Bellows, as flexible connectors, are widely used in piping systems, automotive manufacturing, aerospace, and industrial equipment. Their performance directly impacts system safety and reliability. To ensure product quality, countries have established strict implementation standards governing the design, materials, manufacturing, and testing requirements for bellows.
In China, the main implementation standards for bellows include GB/T 14525-2010, "General Technical Requirements for Corrugated Metal Hoses," and GB/T 12777-2019, "General Technical Requirements for Metal Bellows Expansion Joints." The former applies to corrugated metal hoses for general industrial use and specifies key performance indicators such as pressure resistance, flexibility, and fatigue life. The latter focuses on expansion joints, emphasizing performance requirements for thermal compensation, vibration damping, and displacement compensation. Furthermore, standards such as HG/T 20592-2017, "Steel Pipe Flanges, Gaskets, and Fasteners," also address the use of bellows connectors.
Internationally, ISO 10380:2012 (Corrugated Metal Hose) and ASME B31.3 (Process Piping Code) are widely recognized standards. The ISO standard focuses on durability testing for bellows, such as pressure cycling and flex fatigue. The ASME standard, integrated into the American Society of Mechanical Engineers' piping design specifications, ensures the suitability of bellows for high-temperature and high-pressure environments. The European market generally adheres to EN 10311:2002 (Metal Bellows), which sets clear requirements for material composition, welding processes, and sealing.
Strict implementation of these standards not only ensures the consistent quality of bellows but also provides a reliable basis for engineering applications. Manufacturers must adhere to these standards in material selection, structural design, and factory inspection. Users should select bellows that meet these standards based on their specific operating conditions to ensure long-term, safe operation of their systems. With advances in materials science and engineering technology, bellows standards will continue to be optimized to meet increasingly stringent application requirements.
