ASTM B564 UNS N08825 Thermowell, Alloy 825, 6.6 MM

Product Type: Thermowell (Solid Drilled Bar - Stock, Tapered Design)
Material: ASTM B564 UNS N08825 (Alloy 825) - solid bar stock, fully machined
Construction: Solid drilled bar stock, tapered profile (thicker at flange root, tapering to a slimmer tip for faster thermal response and reduced flow-induced stress)
"U" Length (Insertion Length): 255 mm
Bore Diameter: 6.6 mm (sized for standard thermocouple/RTD sensor insertion)
Process Connection: 2 Inch - 300 LB RF (Raised Face) Flange
Instrument Connection: 1/2 Inch NPTF
Surface Finish: Machined bright metal finish, visible in the smooth tapered stem and flange face

Core Advantages

Corrosion & High-Temperature Resistance: Alloy 825 offers excellent resistance to chloride-ion stress-corrosion cracking, as well as resistance to both oxidizing and reducing environments — well suited to sour service and aggressive process media.

Solid Bar-Stock Integrity: Machined from a single solid billet (not welded), eliminating weld-seam failure points and giving superior mechanical strength under high pressure and flow-induced vibration.

Tapered Profile for Optimized Performance: The taper reduces mass and drag toward the tip, improving temperature response time while maintaining strength at the flange root where bending stress is highest — commonly verified per ASME PTC 19.3 TW wake-frequency calculations.

Standard Flange Interface: 2"-300# RF flange allows straightforward installation into standard ASME B16.5 piping/vessel connections.

Applications

Suited for high-pressure, high-temperature, and corrosive process streams in oil & gas, petrochemical, and offshore platforms — particularly sour service (H2S/CO2) lines, wellhead piping, and process vessels where reliable, wake-frequency-verified temperature sensing is required.