ASME B16.5 | Socket Weld (SW) | RF / FF / RTJ | Class 150–2500
Socket Weld Flanges are designed with a machined socket into which the pipe is inserted before welding. The socket configuration provides accurate pipe positioning, good alignment, and a compact, reliable connection for small-bore, high-pressure and high-temperature piping systems.
Elite supplies Socket Weld Flanges in carbon steel, stainless steel, duplex and super duplex stainless steel, alloy steel, low-temperature carbon steel, nickel alloys, and copper-nickel alloys. Products are manufactured and supplied in accordance with applicable ASME, ASTM, MSS, API, EN, DIN, BS and customer project specifications.
| Category | Specification |
|---|---|
| Flange Type | Socket Weld (SW) |
| Nominal Size | As covered by applicable ASME B16.5 size/class combinations |
| Pressure Classes | 150, 300, 400, 600, 900, 1500, 2500 |
| Facing | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), where applicable |
| Primary Dimensional Standard | ASME B16.5 |
| Manufacturing Standard | Forged, in accordance with applicable material and flange specifications |
| Socket Bore | Machined socket bore to accommodate specified pipe OD |
| Pipe Connection | Socket weld |
| Bore Configuration | Standard or specially machined bore, as specified |
| Surface Finish | Standard ASME finish or customer specified |
| Heat Treatment | As required by applicable material specification |
| Inspection | Visual, dimensional, chemical and mechanical testing as applicable |
| NDE | PMI, UT, MT, PT and other NDE as specified |
| Documentation | MTC, EN 10204 3.1/3.2, COC and inspection reports |
| Special Requirements | ITP, third-party inspection, NACE/ISO 15156 and customer specifications |
For the U.S. market, the primary dimensional and pressure-rating standard is:
Note: Large-diameter standards such as ASME B16.47, MSS SP-44 and API 605 should only be referenced when the applicable flange design and project specification specifically call for them. They should not be presented as standard Socket Weld Flange dimensional standards.
Carbon Steel
ASTM A105/A105N, ASTM A181, ASTM A350 LF2/LF3 and ASTM A694 grades including F42, F46, F52, F60 and F65.
Stainless Steel
ASTM A182 F304/F304L, F316/F316L, F321/F321H, F347/F347H, F310/F310S, F317 and F904L.
Duplex & Super Duplex
ASTM A182 F51, F53 and F55.
Alloy Steel
ASTM A182 F1, F5, F9, F11, F12, F22, F91 and F92.
Nickel Alloys
Nickel 200/201, Monel 400/K500, Inconel 600/601/625/800/825, Hastelloy C276 and Alloy 20.
Copper-Nickel Alloys
UNS C70600 and C71500, including 90/10 and 70/30 Cu-Ni alloys.
Material selection is based on operating pressure, temperature, process fluid, corrosion conditions, mechanical requirements and applicable project specifications.
Raised Face — RF
The most common configuration for process and industrial piping applications. The raised sealing surface provides a defined gasket seating area.
Flat Face — FF
Used where a full-face mating surface is required, including selected equipment, piping and lower-pressure applications.
Ring Type Joint — RTJ
Used for demanding high-pressure and high-temperature services where a metallic ring gasket provides the sealing arrangement.
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Elite Socket Weld Flanges can be supplied with complete quality documentation, including:
The Socket Weld Flange incorporates a machined internal socket into which the pipe is inserted to the specified depth before welding.
The design provides:
Proper installation should follow the applicable ASME B31 piping code, project welding procedure, WPS/PQR and flange/pipe manufacturer’s requirements.
Socket Weld Flanges are commonly used in:
For quotation, please specify:
NPS + Class + Facing + Material + Standard + Pipe Schedule/OD + Quantity + Inspection Requirements
Example:
2″ Class 600 Socket Weld Flange, RF, ASME B16.5, ASTM A182 F316L, Socket Bore for Sch. 80 Pipe, MTC EN 10204 3.1.
