermometers and T/C assemblies. 

When distilling heat-sensitive materials, a correct temperature indication near the bottom is critical. Under these conditions, thermowells are also most likely to foul, and consequently, read low. The low reading can mislead the operator or automatic controller into adding heat at a time when heat input needs cutting. In one peroxide service accident (97), this led to an explosion. In such services, additional temperature connections should be positioned a short distance above the bottom to permit cross-checks. 

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