ASME B16.11 Coupling

ASME B16.11 Coupling is a common fitting in industrial pipeline connection. The coupling or socket is a nipple for connecting two pipes. Coupling is widely used in civil architecture, industry,agriculture and other fields since it is convenient. The main manufacturer standards also have GB/T14383,  and BS 3799.

There are two types of Coupling or socket, Socket Weld Coupling and Threaded Coupling. DN32 SW Coupling  A105 3000#, 3/4” SW Coupling A182 F22 CL3 and 3/4″ Half Coupling BSPP SS316,  2″ Forged Steel Coupling NPT Class 3000 A105.

Socket Weld Coupling or Socket

The ASME B16.11 Coupling socket weld is forged by round bar or ingot mold and then machined.  Put the pipe into socket hole and weld, that is socket weld connection. Therefore, its name is socket weld coupling or socket weld socket. The size is from DN6 (1/8”) to DN100 (4”) with pressure 3000lb, 6000lb and 9000lb.

Threaded Coupling or Socket

The ASME B16.11 Coupling threaded  is forging and has types of coupling NPT, socket BSPP, coupling BSPT. Both of their standard is ANSI/ASME B16.11、GB/T 14383.It has NPT and BSP( BSPP and BSPT). The size is from DN6 (1/8”) to DN100 (4”) with pressure 3000lb and 6000lb.

Both of them have two types, half and full coupling. For full couplings, there are equal and reducing coupling. And reducing couplings have Eccentric and Concentric.

The material is Carbon Steel, Alloy Steel and Stainless Steel. People also call them as Socket in some area or country. For example, Half Socket 1/2″ 3000lb BSPT A105, SS316 Socket 1″ BSPP 3000lb .or 1 1/2″ SS316L Coupling 3000lb NPT . The application of Socket is widely, including pipeline in different sizes, Pipe Tee, Cross Tee, etc and water meters and valves. Due to using socket structure, the pipeline joints reduce cost make installation, use, maintenance is extremely convenient, but also has a very high leak-proof ability.

Nominal Diameter		SW Coupling			Thread Coupling
		Approximate Weight (kg)			Approximate Weight (kg)
DN	NPS	3000	6000	9000	3000	6000
6	1/8	0.05	0.06	–	0.06	0.09
8	1/4	0.06	0.07	–	0.08	0.13
10	3/8	0.08	0.1	–	0.11	0.24
15	1/2	0.13	0.16	0.29	0.22	0.4
20	3/4	0.2	0.28	0.47	0.3	0.52
25	1	0.28	0.48	0.68	0.55	1.06
32	1 1/4	0.48	0.65	1.08	0.86	1.32
40	1 1/2	0.52	1.94	1.12	1.26	2.2
50	2	0.95	1.65	1.95	1.65	3.37
65	2 1/2	1.52	–	–	3	4.81
80	3	1.75	–	–	4.25	7.25
100	4	2.8	–	–	7.8	12