abbreviations

• FCS - forged carbon steel

A Socket Weld, abbreviated as SW, pipe fitting is one where the pipe is inserted into a recessed area of the fitting. To make a socket weld fitting, the pipe is inserted into the pipe before it is welded. In order to prevent damage to the pipe and fitting, the pipe is then backed out a minimum of 1/16” to allow for thermal expansion of the pipe during the welding procedure. If this clearance is not made, the weld can crack due to the pipe expanding against the fitting.

Socket Weld Fitting Standards

ASME Standards

• ASME B16.11 - Forged Fittings, Socket-Welding and Threaded

Socket Weld Fitting sizes - 1/8" through 4"
	Cap - Round, ANSI Class 3000, FCS (in) Cap - Round, ANSI Class 6000, FCS (in)		Elbow - 90 Degree, ANSI Class 3000, FCS (in) Elbow - 90 Degree, ANSI Class 6000, FCS (in) Elbow - 90 Degree, ANSI Class 9000, FCS (in)
	Coupling - Full, ANSI Class 3000, FCS (in) Coupling - Full, ANSI Class 6000, FCS (in) Coupling - Full, ANSI Class 9000, FCS (in)		Lateral - ANSI Class 3000, FCS (in) Lateral - ANSI Class 6000, FCS (in) Lateral - ANSI Class 9000, FCS (in)
	Coupling - Half, ANSI Class 3000, FCS (in) Coupling - Half, ANSI Class 6000, FCS (in) Coupling - Half, ANSI Class 9000, FCS (in)		Reducer - ANSI Class 3000, FCS (in) Reducer - ANSI Class 6000, FCS (in) Reducer - ANSI Class 9000, FCS (in)
	Cross - Straight, ANSI Class 3000, FCS (in) Cross - Straight, ANSI Class 6000, FCS (in) Cross - Straight, ANSI Class 9000, FCS (in)		Tee - Straight, ANSI Class 3000, FCS (in) Tee - Straight, ANSI Class 6000, FCS (in) Tee - Straight, ANSI Class 9000, FCS (in)
	Elbow - 45 Degree, ANSI Class 3000, FCS (in) Elbow - 45 Degree, ANSI Class 6000, FCS (in) Elbow - 45 Degree, ANSI Class 9000, FCS (in)		Union - ANSI Class 3000, FCS (in) Union - ANSI Class 6000, FCS (in)