Precision-Machined Thermowells: Protecting Temperature Sensors with Accuracy

In any process industry — whether it’s chemical, power generation, oil and gas, or water treatment — accurate temperature measurement is essential. Yet, harsh operating conditions often expose sensors to pressure, flow, and corrosive media.
That’s where thermowells come in.

A thermowell acts as a protective barrier between the process fluid and the temperature sensor, ensuring long sensor life, safer maintenance, and reliable readings without system shutdown.

What Is a Thermowell?

A thermowell is a machined metal component that houses temperature-sensing devices such as thermocouples, RTDs, or bimetallic thermometers. It isolates the sensor from direct process contact, allowing easy removal or replacement without disturbing the system pressure.

Thermowells are typically installed in pipelines, tanks, or reactors where durability, corrosion resistance, and accuracy are critical.

Types of Thermowells We Manufacture

At RPM Metal Industries, we specialize in custom-engineered thermowells manufactured from stainless steel and brass using high-precision CNC machining.
Our product range covers all major process connection types:

1. Screw-In (Threaded) Thermowell

• Ideal for general-purpose or low-pressure applications

• Easy installation and removal using standard threaded connections (NPT/BSP)

2. Flanged Thermowell

• Preferred in high-pressure or high-temperature environments

• Available in ANSI, DIN, and JIS flange standards

3. Socket Weld Thermowell

• Provides leak-proof performance

• Designed for permanent installations and vibration resistance

4. Weld-In Thermowell

• Fully welded to the pipeline for maximum strength and stability

• Common in applications requiring zero leakage or hygienic design

Each design can be supplied in tapered, straight, or stepped stem profiles, ensuring optimal response time and mechanical strength.

Materials and Standards

We manufacture thermowells using:

• Stainless Steel Grades: SS304, SS316, SS316L

• Brass: For moderate temperature and low-corrosion media

• Other alloys on request

All products adhere to ASME PTC 19.3 TW, DIN 43772, and customer-specific drawings or standards.

Why Choose a Custom Thermowell?

Every process is unique. A standard design may not always provide the best performance.
Custom-engineered thermowells offer:

• Accurate fit for your process dimensions

• Enhanced thermal response and reduced vibration stress

• Compatibility with existing sensor assemblies

• Longer service life in challenging conditions

At RPM Metal Industries, we work closely with customers to design thermowells that balance strength, accuracy, and ease of maintenance.

Applications

Our thermowells are widely used in:

• Oil & Gas Pipelines

• Chemical Processing Plants

• Power and Energy Systems

• Water & Wastewater Treatment

• Food and Pharmaceutical Equipment

Precision and protection go hand in hand.
A well-designed thermowell not only shields your temperature sensor but also ensures measurement consistency and process reliability.

At RPM Metal Industries, we combine CNC machining expertise, material precision, and quality control to deliver thermowells you can rely on — every time.