GB/T 19326-2003 in English

《GB/T 19326-2003钢制承插焊、螺纹和对焊支管座》由604-1（中国机械工业联合会）归口，主管部门为中国机械工业联合会。
本标准规定了与主管轴向成90°连接的异径整体加强式钢制承插焊、螺纹和对焊支管座的壁厚等级、尺寸公差、材料、设计、制造、检验和试验及标志等要求。本标准适用于主、支管为异径连接的石油、化工、电力等行业配管用钢制支管座。

1 Scope

This standard specifies wall thickness class, dimensional tolerance, materials, design, manufacture, inspection and test and marking requirements for reducing integrally reinforced forged branch outlet fittings-socket welding, threaded and butt-welding ends which are connected with the main pipe axle at 90 °.
This standard is applicable to forged branch outlet fittings for petroleum, chemical industry and electric power which are connected in different diameters of the main pipe and branch pipe.

2 Normative References

The following documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.

Foreword I
1 Scope
2 Normative References
3 Symbols
4 Wall Thickness Class
5 Dimension and Tolerance
6 Materials
7 Design and Manufacture
8 Test
9 Inspection
10 Marking
11 Surface Treatment and Packing
Appendix A (Informative) External Diameter and Wall Thickness of Connection Pipes
Appendix B (Informative) Relevant Dimensions of Branch Outlet Fittings - Socket Welding and Threaded
Appendix C (Normative) Design Verification Test
Appendix D (Normative) Space at Joint of Branch Outlet Fittings and Main Pipe