The Thermowells is a tubular fitting that protects the temperature sensors for industrial process. Thermowell is a tube that has closed one end and opens at other so that they are mounted in process stream. Thermowells is used in many types of temperature sensor that includes Thermocouple, Thermometer and Resistance temperature detector. The Thermowells is inserted in the open end tube that has the open air outside for vessel or piping. Apart from these Thermowells is useful form protecting the instrument from the flow-induced forces, pressure as well as chemical effects. The process fluid in the Thermowell also transfers the heat in thermowell wall so that it will transfer the heat with the sensors. Maximum temperature of the instrument depends on materials used in the Thermowell. The Thermowells designs are useful for the thermowell calculation as dynamic element calculation so that error can be determined. The Thermowell is normally made from the metal bar stock and red...