CSA Z245.12:25 ✓ Most Recent

Preface 

This is the tenth edition of CSA Z245.12, Steel flanges . It supersedes the previous editions published in 2021, 2017, 2013, 2009, 2005, 2001, 1996, 1991, and 1985. This Standard covers the requirements for steel flanges intended to be used for transporting fluids as specified in CSA Z662. The following are the major changes to this edition: a) clarification of Category II requirements; b) revised optional product ordering requirements; c) revised requirement for MPS (now mandatory); d) revised requirements for notch-toughness tests; e) revised requirements for elevated temperature service; f) revised requirements for material test reports; g) new requirements for record retention; h) revised tables for dimensions and tolerances of standard flanges; and i) revised requirements for hub designs. This Standard was prepared by the Subcommittee on Materials, under the jurisdiction of the Technical Committee on Petroleum and Natural Gas Industry Pipeline Systems and Materials and the Strategic Steering Committee on Liquid and Gaseous Energy Systems, and has been formally approved by the Technical Committee. 

Scope 

1.1 General 

This Standard covers wrought steel welding neck and blind flanges primarily intended for use in oil or gas pipeline systems. 

1.2 Size, grade, nominal pressure class, and category 

1.2.1 Size 

This Standard covers flanges in sizes from NPS 1/2 to NPS 60 (see Table A.1). 

1.2.2 Grade 

For other than sour service, this Standard covers flanges from Grade 248 to Grade 690. For sour service, this Standard covers flanges from Grade 248 to Grade 483. Note: The standard grades are Grades 248, 290, 317, 359, 386, 414, 448, 483, 550, 620, and 690 (see Table 4); however, intermediate grades may also be used. 

1.2.3 Nominal pressure class 

This Standard covers flanges having cold working-pressure ratings designated by nominal pressure classes from PN 20 to PN 420. The standard nominal pressure classes are shown in Table 1. Note: ASME class designations are shown in Table B.1. 

1.2.4 Category 

This Standard covers flanges in the following categories: a) Category I — flanges without requirements for proven notch-toughness properties; and b) Category II — flanges with requirements for proven notch-toughness properties. Note: A flange cannot be classified as Category II if it has not been notch-toughness tested. 

1.3 Assemblies 

This Standard does not cover assemblies. Note: An assembly is a grouping of fittings or flanges, or both, joined by one or more circumferential welds. 

1.4 Terminology 

In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.