MSS SP-83 Class 3000 and 6000 Pipe Unions
Detachable / Three-Part Structure / Sealing / Diverse Materials
High Quality Socket Welding and Threaded Pipe Unions
SSM provides pipe unions as a type of connector in pipeline systems, designed to conveniently connect or disconnect two sections of piping. Unlike welding or threaded connections, pipe unions enable disassembly and maintenance without cutting the pipes, making them ideal for scenarios that require frequent disassembly or replacement.
MSS SP-83 Pipe Unions Advantages
Flexibility: Easy to disassemble and reassemble.
Time-Saving: Reduces maintenance and installation time.
Reusability: Can be disassembled and reassembled multiple times.
MSS SP-83 Pipe Unions Types
Class 3000 Pipe Unions-Socket Welding Ends
- Pressure Rating: Class 3000.
- Size: 1/8-3″
- Connection Method: Socket Welding.
- Applications: Medium-pressure pipeline systems requiring high sealing and strength.
- Materials: Carbon Steel, Alloy Steel, Stainless Steels, and Nickel Alloys
Class 3000 Pipe Unions-Threaded Ends
- Pressure Rating: Class 3000.
- Size: 1/8-2 1/2″
- Connection Method: Threaded.
- Applications: Medium-pressure pipeline systems requiring easy disassembly and maintenance.
- Materials: Carbon Steel, Alloy Steel, Stainless Steels, and Nickel Alloys
Class 6000 Pipe Unions-Socket Welding Ends
- Pressure Rating: Class 6000.
- Size: 1/8-3″
- Connection Method: Socket Welding.
- Applications: High-pressure, high-temperature, or high-vibration pipeline systems.
- Materials: Carbon Steel, Alloy Steel, Stainless Steels, and Nickel Alloys
Class 6000 Pipe Unions-Threaded Ends
- Pressure Rating: Class 6000.
- Size: 1/8-3″
- Connection Method: Threaded.
- Applications: High-pressure pipeline systems requiring easy disassembly and maintenance.
- Materials: Carbon Steel, Alloy Steel, Stainless Steels, and Nickel Alloys
MSS SP-83 Pipe Unions Materials
| Material | Grades |
| Carbon Steel | A105, A350 LF2, A234 WPC, A420 WPL6 |
| Alloy Steel | A182 F1, A182 F5, A182 F5A, A182 F9, A182 F11 CL2, A182 F22 CL3, A234 WP5, A234 WP22 CL2, A234 WP22 CL3, A234 WP91 |
| Stainless Steels | A182 F304, A182 F304L, A182 F304H, A182 F316, A182 F316L, A182 F316H, A182 F317, A182 F317L, A182 F321, A182 F321H, A182 F347, A182 F347H, A182 F44, A182 F51, A182 F53, A182 F55, A403 WP304, A403 WP304L, A403 WP304H, A403 WP316, A403 WP316L, A403 WP316H, A403 WP317, A403 WP321, A403 WP321H, A403 WP317L, A403 WP347, A403 WP347H, A403 WPS31254 |
| Nickel Alloys | B564 UNS N04400, B564 UNS N10276, B462 UNS N08020 |
MSS SP-83 Pipe Unions Applications
- Oil and Gas Industry: Used for connecting high-pressure pipeline systems.
- Chemical Industry: Used for corrosive media or high-temperature, high-pressure environments.
- Power Industry: Used for steam or cooling water pipeline systems.
- General Industry: Used for pipeline systems requiring frequent maintenance or replacement.
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More Information About MSS SP-83 Pipe Unions
This Standard Practice contains envelope and other essential dimensions,finish,tolerances,testing, marking,material,and minimum performance requirements for forged carbon steel,alloy steel,stainless steel,and nickel alloy pipe unions,socket welding and threaded ends.
MSS SP-83 Pipe Unions Dimensions
| NPS | Pipe End (min.) | Socket Bore Dia. | Socket Wall (min.) | Water Way Bore (a) | Laying Length | Male Flange (min.) | Nut (min.) | Threads per Inch | Bearing (min.) | Depth of Socket (min.) | Length of Assy. (nominal) | Clear Assy. Nut |
| A | B | C | D | E | F | G | H | J | K | L | N | |
| 1/8 | 0.86 | 0.440 0.420 | 0.125 | 0.299 0.239 | 0.88 0.75 | 0.125 | 0.125 | 16 | 0.049 | 0.38 | 1.63 | 2.0 |
| 1/4 | 0.86 | 0.575 0.555 | 0.130 | 0.394 0.334 | 0.88 0.75 | 0.125 | 0.125 | 16 | 0.049 | 0.38 | 1.63 | 2.0 |
| 3/8 | 1.02 | 0.710 0.690 | 0.138 | 0.523 0.463 | 1.06 0.81 | 0.135 | 0.135 | 14 | 0.054 | 0.38 | 1.81 | 2.2 |
| 1/2 | 1.23 | 0.875 0.855 | 0.161 | 0.652 0.592 | 1.06 0.81 | 0.145 | 0.145 | 14 | 0.059 | 0.38 | 1.93 | 2.3 |
| 3/4 | 1.46 | 1.085 1.065 | 0.168 | 0.854 0.794 | 1.25 1.00 | 0.160 | 0.160 | 11 | 0.066 | 0.50 | 2.24 | 2.6 |
| 1 | 1.79 | 1.350 1.330 | 0.196 | 1.079 1.019 | 1.35 1.03 | 0.180 | 0.175 | 1 | 0.073 | 0.50 | 2.44 | 3.1 |
| 1-1/4 | 2.16 | 1.695 1.675 | 0.208 | 1.410 1.350 | 1.60 1.28 | 0.210 | 0.205 | 10 | 0.084 | 0.50 | 2.80 | 3.7 |
| 1-1/2 | 2.42 | 1.935 1.915 | 0.218 | 1.640 1.580 | 1.66 1.34 | 0.230 | 0.220 | 10 | 0.091 | 0.50 | 3.01 | 4.4 |
| 2 | 2.96 | 2.426 2.406 | 0.238 | 2.097 2.037 | 1.79 1.47 | 0.260 | 0.250 | 10 | 0.106 | 0.62 | 3.39 | 5.2 |
| 2-1/2 | 3.61 | 2.931 2.906 | 0.302 | 2.529 2.409 | 2.43 2.05 | 0.295 | 0.280 | 8 | 0.121 | 0.62 | 4.03 | 5.9 |
| 3 | 4.30 | 3.560 3.535 | 0.327 | 3.128 3.008 | 2.51 2.11 | 0.325 | 0.315 | 8 | 0.139 | 0.62 | 4.29 | 6.9 |
Note: (a) The contact diameter of the male/female end is affected by the waterway bore (Column D). The manufacturer should consider the relationship between the contact point and the waterway diameter in the design.
| NPS | Pipe End (min.) | Socket Bore Dia. | Socket Wall (min.) | Water Way Bore (a) | Laying Length | Male Flange (min.) | Nut (min.) | Threads per Inch | Bearing (min.) | Depth of Socket (min.) | Length of Assy. (nominal) | Clear Assy. Nut |
| A | B | C | D | E | F | G | H | J | K | L | N | |
| 1/8 | 0.86 | 0.440 0.420 | 0.135 | 0.189 0.126 | 0.88 0.75 | 0.125 | 0.125 | 16 | 0.049 | 0.38 | 1.63 | 2.0 |
| 1/4 | 1.02 | 0.575 0.555 | 0.158 | 0.280 0.220 | 1.06 0.81 | 0.135 | 0.135 | 14 | 0.054 | 0.38 | 1.81 | 2.2 |
| 3/8 | 1.23 | 0.710 0.690 | 0.172 | 0.389 0.329 | 1.06 0.81 | 0.145 | 0.145 | 14 | 0.059 | 0.38 | 1.93 | 2.3 |
| 1/2 | 1.46 | 0.875 0.855 | 0.204 | 0.494 0.434 | 1.25 1.00 | 0.160 | 0.160 | 11 | 0.066 | 0.38 | 2.24 | 2.6 |
| 3/4 | 1.79 | 1.085 1.065 | 0.238 | 0.642 0.582 | 1.35 1.03 | 0.180 | 0.175 | 11 | 0.073 | 0.50 | 2.44 | 3.1 |
| 1 | 2.16 | 1.350 1.330 | 0.273 | 0.845 0.785 | 1.60 1.28 | 0.210 | 0.205 | 10 | 0.084 | 0.50 | 2.80 | 3.7 |
| 1-1/4 | 2.42 | 1.695 1.675 | 0.273 | 1.190 1.130 | 1.66 1.34 | 0.230 | 0.220 | 10 | 0.091 | 0.50 | 3.01 | 4.4 |
| 1-1/2 | 2.96 | 1.935 1.915 | 0.307 | 1.368 1.308 | 1.79 1.47 | 0.260 | 0.250 | 10 | 0.106 | 0.50 | 3.39 | 5.2 |
| 2 | 3.61 | 2.426 2.406 | 0.374 | 1.717 1.657 | 2.43 2.05 | 0.295 | 0.280 | 8 | 0.121 | 0.62 | 4.03 | 5.9 |
| 2-1/2 | 4.30 | 2.931 2.906 | 0.409 | 2.155 2.095 | 2.51 2.11 | 0.325 | 0.315 | 8 | 0.139 | 0.62 | 4.29 | 6.9 |
Note: (a) The contact diameter of the male/female end is affected by the waterway bore (Column D). The manufacturer should consider the relationship between the contact point and the waterway diameter in the design.
| NPS | Pipe End (min.) | Wall (min.) | Water Way Bore (a) | Male Flange (min.) | Nut (min.) | Threads per Inch | Bearing (min.) | Length of Assy. (nominal) | Clear Assy. Nut |
| A | C | D | F | G | H | J | L | N | |
| 1/8 | 0.58 | 0.095 | 0.332 0.253 | 0.125 | 0.125 | 16 | 0.049 | 1.63 | 2.0 |
| 1/4 | 0.75 | 0.119 | 0.438 0.372 | 0.125 | 0.125 | 16 | 0.049 | 1.63 | 2.0 |
| 3/8 | 0.90 | 0.126 | 0.562 0.532 | 0.135 | 0.135 | 14 | 0.054 | 1.81 | 2.2 |
| 1/2 | 1.09 | 0.147 | 0.703 0.672 | 0.145 | 0.145 | 14 | 0.059 | 1.93 | 2.3 |
| 3/4 | 1.32 | 0.154 | 0.906 0.842 | 0.160 | 0.160 | 11 | 0.066 | 2.24 | 2.6 |
| 1 | 1.63 | 0.179 | 1.141 1.092 | 0.180 | 0.175 | 11 | 0.073 | 2.44 | 3.1 |
| 1-1/4 | 1.99 | 0.191 | 1.484 1.392 | 0.210 | 0.205 | 10 | 0.084 | 2.80 | 3.7 |
| 1-1/2 | 2.25 | 0.200 | 1.714 1.622 | 0.230 | 0.220 | 10 | 0.091 | 3.01 | 4.4 |
| 2 | 2.76 | 0.218 | 2.188 2.052 | 0.260 | 0.250 | 10 | 0.106 | 3.39 | 5.2 |
| 2-1/2 | 3.36 | 0.276 | 2.609 2.532 | 0.295 | 0.280 | 8 | 0.121 | 4.03 | 5.9 |
| 3 | 4.03 | 0.300 | 3.250 3.042 | 0.325 | 0.315 | 8 | 0.139 | 4.29 | 6.9 |
Note: (a) The contact diameter of the male/female end is affected by the waterway bore (Column D). The manufacturer should consider the relationship between the contact point and the waterway diameter in the design.
| NPS | Pipe End (min.) | Wall (min.) | Water Way Bore (a) | Male Flange (min.) | Nut (min.) | Threads per Inch | Bearing (min.) | Length of Assy. (nominal) | Clear Assy. Nut |
| A | C | D | F | G | H | J | L | N | |
| 1/8 | 0.65 | 0.124 | 0.332 0.126 | 0.125 | 0.125 | 16 | 0.049 | 1.63 | 2.0 |
| 1/4 | 0.83 | 0.145 | 0.438 0.220 | 0.135 | 0.135 | 14 | 0.054 | 1.81 | 2.2 |
| 3/8 | 0.99 | 0.158 | 0.562 0.329 | 0.145 | 0.145 | 14 | 0.059 | L.93 | 2.3 |
| 1/2 | 1.22 | 0.188 | 0.703 0.434 | 0.160 | 0.160 | 11 | 0.066 | 2.24 | 2.6 |
| 3/4 | 1.49 | 0.219 | 0.906 0.582 | 0.180 | 0.175 | 11 | 0.073 | 2.44 | 3.1 |
| 1 | 1.82 | 0.250 | 1.141 0.785 | 0.210 | 0.205 | 10 | 0.084 | 2.80 | 3.7 |
| 1-1/4 | 2.16 | 0.250 | 1.484 1.130 | 0.230 | 0.220 | 10 | 0.091 | 3.01 | 4.4 |
| 1-1/2 | 2.46 | 0.281 | 1.714 1.308 | 0.260 | 0.250 | 10 | 0.106 | 3.39 | 5.2 |
| 2 | 3.06 | 0.344 | 2.188 1.657 | 0.295 | 0.280 | 8 | 0.121 | 4.03 | 5.9 |
| 2-1/2 | 3.63 | 0.375 | 2.609 2.095 | 0.325 | 0.315 | 8 | 0.139 | 4.29 | 6.9 |
| 2-1/2 | 4.38 | 0.438 | 3.250 2.594 | 0.401 | 0.401 | 8 | 0.160 | 7.50 | 7.9 |
Note: (a) The contact diameter of the male/female end is affected by the waterway bore (Column D). The manufacturer should consider the relationship between the contact point and the waterway diameter in the design.
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