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5-Class Pressure Profile — ASME B16.5 Quick Reference
ASME B16.5 Group 2.2 (Austenitic Stainless: F304L, F316L, F317L). Approximate maximum allowable working pressure at 100°F (38°C) baseline.
| Pressure Class | Max WP at 100°F (approx.) | Equivalent (bar) | Typical Application |
|---|---|---|---|
| Class 150 | ~275 psi | ~19 bar | Low-pressure utility, cooling water, general process |
| Class 300 | ~720 psi | ~50 bar | General oil & gas process, standard chemical plant |
| Class 600 | ~1,440 psi | ~99 bar | High-pressure process, steam, compressor lines |
| Class 900 | ~2,160 psi | ~149 bar | High-pressure, high-temperature refinery service |
| Class 1500 | ~3,600 psi | ~248 bar | Very high pressure, wellhead, subsea lines |
| Class 2500 | ~6,000 psi | ~414 bar | Ultra-high pressure, specialty service |
Approximate reference values for Group 2.2. For verified P-T ratings across the full temperature range, consult ASME B16.5 Table 2-2.2. Ratings decrease substantially above 200°F (93°C). Duplex F51 uses a different material group with higher ambient-temperature ratings.
Class Selector — Enter your operating pressure
Carbon Steel vs. Austenitic Stainless — Class 150 / 300 Note
| Class | Group 1.1 Carbon Steel (A105) — 100°F | Group 2.2 Stainless (F316L) — 100°F |
|---|---|---|
| 150 | ~285 psi | ~275 psi |
| 300 | ~740 psi | ~720 psi |
Austenitic stainless Group 2.2 ratings at Classes 150 and 300 are marginally lower than carbon steel equivalents due to the lower ambient-temperature yield strength of austenitic grades (170 MPa minimum vs. ~250 MPa for A105). The crossover occurs at elevated temperatures, where stainless retains strength better.
EN 1092-1 PN to ASME Class — No Direct Mapping
| EN 1092-1 PN | Nearest ASME Class | Note |
|---|---|---|
| PN 20 | Class 150 | Similar pressure basis; EN PN ratings are at 20°C, ASME at 100°F |
| PN 50 | Class 300 | Approximate only — verify at service temperature |
| PN 110 | Class 600 | Approximate — design codes differ |
| PN 150 | Class 900 | Approximate |
| PN 260 | Class 1500 | Approximate |
| PN 420 | Class 2500 | Approximate |
PN and Class designations do not map 1:1. The pressure and temperature basis for each system differ. Synbase Steel can supply to either system and provide dimensional data for both on request. Contact Synbase Steel for project-specific guidance.
