The roundness of the eccentric pipe should not exceed 1% of the corresponding outer diameter at the ends, and the allowable deviation is ±3mm. The material of the eccentric pipe conforms to SY/T5037, GB/T9711, GB/T8163, ASTM A106/A53 GRB, API 5L, APT5CT, ASTM A105, ASTM A234, ASTM A106, DIN German standards, and customer-specified standards.

Diameter Reducing Fittings (Reducers) are pipe fittings used for transitions in pipe sizes. Typically, forming processes like reduction extrusion, expansion extrusion, or a combination of both are employed. For certain sizes of reducers, stamping forming can also be used.