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In the highly demanding chemical processing industry, equipment reliability and sealing integrity are critical for ensuring safe and efficient operations. Recently, the MT Portable Machine team completed another successful on-site machining project at a large chemical enterprise in Shandong, China. Using the MT FI26 Flange Facing Machine, our field engineers performed a precision repair of a damaged Ring Type Joint (RTJ) groove, restoring the flange sealing surface to its original design specification and preventing costly downtime for the client.

Understanding the Challenge: The Complexity of RTJ Groove Repair

RTJ flanges are widely used in high-pressure and high-temperature chemical processing lines. The RTJ groove—where the metal ring gasket is seated—is a critical sealing structure designed to withstand extreme operating conditions. Unlike standard raised-face or flat-face flanges, the RTJ groove has a narrow, deep, and precisely machined profile. Any deviation in groove angle, depth, width, or surface roughness can result in leakage, joint failure, or an inability to achieve the required bolt-up preload.

Repairing an RTJ groove on-site is a highly specialized task. It requires:

1. Exceptional machining accuracy

2. Stable equipment rigidity under heavy cutting loads

3. Precise control of groove geometry

4. Extensive field experience to handle variations in flange material, wall thickness, and installation conditions

In chemical plants—where flanges are often exposed to corrosion, erosion, vibration, and thermal cycling—RTJ groove wear is a common but technically demanding problem. Without immediate professional intervention, such defects can lead to shutdowns, process risks, and significant economic losses.

MT FI26 Flange Facing Machine: Precision, Stability, and Versatility

For this project, the MT Portable Machine team deployed the FI26 Flange Facing Machine, one of MT’s flagship portable machining solutions. Engineered for on-site flange repair, the FI26 features:

1. Rigid machining structure with high cutting stability

2. Wide diameter coverage suitable for various chemical plant flange sizes

3. Precision feed mechanism ensuring accurate groove geometry

4. Portable modular design for fast setup in restricted spaces

During the operation, our technicians executed precise measurements, aligned the equipment to micron-level accuracy, and restored the RTJ groove to match the original OEM specifications. The machining process delivered a clean, accurate sealing surface, ensuring the flange was ready for reassembly and safe restart.

Professional Expertise and Rapid Response from MT Portable Machine

The rapid mobilization and professional execution demonstrated MT Portable Machine’s strong capability in on-site machining across all types of flange sealing surfaces, including RTJ, RF, FF, and compact flanges. Our team’s rich field experience—combined with advanced equipment like the FI26—allows us to solve complex machining challenges quickly, reliably, and according to industry standards.

Contact MT for Technical Support and On-Site Solutions

If your facility faces flange damage, RTJ groove issues, or any other on-site machining challenge, the MT Portable Machine technical team is ready to assist. Contact us to get the latest product specifications, engineering support, and customized machining solutions for your project needs, info@mtportable.com

http://www.mtportable.com
​Jichuang Machinery Manufacturing Wuxi Co.,Ltd

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