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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 206
Buttweld Ends
Schedule 40
Blue Nut/Gray Subs
with Seal Ring
Size Item Unit Weight A B C+ D TPI Material
NPS Dn lbs kg in mm in mm in mm Nuts Subs
† 2 50
Union Complete 6.00 2.72
3.275 83.19 2.825 71.76 5.900 149.86 ▲ 4
STD DI DI
Nut 2.20 1.00
Male w/O-Ring 1.50 0.68
Female Sub 1.50 0.68
O-Ring – –
3 80
Union Complete 14.50 6.58
4.660 118.36 4.170 105.92 8.100 205.74 ▲ 4
STD DI SF
Nut 6.00 2.73
Male w/O-Ring 3.50 1.59
Female Sub 4.50 2.04
O-Ring – –
4 100
Union Complete 20.90 9.48
4.910 124.71 5.075 128.91 9.060 230.12 ▲ 3
MOD DI SF
Nut 7.40 3.36
Male w/O-Ring 6.18 2.80
Female Sub 7.38 3.35
O-Ring – –
6 150
Union Complete 45.00 20.41
6.610 167.89 7.410 188.21 12.800 325.12 ▲ 3
STD DI SF
Nut 18.18 8.26
Male w/O-Ring 13.00 5.90
Female Sub 14.00 6.35
O-Ring – –
O-Ring in male sub for improved sealing. Available in threaded and butt weld ends.
Figure 202
Blanking Cap Only
with O-Ring
Size Unit Weight Description
NPS Dn lbs kg
4 100 9.00 4.10 O-Ring seated dead-end cap.
Perfect for transport, completion and stimulation services.
Wing Unions
2,000 psi cwp – 3,000 psi test