4-1-1 indicates the support plane, which is an imaginary extension of the supporting-struc- ture surface that passes through the shank of the ther- mowell. Use of ball joints, spherical unions, or packing gland installations are not permissible in Performance Test Code applications. The selection of a specifc attachment method is subject to the governing piping or pressure vessel code. These fgures are representa- tive of common practice but do not display all allowable attachment confgurations. Typical thermowell attachment confgurations include threaded, socket weld, weld-in, lap-joint (Van Stone), and integral-fanged as shown in Figs. 4-1 CONFIGURATIONS Figure 4-1-1 shows a schematic diagram of a ther- mowell, along with its characteristic dimensions.

Question: Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation. Edition: Cite the applicable edition of the Code for which the interpretation is being requested. It is further recommended that the inquirer sub- mit his request in the following format: Subject: Cite the applicable paragraph number(s) and a concise description. The request for interpretation should be clear and unambiguous.

Interpretations can be rendered only in response to a written request sent to the Secretary of the PTC Standards Committee.

Upon request, the PTC Standards Committee will render an interpretation of any requirement of the Code. Requests for Cases should also indicate the applicable edition of the Code to which the proposed Case applies. The request should identify the Code, paragraph, figure or table number(s), and be written as a Question and Reply in the same format as exist- ing Cases. Request for cases shall provide a Statement of Need and background information. Cases are effective immediately upon ASME approval and shall be posted on the ASME Committee Web page. Cases may be issued for the purpose of providing alternative rules when justified, to permit early implementation of an approved revision when the need is urgent, or to provide rules not covered by existing provisions. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. The Committee welcomes proposals for revisions to this Code. Approved revisions will be published periodically. Revisions are made periodically to the Code to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Code. ASME PTC 19.3 TW-2010 pdf download.Thermowells.

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