1 Scope
This standard specifies the structural type and dimension series of welding neck flange for steel pressure vessels.
This standard is applicable to welding neck flange for steel pressure vessels with nominal pressure between 0.6~6.4MPa and working temperature beyond -70~450℃.
This standard also applies where the corrosion allowance is less than or equal to 3mm.
2 Normative References
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies. For undated references, the latest edition (including all the amendments) of the normative document applies.
NB/T 47020 Type and Specification for Pressure Vessel Flanges
Foreword I
1 Scope 1
2 Normative References 1
3 Structural Type and Dimension 1
4 Selection Requirements 1
