Are non-metallic expansion joints pressure pipe elements?
Yes, non-metallic expansion joints are considered one of the pressure pipe elements. According to the provisions of the Pressure Pipe Components Manufacturing License Items and Their Grades Table, non-metallic expansion joints belong to the category of "other non-metallic and non-metallic composite pressure pipe components", which includes pipes, pipe fittings, valves, bellows expansion joints, etc.
Non-metallic expansion joints, also known as non-metallic compensators, are usually made of fibrous fabric, rubber, or other non-metallic materials, and they are able to compensate for the deformation of the pipe system due to thermal expansion and contraction, vibration, displacement, etc. Such components are widely used in ventilation, dust removal, hot air and smoke duct systems because they not only provide necessary compensation functions, but also have good temperature resistance, corrosion resistance and sound absorption and shock absorption characteristics.
Since non-metallic expansion joints are an important part of pressure piping systems, their manufacture and installation also need to comply with relevant national and industry standards to ensure their safe and reliable operation. During design, manufacture, inspection and installation, these elements are required to comply with specific pressure piping element manufacturing licensing requirements to ensure the integrity and safety of the entire piping system.