This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of metal corrugated expansion joints with flange connection dimensions according to GB569 and GB2501. This standard is applicable to ship piping systems such as sea water, ballast, fire protection, oil, and steam with temperatures not exceeding 200°C. It is used as a compensation device for thermal expansion and contraction of pipelines and pipeline displacement due to hull deformation. It can also be applied to fans. , high-frequency low-amplitude vibration situations in piping systems such as pumps.