MSS SP-83 | Forged Socket Weld Union | Class 3000–6000 | NPS 1/8–3
Elite is a manufacturer and supplier of Forged Socket Weld Unions for small-bore piping systems where a detachable connection is required. Socket Weld Unions are three-piece fittings consisting of a male end, female end and union nut, allowing the piping connection to be assembled or dismantled without cutting the pipe.
Elite Socket Weld Unions are manufactured for reliable service in process piping, oil & gas, chemical, petrochemical, power generation, pharmaceutical and other industrial applications. They are available in Class 3000 and Class 6000 configurations in accordance with MSS SP-83, with socket-weld ends designed for permanent welded connection to the pipe. MSS SP-83 specifically covers forged carbon steel, alloy steel, stainless steel and nickel alloy unions with socket-welding and threaded ends.
| Product | Socket Weld Union | |
|---|---|---|
| Primary Standard | MSS SP-83 | |
| Related Standard | ASME B16.11 | |
| Size Range | NPS 1/8" to 3" | |
| Pressure Classes | Class 3000 / Class 6000 | |
| Connection | Socket Weld | |
| Construction | Forged | |
| Design | Three-Piece Union | |
| Components | Male End / Female End / Union Nut | |
| Seating | Integral Metal-to-Metal Seating | |
| Material | Carbon Steel / Alloy Steel / Stainless Steel / Nickel Alloy | |
| Heat Treatment | As required by applicable material specification | |
| Inspection | Visual / Dimensional / PMI / NDE as specified | |
| Marking | Standard and customer-specific marking | |
| Documentation | MTC, inspection reports and certificates as required | |
| Standards Note | ||
| MSS SP-83-2025 is the specific standard for Class 3000 and Class 6000 Pipe Unions, Socket Welding and Threaded. It defines essential dimensions, finish, tolerances, testing, marking, materials and minimum performance requirements for forged pipe unions. | ||
| For socket-weld unions, the applicable standard classes are Class 3000 and Class 6000. Class 2000 and Class 9000 are not listed for MSS SP-83 socket-weld unions. | ||
| ASME B16.11 covers forged socket-welding and threaded fittings generally, but MSS SP-83 is the specific union standard. | ||
| Product Type | Available Options |
|---|---|
| Forged Socket Weld Union | MSS SP-83 Socket Weld Union |
| Class 3000 Socket Weld Union | Class 6000 Socket Weld Union |
| Stainless Steel Socket Weld Union | Carbon Steel Socket Weld Union |
| Alloy Steel Socket Weld Union | Nickel Alloy Socket Weld Union |
| Forged Steel Socket Weld Union | Stainless Steel Forged Union |
| High-Pressure Socket Weld Union | Heavy-Duty Forged Union |
| ASTM A182 Socket Weld Union | ASTM A105 Socket Weld Union |
| Duplex / Special Alloy Union | Project-Specific Socket Weld Union |
| Custom Socket Weld Union | Special Material / Dimension Union |
Stainless Steel Forged Socket Weld Union:
ASTM A182 F304, F304L, F304H, F316, F316L, F316H, F316Ti, F316LN, F317, F317L, F321, F321H, F347, F347H, F309S, F309H, F310S, F310H, F904L and other applicable stainless steel grades.
Duplex & Super Duplex Steel Forged Socket Weld Union:
ASTM A182 F51, F53, F55; UNS S31803, S32205, S32550, S32750, S32760, S32950 and other applicable duplex grades. Special duplex materials are available subject to project requirements.
Carbon Steel Forged Socket Weld Union:
ASTM A105 / A105N, ASTM A350 LF2, LF3 and other applicable carbon steel forging grades.
Alloy Steel Forged Socket Weld Union:
ASTM A182 F1, F5, F9, F11, F12, F22, F23, F91, F92 and other applicable alloy steel grades.
Nickel Alloy Forged Socket Weld Union:
ASTM/ASME SB160, SB163, SB336, SB366, SB407, SB564; UNS N02200 Nickel 200, N02201 Nickel 201, N04400 Monel 400, N05500 Monel K500, N08020 Alloy 20, N08825 Inconel 825, N06600 Inconel 600, N06601 Inconel 601, N06625 Inconel 625 and N10276 Hastelloy C276.
Copper-Nickel, Titanium & Special Alloys:
Available for project-specific applications where required, subject to engineering review, material specification and applicable product requirements.
Elite Socket Weld Unions are available in various configurations:
Important: MSS SP-83 states that union parts from different manufacturers are not necessarily functionally interchangeable. Therefore, the male end, female end and nut should be supplied as a matched assembly.
The MSS SP-83 design uses integral metal-to-metal seating and a three-piece union assembly.
Elite can supply Socket Weld Unions according to project-specific requirements, including:
Elite Socket Weld Unions are manufactured using controlled forging and machining processes to achieve dimensional accuracy, mechanical strength and reliable service performance.
Manufacturing and quality control may include:
Inspection and documentation can be provided according to project and customer requirements:
Elite manufactures and supplies:
Socket Weld Unions are used where a small-bore pipe connection needs to be disconnected for maintenance, inspection or equipment replacement.
Typical applications include:
When requesting a quotation, please provide:
Nominal Pipe Size (NPS)
Pressure Class
Material Grade
Socket Weld Connection
Applicable Standard
Quantity
Inspection Requirements
Documentation Requirements
Special Project Requirements
Example
2″ Class 6000 Socket Weld Union, ASTM A182 F316L, Forged Construction, MSS SP-83, Socket Weld Ends, EN 10204 3.1.
