1 Scope
This standard specifies types, dimensions, technical requirements and designation of steel pipe welding neck flanges in PN and Class designations for nominal pressure.
This standard is applicable to steel pipe welding neck flanges with nominal pressure PN 2.5~PN 400 and Class 150~Class 2500.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this standard.
GB/T 9112 "Types and Parameters for Steel Pipe Flanges"
GB/T 9124 "Specification for Steel Pipe Flanges"
3 Types and Dimensions
3.1 Types and dimensions of PN-designated steel pipe welding neck flanges
3.1.1 Sealing face types, applicable nominal pressure and nominal dimension scope of PN-designated steel pipe welding neck flanges shall be in accordance with those specified in Table 1.
Foreword I
1 Scope
2 Normative References
3 Types and Dimensions
4 Technical Requirements
5 Designation and Examples
