ASME B16.25-2017 free download

10-01-2020 comment

ASME B16.25-2017 free download.Buttwelding Ends.The site of this pdf file is 6.88M.
ASME B16.25-2017 covers the preparation of buttwelding ends of piping components to be joined into a piping system by welding. It includes requirements for welding bevels, for external and internal shaping of heavy-wall components, and for preparation of internal ends (including dimensions and tolerances). Coverage includes preparation for joints with the following: no backing rings; split or noncontinuous backing rings; solid or continuous backing rings; consumable insert rings; gas tungsten arc welding (GTAW) of the root pass.
ASME B16.25-2017 applies to any metallic materials for which a welding procedure can be satisfactorily qualified but does not prescribe specific welding processes or procedures. Unless otherwise specified by the purchaser, it does not apply to welding ends conforming to ASME B16.5,B16.9,or B16.4.
This Standard states values in both SI (Metric)and U.S Customary units. These systems of units are to be regarded separately as standard. Within the text, the
U.S. Customary units are shown in parentheses or in separate table that appears in Mandatory Appendix 1.
The values stated in each system are not exact equivalents; therefore, it is required that each system of units be used independently of the other. Combining values from the two systems constitutes nonconformance with the Standard.
1. 4 Size
Nominal pipe size (NPS), followed by a dimensionless number, is the designation for nominal fitting size. NPS is related to the reference nominal diameter DN)used in international standards.

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