Alloy 825 Solid Drilled Bar Stock, Thermowell, ASTM B564

Product Category: Thermowell, fabricated from solid drilled bar stock with tapered geometry
Material Grade: ASTM B564 UNS N08825 (Alloy 825), fully machined solid bar
Structure Design: Machined from solid drilled bar with tapered shape. The section at the flange base is thicker, gradually narrowing towards the tip. This design speeds up thermal feedback and lowers stress triggered by fluid flow
Insertion ("U") Length: 255 mm
Inner Bore Size: 6.6 mm, compatible with regular thermocouple and RTD probes
Process End Connection: 2 Inch, 300 LB Raised Face flange
Instrument Side Connection: 1/2 Inch NPTF
Surface Condition: Bright machined metallic finish. Smooth surfaces can be seen on both the tapered stem and flange sealing face

Key Benefits

1. Strong corrosion and high-temperature tolerance
Alloy 825 performs well against chloride stress corrosion cracking. It withstands both oxidizing and reducing working conditions, making it fit for sour operating environments and harsh process fluids.

2. Robust solid bar construction
The whole thermowell is processed out of one solid billet without any welding joints. It removes potential failure risks at weld seams and delivers better mechanical strength when facing high pressure and vibration from flowing media.

3. Optimized tapered geometry
The tapered form cuts down mass and flow drag near the tip to shorten temperature reaction time. Meanwhile, the thicker flange root retains sufficient strength at the location bearing maximum bending loads. Wake frequency validation follows ASME PTC 19.3 TW standards.

4. Universal flange connection
The 2-inch 300# RF flange matches ASME B16.5 standards, enabling simple mounting on standard pipes and pressure vessels.

Typical Applications

This thermowell fits high-pressure, high-temperature, and corrosive process fluid applications in oil and gas, petrochemical, and offshore facilities. It is widely adopted for sour service pipelines containing H2S and CO2, wellhead piping, and process vessels that demand stable temperature measurement with wake frequency assessment.