Category
Materials, Welding & Coatings
Subcategory
Materials
Applicable standards
4
Issuing bodies
2
Description
Pressure-boundary bolting (A193 B7 / B16, A194 2H / 7).
Applicable Standards (4)
ASME — 2 standards
ASME B16.5
Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24
Flange dimensions, ratings, materials and tolerances for NPS 1/2–24, Class 150–2500.
Key requirements (8)
- Pipe flanges & flanged fittings for NPS 1/2 to 24.
- Pressure classes: 150, 300, 400, 600, 900, 1500, 2500.
- Class 150 CS: 285 psig at 100 °F, 200 psig at 400 °F.
- Class 300 CS: 740 psig at 100 °F, 555 psig at 700 °F.
- Flange types: weld neck, slip-on, socket weld, threaded, lap joint, blind.
- Facing types: raised face (RF), ring-type joint (RTJ), flat face (FF).
- Bore matching: weld neck bore selected to match pipe schedule.
- Hydrotest: per pressure class temperature/pressure rating chart.
ASME B16.34
Valves — Flanged, Threaded, and Welding End
Pressure-temperature ratings, dimensions, materials, NDE, marking and testing for valves.
Key requirements (7)
- Pressure–temperature ratings for valves (steel).
- Pressure classes: 150, 300, 400, 600, 900, 1500, 2500, 4500.
- Body wall thickness: t = (P·d)/(2·S·E − 1.2·P) + c, plus tabulated minimums.
- Hydrotest: shell at 1.5 × Class 100 °F rating; seat at 1.1 × Class 100 °F rating.
- Special class allows 25% above standard rating with stricter NDE (radiography + hardness).
- Materials per ASME II Part D allowable stress.
- End connections: threaded, flanged, butt-weld, socket-weld.
ASTM — 2 standards
ASTM A193 / A193M
Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service
Bolting materials (B7, B8, B8M, B16) for high-temperature/high-pressure service.
ASTM A194 / A194M
Carbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High Pressure or High Temperature Service
Nut grades (2H, 4, 7, 8, 8M) matched to A193 bolts.