This standard specifies the types and dimensions of loose hubbed ductile iron pipe flanges with lapped pipe end whose nominal pressure PN is 2.0 or 5.0MPa.
2 Normative References
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. At time of publication, the editions indicated were valid. All the standards will be modified, and all parties using this standard shall discuss the possibility of using the latest version.
GB/T 17241.5-1998 The following standards are cited：
