ASME B31T:2021 pdf free download

ASME B31T:2021 pdf free download.Standard Toughness Requirements for Piping.
3.7.1 Temperature Limits. Column 7 lists the minimum weld-permitted temperature. When a temperature is listed, this is the design minimum temperature permitted for welded construction for this T-number group. governing thickness, and notes regardless of impact testing or any other requirements. Use of the material Is prohibited at tempei’aturv colder than this temperature unless permitted by column 9.
Column 8 of Table 3.1-1 lists the design minimum temperature permitted For each T-number group without additional fabrication requirements. Alternatively, when stresses are limited to 30% of allowable, the temperatures in column 9 may be used instead of the values in column H.
When materials are used at temperatures colder than those listed in column 8 or column 9. as applicable, the welding, bending, and forming procedures shall be qualified to verify that they do not result in significant loss of material toughness. In addition, weld filler metal shall meet the impact test requirements of para. 3.7.4.
3.7.2 Welding Procedure Specifications
3.7.2.1 Generat. Welding procedures that are required by para. 3.7.1 to be qualified with impact testing shall be qualified for toughness, and the supplementary essential variables of ASME Boiler and Pressure Vessel Code (BPVC), Section IX shall apply. Temper bead welding procedures shall be prepared and qualified In accordance with Section IX using Impact testing as the basis for acceptance.
Impact tests of the weld metal and heat-affected zone (HAZ) shall be performed In accordance with paras. 3.72.2 and 3.7.2.3 except that impact tests of the HAZ are not required for
(a) the qualification For welds in P-Nos. I and 3 matenals that are postweld heat treated and are made by any process other than electroslag. electrogas, or thermit
(b) the qualification for weld deposit cladding or hard- facing on any base material
(c) that portion of the HAZ associated with gas tungsten arc welding (GTAWI root deposits with a maximum of two byers or 5 mm in.) thickness, whichever L5 less
3.7.22 Test Specimens. The weld procedure qualification impact test specimens shall be Charpy V-notch (CVN) specimens prepared and tested in accordance with the requirements in ASME HPVC, Section IX. A test shall consist of five specimens, all of which shall be tested at or below the design minimum temperature. The highest and lowest values of these specimens shall be disregarded, and the values of the three remaining specimens shall equal or exceed the impact value required for the base meta] to be welded in production. Alternatively.