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Thermowells

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Thermowells available in threaded, flanged, Van Stone or welded mounting styles come in a variety of materials to meet any temperature process requirements.
 
Industry Standard Mounting Styles ​
Wide variety including threaded, flanged, Van Stone and welded
 

Design Verification
Ensure safety with recommendations to verify thermowell design with our wake frequency calculations to ensure proper measurement.
 

Large Selection of Thermowell Materials
Including 316/316L Stainless Steel, 304/304L Stainless Steel, A105 Carbon Steel and more

 

Rosemount Thermowells

 

 

 

 

 

 

 

 

 

Mounting Styles

Consider process conditions and pipe or tank material to ensure the mounting style will be adequate for the application.

 

Threaded
• Connection: Threaded into process pipe or tank
• Easy installation and removal
• Lowest pressure rating of the mounting configuration options

 

 

 

Flanged
• Connection: Bolted to a mating flange on a process pipe or tank
• Manufacturing configurations: full and partial penetration welds
• Manufactured in accordance with ANSI B16.5
• Flange to stem weld is in accordance to ASME Section IX
• Full traceability with material certifications available on request

 

 

Van Stone
• Connection: Bolted to a mating flange on a process pipe or tank
• Unique design enables thermowell flange and stem materials to be different
• Eliminates weld-joint corrosion since there are no welds

 

 

 

Welded
• Connection: Permanently welded to a process pipe or tank
• Highest pressure rating and are generally used in applications with high velocity flow, high temperature, or extremely high pressure
• Leak-proof seal

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Stem Profile

 

 

 

 

 

The stem is the part of a thermowell inserted into the process piping or vessel. Factors to be considered when selecting a stem style include the process pressure, required response speed of the measurement, drag force of the fluid flow on the well, and the wake frequency.

 

Straight

• Diameter: Same along the entire immersion length
• Design: Strongest with largest profile to the process
• Drag: Highest compared to other styles with the same root diameter
• Response time: Slowest due to large tip diameter

 

 

 

Tapered
• Diameter: Uniformly decreases from root to tip
• Design: Medium. Good compromise between straight and stepped thermowells
• Drag: Medium. Less than straight style, but greater than stepped style
• Response time: Average. Faster than straight style, and slower than stepped style

 

 

 

Stepped
• Diameter: Two straight sections with the smaller diameter straight section at the tip
• Design: Least profile exposure to the flowing process
• Drag: Lowest of all styles
• Response time: Quickest due to the smaller tip

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