(FC type is further divided into FC/FC and FC/PC (APC) type. The former FC is the abbreviation of FerruleConnector, indicating that its external reinforcement is made of metal sleeves, and the fastening method is turnbuckle; the latter FC indicates the docking method of the joint. For plane butt, PC is the abbreviation of PhysicalConnection, indicating that the butt end face is in physical contact, that is, the end face has a convex arch structure, APC is similar to PC, but a special grinding method is used, PC is spherical, APC is inclined 8-degree spherical surface, Indicators are better than PC.)
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