EN 1092 vs ASME B16.5 — Matching Valve Flanges to Pipe
EN 1092 (PN) and ASME B16.5 (Class) flange systems are not dimensionally interchangeable. The valve end standard must follow the pipe flange standard on the isometric.
Quick selection
EN / many water projects: EN 1092 PN. US / ASME piping: B16.5 Class. See PN16 vs Class 150.
Comparison table
| Factor | EN 1092 (PN) | ASME B16.5 (Class) |
|---|---|---|
| Pressure label | PN10, PN16, PN25, PN40… | Class 150, 300, 600… |
| Common regions | EN / ISO piping, EU/ME water | ASME B31, US/Gulf process |
| Dimensions | EN flange tables | B16.5 tables |
| Valve wording | “Flanged EN 1092-2 PN16” | “Flanged ASME B16.5 Class 150 RF” |
| Buyer action | Match PN to pipe | Match Class + facing to pipe |
RFQ checklist
Always name flange standard, PN or Class, facing, and size.
- DI waterworks often EN 1092-2.
- WCB process valves often B16.5.
RFQ wording that works
- “Butterfly DN200, wafer, to suit EN 1092-2 PN16 flanges.”
- “Gate 6 inch, ASME B16.5 Class 300 RF, WCB.”
FAQ
Are PN16 and Class 150 the same flange?
No. Bolt circles differ.
Can adapters fix a mismatch?
Only with engineered spools — not a silent substitution.
Where does B16.47 fit?
Large diameter ASME flanges (NPS 26+).
FF vs RF?
Flat face vs raised face — see raised-face vs flat-face guide.
Related RFQs and hubs
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Include size, pressure class or PN, ends, MOC, quantity, and destination. We return a techno-commercial offer from Ahmedabad.