Inconel Sample Probe Assemblies (600 / 625 / 718)
Inconel 600, 625, and 718 sample probe assemblies for high-temperature, sour service, and hydrogen environments. NACE MR0175 / B31.12 compliant. Configurable for refinery, petrochemical, and hydrogen economy service.
When to Specify an Inconel Probe
Inconel alloys are the workhorse choice for high-temperature, hydrogen-bearing, and sour gas sample probe service. The three most common grades:
- Inconel 600 — best for dry oxidizing service above 600 °C
- Inconel 625 — best all-rounder for high-temperature sour service and hydrogen
- Inconel 718 — high-strength bolting; restricted use in sour service when age-hardened
For a direct comparison with Hastelloy C276, see Hastelloy C276 vs Inconel 625.
Standard Configurations
| Parameter | Range |
| OD | 0.250" - 1.500" |
| Wall thickness | 0.035" - 0.165" |
| Length (L) | 4" - 120" |
| Grades | 600, 625, 718 |
| Heat treatment | Solution-annealed for sour service |
| Connection | NPT, BSP, flanged, hub, welded |
| Compliance | NACE MR0175, ASME B31.12, ASME B31.3 |
Hydrogen Service
For high-pressure hydrogen sampling, Inconel 625 (annealed) is the preferred material above 3000 psig. The wall thickness is sized using the Barlow's hoop-stress equation with the ASME B31.12 hydrogen material performance factor applied to the allowable stress.
High-Temperature Service
Above 1000 °F, Inconel 625 retains useful mechanical properties where 316L is essentially decorative. The configurator accepts process temperatures up to 1500 °F with Inconel 625 selected and tunes the allowable stress accordingly.
Configure
Open the SPA Configurator, select Inconel 625, and enter your process conditions. The wizard validates pressure (Barlow + B31.12 derating), temperature (allowable-stress lookup), velocity (wake frequency), and chemistry (NACE MR0175) before generating the model number.