ASME T31 pdf free download

ASME B31T-2015 pdf free download.Standard Toughness Requirements for Piping ASME Code for Pressure Piping, B31.
Low-temperature service requirements are contained in Table 3.1-I. These requirements are established (or T-number groups of materials with similar requirements. In addition to T-numbrr group, in some cases ft1uirements are dependent on thickness and/or other characteristics as l$trd in Table 3.1-1.
3.2 MaterIal Groupings (Column I of Table 3.1-1)
Material T-number groups (or each cosrnd material specification are provided in Table 32-1. (In addition, a table sorted by material tvpL and T-number group that lists all materials in each T-number group is provided in Mandatory Appendix Ill.) In determining the applicable T-number group for a material (mm the table, consideration shall be given to the material specIficatIon. grade. and any other variables as established in the notes The table separates the materials ioto types (carbore steel. low-alloy steel. etc.), and the group number is representative of the low-temperature service limit for the material; however, the low-temperature service limit may vary bawd on the design and fabrication requirements. Low-temperature service limits shall be determined from Table 3.1-1. An ‘(A) in the T-number group e.g.. CS —20(Afl indicates that materials of that group may not be used at temperatures colder than the
group number leg.. —29C (-)°F)I.
3.3 NomInal Thickness and Notes (Columns 2 and 3 of Table 3.1-1)
For material T-number groups where the low- temperature suitability vanes significantly according to the thickness, a thickness is listed in column 2 of Table 3.1-1. Note that the thickness is the nominal thickness as defined In the cede or specification referencing this Cede. The variation based on thickness applies to carbon steel T-numbcr groups CS A. CS B, CS C, and CS D where Table 3.1-1 lists thickness at each 10°F inctement. When it is desired to refine the influence of the thickness, Mandator Appendix I provides the continuous curses and tables that can be used at intermediate values or greater thickness. Since the nominal thicknesses in Table I-) of Mandatory Appendix I ore generally derived based on uniform increments of temperature. the table does not contain uniform increments of thickness. Again, the Continuous curves in Mandatory Appendix I should be consulted for the precise values
For material T-numbcr groups where the low.
temperature suitability is dependent on sonic other factor. those factors are given in thc notes listed in column 3 of Table 3.1-I.
3.4 Low-Temperature Service Limit (Column 4 of Table 3.1-1)
Column 4, the first temperature column in Table 3.1-1, is the low-temperature service limit. If the design minimum temperature is equal to or warmer than this value, then low-temperature requirements do not apply. Matenails within a group may be used at this temperature or temperatures warmer than this limit without imposing any of the requirements of this Code. This limit considers material properties and the influence of fabrication processes on the material properties.
3.5 MaterIal Requirements for Low-Temperature Service (Columns S and 6 of Table 3.1-1)
Column S lists the minimum permitted temperature of the material. When a temperature is listed, this is the design minimum temperature permitted for the material group regardless of impact testing or any other requirements except as permitted by column 18. where the applied stress is limited to 30% of the allowable,
Column 6 is the minimum temperature without impact testing for the material. If the design minimum temperature is equal to or warmer than this value, the material dues not require impact testing. If the design minimum temperature is colder than this value, impact testing of the material in accordance with section 3 is required. For carbon steels, this limit might vary with material thickness (T-number groups CS A, CS B. CS C, and CS D) or with stress levels. Additional rows are provided in the table for thickness variations. lnterpolahon betWeen thicknesses is permitted. Figures and a table for the curves of the variation of temperature with thickness are provided in Mandatory Appendix I and these may be used as an alternative in Table 3.1-1. Permitted temperatures with stress limit’s an’ pnwided for by using columns 10 through 1$ instead of column 6 as discussed in para. 3.6 below.ASME B31T pdf download.