![]() However, for thermowells mounted by direct welding into a pipe wall, the support plane will actually be a curved surface with the same curvature as the inner pipe wall. ![]() For thermowells mounted on flanges or welded into weld adaptors, the support plane will be a flat plane. The unsupported length, L, is calculated as the distance from the tip of the thermowell to the intersection of the thermowell axis with this surface. ![]() 4-1-1 indicates the support plane, which is an imaginary extension of the supporting- structure surface that passes through the shank of the thermowell. Use of ball joints, spherical UflIOflS, or packing gland installations are not permissible in Performance Test Code applications. The selection of a specific attachment method is subject to the governing piping or pressure vessel code. These figures are representative of common practice but do not display all allowable attachment configurations. Typical thermowell attachment configurations include threaded, socket weld, weld-in, lap-joint (Van Stone), and integral- flanged as shown in Figs. ASME PTC 19.3 TW-2016 pdf download – Thermowells.įigure 4-1-1 shows a schematic diagram of a thermowell, along with its characteristic dimensions.
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