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ASME PTC 19.3 TW

Thermowells Performance Test Codes

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Organization: ASME
Publication Date: 26 February 2016
Status: active
Page Count: 62
scope:

This Standard applies to thermowells machined from bar stock and includes those welded to or threaded into a flange as well as those welded into a process vessel or pipe with or without a weld adaptor.

Thermowells manufactured from pipe are outside the scope of this Standard. Thermowells with specially designed surface structures (e.g., a knurled surface or a surface with spiral ridges) are beyond the scope of this Standard, due to the difficulty of providing design rules with broad applicability for these types of thermowells.

Thermowell attachment methods, standard dimensions, parasitic vibration of a sensor mounted inside the thermowell, and thermal equilibrium of the sensor relative to the process stream are beyond the scope of this Standard. In addition, thermowells fabricated by welding, including flame spray or weld overlays, at any place along the length of the shank or at the tip are outside the scope of this Standard.

The application of the overlay to a bar-stock thermowell may affect any number of critical attributes such as natural frequency, damping, material properties, or surface finish. These changes are difficult to account for in the calculations, therefore, there is risk that an inappropriately designed thermowell could be installed.

Document History

ASME PTC 19.3 TW
February 26, 2016
Thermowells Performance Test Codes
This Standard applies to thermowells machined from bar stock and includes those welded to or threaded into a flange as well as those welded into a process vessel or pipe with or without a weld...
March 1, 2012
Thermowells Performance Test Codes
The Scope of the work of Technical Committee No. 19 on Instruments and Apparatus is to describe the various types of instruments and methods of measurement likely to be prescribed in any of the ASME...
July 12, 2010
Thermowells Performance Test Codes
This Standard applies to thermowells machined from bar stock and includes those welded to or threaded into a flange as well as those welded into a process vessel or pipe with or without a weld...

References

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