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Warnings: 1. Do not mix Standard Service and Sour Gas Service Unions or parts.
2. Do not make up or break out Unions in pressurized lines.
3. Always use good safety practices, including use of safety glasses, when making up or breaking out Unions.
▲ Weld ends – Consult Factory. † Steel Forging Subs available – Consult Factory. TPI = Threads per inch. DI = Ductile Iron. SF = Steel Forging. BS = Bar Stock. ST = Steel Tubing.
Figure 400
Threaded Ends
Black Nut/Red Subs
Size Item Unit Weight A B C TPI Material
NPS Dn lbs kg in mm in mm in mm Nuts Subs
2 50
Union Complete 11.05 5.01
5.225 132.72 3.000 76.20 7.125 180.98 3STD SF SF
Nut 5.60 2.54
Male Sub 2.65 1.20
Female Sub 2.80 1.27
3 80
Union Complete 20.00 9.07
6.110 155.19 4.250 107.95 8.750 222.25 3STD SF SF
Nut 8.50 3.85
Male Sub 5.50 2.49
Female Sub 6.00 2.72
4 100
Union Complete 29.15 13.22
8.200 208.28 5.275 133.99 9.160 232.66 3STD SF SF
Nut 10.15 4.60
Male Sub 8.85 4.01
Female Sub 10.15 4.60
Ideal for manifold and pumping service. Available in threaded and butt weld ends.
Wing Unions
3,000 psi cwp – 4,500 psi test
4,000 psi cwp – 6,000 psi test
Figure 301
Steam Service Union
Black Nut/Green Subs
Size Item Unit Weight A B C TPI Material
NPS Dn lbs kg in mm in mm in mm Nuts Subs
1 25
Union Complete 1.75 0.79
2.670 67.82 1.640 41.66 4.065 103.38 6STD SF SF
Nut – –
Male Sub – –
Female Sub – –
Seal Ring – –
2 50
Union Complete 4.90 2.22
3.275 83.31 2.825 71.88 5.900 149.86 31⁄2
STD SF SF
Nut – –
Male Sub – –
Female Sub – –
Seal Ring – –
3 80
Union Complete 13.25 6.01
4.660 118.36 4.170 105.92 8.100 205.74 4STD SF SF
Nut – –
Male Sub – –
Female Sub – –
Seal Ring – –