... form: Longitudinal 2)Technology: ERW 3)Application: Fluid Quality standard: API 5L Gas and petroleum pipelines GB/T9711 Petroleum and natural ... , St13, St14, St33,St37, St44, ST52ASTM A 53: Gr. A, Gr B, Gr C, Gr.DAPI 5L: A, B, X42, X46, X52, X56 ... the relevant stanards.Spherical socket joint: provides the possibility of a rotation 10 degrees at the pipeline without the utilization of ...