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China ANSI Stainless Steel Forged Pipe Flange Suppliers - Factory Direct Sizes & Classes Available
Product Details
Pipe flanges are used to join pipes and other piping components—such as valves, fittings, and special equipment—by means of bolts and gaskets. Depending on the design, flanges can be connected through welding, lapping, or threaded installation.
Using pipe flanges offers several advantages. They provide a strong and reliable joint between pipes and equipment, allow easy access for inspection, maintenance, or system modification, and help reinforce the connection area.
The method of connection depends on the flange type and its intended application. Before installation, factors such as the conveyed medium, operating temperature, pressure rating, flange size, and relevant standards should be carefully evaluated to ensure safe and stable performance of the piping system.
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Key selection factors include: conveyed medium, operating temperature, pressure rating, flange size, and applicable ASME standards. Proper evaluation ensures safe and stable piping system performance.
| Flange Type | NPS (inch) | ASME Class | Faces | Joint Integrity | Weld | ASME Standards |
|---|---|---|---|---|---|---|
| Welding Neck Flange | All | All | All | High | One butt weld. | B16.5, B31.3 |
| Slip-on Flange | Many | Generally, ≤ 600 | FF, RF | Medium | One or two fillet welds. | B16.5, B31.3 |
| Socket Weld Flange | Generally, ≤ ½ to 2. Max ≤ 4 | ≤ 600 | FF, RF | Medium | One fillet weld. | B16.5, B31.3 |
| Lap Joint Ring Flange | Not used for small sizes. | NA | FF | NA | None | B16.5, B31.3 |
| Stub End of Lap Joint Flange | 150 to 2500 | FF, RF, RTJ | High | One butt weld. | B16.9, B31.3 | |
| Threaded Flange | Generally, ≤ ½ to 2. Max ≤ 4 | ≤ 300 | FF, RF | Low | None | B1.20.1, B31.3 |
| Blind Flange | All | All | All | NA | None | B16.5, B31.3 |
Specification
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Pipe Flanges Raw Material Specifications
- Stainless Steel Flange ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
- Duplex & Super Duplex Steel Flange ASTM A182 / ASME SA182 F44, F 45, F51, F 53, F 55, F 60, F 61
- Carbon Steel Flange ASTM A105 / ASME SA105 ASTM / ASME A 350, ASTM A181 LF2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706
- Low Temperature Carbon Steel Flange ASTM A350, LF2, LF3
- Alloy Steel Flange ASTM A182 / ASME SA182 & A387 F1, F5, F9, F11, F12, F22, F91
- Copper Alloy Steel Flange ASTM SB 61, SB62, SB151, SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200
- Nickel Alloy Flange ASTM SB564, SB160, SB472, SB162 — Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020)
Frequently Asked Questions
Q
What is the main purpose of a pipe flange?
Pipe flanges are used to join pipes and other piping components—such as valves, fittings, and special equipment—by means of bolts and gaskets. They provide a strong, reliable, and accessible connection that allows for easy inspection, maintenance, or system modification.
Q
What is the difference between a Welding Neck Flange and a Slip-on Flange?
A Welding Neck Flange offers high joint integrity and is suitable for all NPS sizes and ASME classes, connected via one butt weld. A Slip-on Flange provides medium joint integrity, is generally limited to ASME Class ≤ 600, and uses one or two fillet welds. Welding Neck Flanges are preferred for high-pressure and high-temperature applications.
Q
Which flange types do not require welding?
Threaded Flanges, Blind Flanges, and Lap Joint Ring Flanges do not require welding. Threaded Flanges use a threaded connection, while Blind Flanges and Lap Joint Ring Flanges are simply bolted in place without any weld requirement.
Q
What factors should be considered when selecting a pipe flange?
Key factors include the type of conveyed medium, operating temperature, pressure rating, flange size (NPS), face type (FF, RF, RTJ), required ASME standard, and the method of connection (welded, threaded, or lapped). Careful evaluation of these factors ensures safe and stable performance of the piping system.
Q
What materials are available for pipe flanges?
Pipe flanges are available in a wide range of materials including Stainless Steel (e.g., 304, 316, 904L), Duplex & Super Duplex Steel, Carbon Steel, Low Temperature Carbon Steel, Alloy Steel, Copper Alloy Steel, and Nickel Alloys (e.g., Monel, Inconel, Hastelloy). Each material is suited to specific operating environments and industry requirements.
Q
What ASME standards apply to pipe flanges?
The most commonly referenced ASME standards for pipe flanges include ASME B16.5 (covering flanges from Class 150 to 2500), ASME B16.9 (for factory-made wrought fittings including stub ends), ASME B1.20.1 (for threaded pipe connections), and ASME B31.3 (for process piping design and installation). The applicable standard depends on the flange type and application.
Product Packaging
01020304