This standard specifies the types and dimensions of the hubbed slip-on-welding and hubbed socket welding ductile cast iron flanges whose nominal pressure PN is 1.0, 1.6, 2.0, 2.5 and 4.0MPa.
2 Normative References
The provisions of the following standard, through reference in this standard, constitute the provisions of this standard. At the time of publication, all editions indicated are valid. All standards are subject to revision, and parties to agreements based on this code are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
Specifications for Cast Iron Pipe Flanges (GB/T 17241.7-1998)
GB/T 17241.4-1998 The following standards are cited：
GB/T 17241.4-1998 Cited by the following standards：
