A flange can be considered both a primary and secondary material, depending primarily on the specific application and project requirements.
By definition, a flange is a connecting component typically used to connect pipes, valves, pumps, and other equipment, serving a fixing and sealing function. In piping systems, flanges are crucial components connecting various pipe sections, and their importance is self-evident. In large projects such as petrochemical, power, and shipbuilding, flanges are often considered primary materials due to their crucial role in the piping system. This is because these projects have extremely high requirements for the safety and reliability of the piping system, and the quality and performance of the flanges directly affect the overall system's operation and lifespan. Therefore, in these projects, the selection, procurement, and installation of flanges require rigorous review and control to ensure they meet project requirements.
However, in smaller projects or maintenance work, flanges may be more often considered secondary materials. This is because the requirements for the piping system in these projects are relatively lower, and the flange's role is mainly to assist in connection and sealing, rather than bearing the primary load or transmission function. In such cases, flange selection can be more flexible and diverse, allowing for selection and procurement based on actual needs.
From a technical principle and application perspective, the material, specifications, and sealing method of a flange all affect its classification. For example, flanges used in high-temperature, high-pressure, or corrosive media environments often require special materials and sealing methods to ensure their safety and reliability. These flanges are often considered primary materials in projects because they play a crucial role in the successful operation of the project. Flanges used in some conventional environments, such as those in ordinary water piping systems, may be more often considered secondary materials.
Furthermore, industry standards are also an important basis for determining whether a flange is a primary or secondary material. Different industries may have different classifications and requirements for flanges. For example, in the shipbuilding industry, flanges, as an important component of the ship's through-hull plate, are often considered one of the primary materials. In some other industries, flanges may be more often considered secondary materials or standard parts.
