CRN Certifications for Steel & O’Brien, Steel & O’Brien Canada, and Andron Stainless LTD have been consolidated under Steel & O’Brien. Steel & O’Brien parts that have been issued a CRN number are designed to operate at the attached pressures which comply with ASME B31.3 table 326.1 under the listed standard ASME BPE – the standard lists materials of construction, design pressures and temperatures, as well as dimensional requirements.
All Steel & O’Brien and Steel & O’Brien Canada certificates can be freely downloaded on this page.
For added security, all CRN fittings are etched with S&O or Steel & O’Brien.
“A” classified fittings
“B” classified flange fittings
“A” & “H” classified Heavy Duty and High Pressure Clamps are certified for:
- Working temperatures of ambient 70 °F to 200 °F Max
- With Max pressures listed as follows:
| Clamp Sizes | MAWP (PSI) |
| 0.5″ – 2″ | 350 |
| 2.5″ – 4″ | 245 |
| 6″ – 8″ | 175 |
