ASME B16.5 vs B16.47: Sizes, Series and Ordering

B16.5 scope

ASME B16.5 covers NPS 1/2 through NPS 24 within its specified classes and component coverage. Class 2500 coverage is limited to NPS 1/2 through NPS 12. Consult the ordered edition for all limits.

B16.47 scope

ASME B16.47 covers large-diameter steel flanges NPS 26 through NPS 60. Specify Series A or Series B and check the permitted type, class and material requirements in the ordered edition.

Series is a connection detail

Do not assume Series A and Series B flanges of the same NPS and class will mate. Compare actual OD, thickness, bolt-circle diameter, hole number/diameter and facing details.

Class is not a fixed pressure value

Class 150 does not mean a universal 150 psi working pressure. Pressure–temperature ratings depend on material group, temperature and the governing standard. PN is also not a direct substitution rule for ASME class.

Build a complete flange enquiry.

Choose the connection and add your project details. No entry here confirms a pressure rating, material substitution or engineering approval.

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