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.
GB/T 19326-2003 The following standards are cited：
