This standard specifies pattern, dimension, material, marking, technical requirement and service provisions of bolting for use with steel pipe flanges (PN designated).
This Standard is applicable to HG/T 20592 Bolting for use with Steel Pipe Flange, including hex bolt, double end studs (clamping type), full thread stud and nut.
2. Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. For dated reference, subsequent amendments (excluding content of corrigenda) to, or revisions of, any of these publications do not apply. However, Parties to agreements based on this Code are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition of the normative document referred to applies.
"Fasteners--Ends of Parts with External Thread" GB/T 2
"The Technical Guide for High-temperature Bolt of Fossil-fired Power Plant" DL/T 439
3. Pattern, specification and dimension of bolting
3.0.1 Pattern of bolting
The pattern of bolting for steel pipe flange includes hexagon head bolt, double end studs (clamping type), full thread studs, hexagonal nut (style I) and hexagonal nut (style II).
3.0.2 Hexagon head bolt
1 The pattern and dimension of the hexagon head bolt shall comply with the requirements of GB/T 5782 (coarse thread) and GB/T 5785 (fine pitch thread), while the end of the hexagon head bolt shall be chamfered end, see Figure 3.0.2. The bolt end chamfer complies with the requirements of GB/T 2.
Contents 1. Scope 2. Normative references 3. Pattern, specification and dimension of bolting 4. Materials 5. Bolting service 6. Dimension tolerance 7. Surface treatment 8. Inspection 9. Acceptance, packaging and quality certificate 10. Marking and labeling Appendix A (Informative) Flap Gasket for Pipe Flange Bolting Appendix B (informative) Bolting and Bolting Insulation Parts for Insulating Flange
