ISEN-TW series Thermowell

For industries where precise temperature measurement is critical, the integrity of the sensing instrument is paramount. Valvelink is proud to offer the ISEN-TW series Thermowell, a superior solution designed to protect temperature sensors in the most demanding process environments. Engineered for longevity and reliability, the ISEN-TW Thermowell is an essential component for ensuring operational safety and efficiency.

A Thermowell serves as a protective barrier for a temperature probe, isolating it from the potentially corrosive, high-pressure, and high-velocity process fluid. Unlike fabricated or tip-welded tubes, ISEN-TW thermowells are expertly crafted from solid bar stock of various heat and corrosion-resistant alloys. This construction method is preferred for critical applications, delivering superior mechanical strength and a longer service life.

Engineered for Peak Performance and Safety

The durability of a Thermowell depends on two key factors: proper material selection and robust design. The ISEN-TW series excels in both. By choosing the correct alloy, the Thermowell can withstand harsh corrosives, extreme temperatures, high pressures, and the mechanical stress and vibration induced by high-velocity fluids.

To guarantee the safest and most reliable performance, each ISEN Thermowell design is subjected to advanced analysis. Using a specially developed computer program, we perform automatic calculations of mechanical strength. This program estimates the effects of fluid pressure and flow velocity to predict the frequency of critical resonance, including Kármán’s Turbulence, ensuring the design is robust for the specified operating conditions.

Precision Manufacturing and Material Excellence

At the heart of the ISEN-TW Thermowell’s quality is a state-of-the-art manufacturing process. Each unit is produced using a genuine Two-Shaft Gun Drilling Machine, capable of drilling to a maximum depth of 2 meters, complemented by the latest NC Turning Machines for ultimate precision.

A Wide Range of High-Grade Materials:

Valvelink offers an extensive selection of standard alloy bar materials to match any application:

• Stainless Steel: 304, 321, 316, 347, 310, 446, 253MA (Low carbon types also available)
• Inconel: 600, 601, 625, X-750
• Incoloy: 800, 825
• Hastelloy: B, C276, X
• Other Alloys: Haynes 25, Carpenter 20Cb, Nichrome, Monel, Titanium, Tantalum, and more

Standard Dimensions:

ISEN-TW thermowells are available in various standard bore diameters and can be machined to depths of up to 1200 mm.

Bore Dia. (mm)	Max. Depth (mm)
4.0	500
5.5	700
7.0	800
8.5	1000
10.0, 11.0, 12.0, 16.0	1200

Versatile Models and Connection Types

The ISEN-TW series encompasses a wide variety of models to suit diverse installation requirements, including:

• Hexagonal Screwed-in (Tapered and Straight)
• Lagging Extension Types
• Heavy-Duty Types
• Flanged (Screwed-in and Welded)
• Weld-in and Van Stone Types

Specialized Flange Welding for Maximum Integrity:

For applications requiring flanged connections, we offer specialized welding options performed by certified technicians following ASME Boiler Code standards.

• Groove Welded Type: Ideal for lower-rating flanges, with grooves for fillet welding at the flange hole.
• Full Penetration Weld Type: This method provides excellent strength and perfect integrity against leaks, making it suitable for medium to high-pressure ratings. Post-weld heat treatment can be performed for stress relief.
• Threaded and Enlarged Neck Weld Type: A special design where the Thermowell’s neck is enlarged and positioned flush with the flange face. This shifts the weld outward to prevent fatigue from mechanical stress and vibration.

Rigorous Testing and Quality Inspections

To ensure every Thermowell meets the highest standards of quality and safety, a comprehensive suite of tests and inspections is available upon request:

• Pressure Test: Nitrogen gas pressure testing up to 10MPa.
• Hydrostatic Pressure Test: Internal pressure testing up to 40MPa.
• X-Ray Inspection: Conducted to verify uniformity in wall thickness, concentricity of the bore, and a smooth inner finish.
• Optional Tests: Helium Leak Test, Dye Penetrant Test, and material cross-checking with the Mill Certificate are also available.

For all your process control needs, trust Valvelink to provide the most durable and reliable ISEN-TW Thermowell solutions on the market. Our commitment to precision engineering, superior materials, and stringent quality control ensures your temperature measurement systems are protected, even in the most challenging industrial environments.

Contact Valvelink today to discuss your specific requirements. Special and custom Thermowell types are available upon request.

https://valvelink.asia/product/isen-tw-series-thermowell