The American Society of Mechanical Engineers (ASME) uses Performance Test Codes (PTC) to evaluate the performance and operability of specific mechanical equipment. The results obtained from these Codes provide insight into how well the equipment performs its intended function. Specifically, the ASME PTC 19.3 is a thermowell stress calculation that demonstrates the chosen material and mechanical design will withstand the effects of operating conditions. This calculation offers guidance for comparing the shedding frequency and natural frequency of the thermowell. To determine the dimensions and suitability of a Thermowell based on process conditions, a Wake Frequency Calculation is utilized. Our engineers do Stress Calculations per ASME/ANSI PTC 19.3-74 where high velocity or pressure can be critical and to determine the Wake frequency calculations. A velocity collar can help here. Coating: Thermowells can be supplied with a coating for chemical resistance such as Teflon PTFE, PFA, FEP and Halar – ECTFE. To achieve abrasion resistance we can add the thermowell surface with a Stellite , Eutalloy or Ceramic layer. Further we can assist with the choice of material.