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The thermowell may seem a fairly simple piece of equipment, designed to act as a barrier between a temperature sensor and the process medium. Yet it is fundamental to the safety of the process; a faulty thermowell can jeopardise the whole operation. Exacting standards, which the user needs to be aware of, govern the manufacture of thermowells.
Temperature is without question the most commonly measured variable in industry, being the simplest piece of information about the state of a process. In many applications, particularly where the process medium is fast flowing or pressurised, the temperature sensor needs to be protected from direct contact with the medium by a metal structure known as a thermowell. The integrity of the thermowell is essential to the process, as a leak or a structural failure will expose the contents of the pipeline to the atmosphere. For this reason, very strict standards govern the manufacture of thermowells. Although the thermowell is a fairly simple piece of equipment, there is still scope for things to go wrong. The main risk comes from vortices forming in the process medium around the thermowell, which can cause vibrations. The stresses caused around the stem of the thermowell by these vibrations can, over time, lead to failure. Incorrectly specifying pressure-retaining parts can have disastrous consequences, in the worst cases potentially leading to loss of life, loss of the plant and possible prosecution. Although the industry standards do not constitute law, deviation from them would be difficult to explain in court after an incident.

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