ASME B16.5
Pipe Flanges and Flanged Fittings
ASME B16.5 defines dimensions, pressure-temperature ratings, materials, tolerances, marking and testing for pipe flanges and flanged fittings from NPS 1/2 through NPS 24.
What the standard covers
- Pressure classes 150 through 2500
- Flange types and facing dimensions
- Bolting and gasket interfaces
- Pressure-temperature ratings
What to state on your order
- NPS and pressure class
- Flange type
- Material grade and governing material standard
- Raised face, flat face or ring-joint facing
- Bore, schedule, finish and marking
Source basis
- Primary source: ASME B16.5 scope, dimensional framework and rating system, coordinated with the separately specified material standard such as ASTM A182/A182M.
Edition applicability
- This guide does not fix an edition. The piping class, code and purchase order must identify the applicable ASME revision and material-standard edition.
Technical content updated: 2026-07-29
Organizational author: Tsingshan (Shandong) Iron & Steel Co., Ltd..Review method, status and limitations.
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