All

All
Product
News
FAQ
Video Demo

This is placeholder text.

Your inquiry cart is empty. Go add products now!

News

Stay up to date with the latest news, industry insights, and technical updates from Forante.

全部分类 



Company News

Industry Insights

Technical Articles

Home

2026

08-17

Why Press-Fit Connections Are Ideal for Stainless Steel Piping

Franta's press-fit connection technology is based on mature German SPP technology with more than 60 years of application experience in Europe and the Americas. By combining a 360° O-ring sealing structure with mechanical pressing, the system creates a high-pressure sealing zone and provides reliable, efficient connections for stainless steel compressed air piping systems.

Author:

Franta

Views:

An Often-Underestimated Risk

　　In compressed air piping systems, connection points are among the most vulnerable components.

　　An air compressor room is far from a quiet environment. Compressor operation, pressure fluctuations during system start-up and shutdown, and pulsating airflow all generate continuous low-frequency vibration. While this vibration is not as intense as an earthquake, it is transmitted to every piping connection day after day and year after year.

　　Many people assume that “once a connection is properly installed, the problem is solved.” Yet under continuous vibration, connections are precisely where problems are most likely to occur. The real question is not whether a failure will occur, but when it may begin.

　　According to industrial equipment maintenance data, approximately 60% of compressed air system failures are related to sealing failures at piping connections. The losses caused by compressed air leakage go far beyond the sound of a simple “hiss” —

　　· Energy loss: Compressed air leakage means wasted electrical energy

　　· Increased pressure drop: The more leakage points a system has, the less stable the system pressure becomes

　　· Downtime costs: Leak inspection and repair may require production shutdowns, making every minute costly

　　In this article, we examine why press-fit connections can be a more suitable solution for compressed air piping systems from the perspective of connection technology.

Limitations of Traditional Connection Methods

　　Welding is one of the most widely used traditional connection methods for industrial piping. It provides strong, durable joints and good sealing performance. However, when used with thin-wall stainless steel piping, welding can involve demanding on-site installation, strict weld protection requirements, and high dependence on operator skill. If shielding gas protection is insufficient during welding, the back side of the weld may oxidize, forming a brittle oxide layer that can affect corrosion resistance and mechanical performance, potentially becoming a source of leakage or failure.

　　Threaded connections are another common connection method, especially for small-diameter galvanized steel pipes. Sealing depends on PTFE tape or sealant filling the gaps between threads. In stainless steel piping, however, thread machining can damage the passive layer on the pipe surface, while sealing materials may shrink or loosen as they age, limiting long-term reliability.

　　So, when welding is inconvenient and the sealing limitations of threaded connections need to be avoided, is there a better alternative? Press-fit technology was developed precisely to address these requirements for thin-wall stainless steel piping.

How Press-Fit Connections Work: German Technology Proven for 60 Years

　　Franta's press-fit connection technology is based on mature German SPP technology, which has been used in developed markets across Europe and the Americas for more than 60 years, providing extensive practical validation of press-fit connection reliability.

　　The principle behind press-fit connections is straightforward. An O-ring seal is installed in a 360° U-shaped groove at the end of the fitting. During installation, the stainless steel pipe is inserted into the fitting, and a dedicated press tool applies controlled mechanical force to the fitting. The pipe and fitting ends are compressed together around the O-ring, creating a high-pressure sealing zone.

　　Mechanical locking + elastic sealing = dual protection. This is the core principle of press-fit connections.

　　Unlike welding and threaded connections, press-fit connections do not depend on high-temperature fusion or sealing materials to fill thread gaps. Once the press operation is completed, the joint is mechanically secured, without creating a heat-affected zone that could damage the material properties of the stainless steel.

Why Press-Fit Connections Perform Better Under Vibration

　　In the continuous vibration environment of an air compressor room, press-fit connections can provide strong reliability compared with traditional connection methods. According to Franta product test data, press-fit connection products have undergone one million vibration cycles, demonstrating strong vibration resistance and service life. Their advantages can be summarized in four areas:

　　Advantage 1: Integrated Seal Design for Uniform 360° Sealing

　　The fitting incorporates a dedicated sealing groove with a pre-installed high-quality O-ring. Assembly is straightforward and easy to verify. The annular groove and sealing ring are precisely matched, and after pressing, they form a 360° sealing zone with controlled compression for uniform sealing without dead spots.

　　Advantage 2: Anti-Rotation Design Helps Prevent Leakage

　　The six-sided pressing structure tightly locks the pipe and fitting together. Even when the joint is subjected to external torsional forces, the connection is designed to resist loosening and leakage, helping maintain long-term system reliability.

　　Advantage 3: Flexible Adaptation to Vibration and Movement

　　The connection structure allows the piping assembly to accommodate controlled expansion and displacement. The pressed joint provides stable support while allowing the stainless steel material to utilize its inherent toughness, helping improve piping system safety during operation.

　　Advantage 4: Standardized Installation Quality

　　Press-fit installation quality does not rely solely on the operator's hand feel. When dedicated press tools are used correctly, the connection process is highly repeatable. An experienced installer and a new installer using the same press tool can achieve consistent connection quality. A single fitting can typically be pressed within seconds, making installation highly efficient.

Franta’s Approach

　　Since introducing mature German technology in 2004, Franta has focused on developing multiple stainless steel pipe connection methods, including press-fit, welded, and flanged connections, building more than 20 years of expertise in stainless steel piping systems.

　　Supported by strong in-house mold development capabilities, Franta develops high-precision molds and uses FKM and NBR sealing rings to support long sealing life, dimensional consistency, and reliable product performance throughout the service life of the piping system.

　　Today, Franta stainless steel piping systems are widely used for compressed air distribution, recirculating cooling water, roof rainwater drainage, drainage, and other industrial applications, as well as commercial real estate, residential real estate, public buildings, municipal water supply, gas transmission, and other sectors. More than 10,000 projects have been completed using Franta stainless steel piping systems.

　　Franta has participated 28 times in the drafting and compilation of national and industry standards, continuing to promote technical advancement and standardized development in the stainless steel piping industry.

　　The company holds authoritative German DVGW certification for gas and drinking water applications, has been recognized as a High-Tech Enterprise and a Specialized and Innovative Enterprise, and holds a special equipment production license for pressure piping components.

　　What we provide is more than piping. We provide a complete compressed air piping system solution — from system planning and design to installation, testing, and commissioning, every stage is implemented to high standards.

Respecting Commitment, Honoring Service

Why Stainless Steel Is the Preferred Choice for Industrial Gas Piping