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Large Diameter Weld Neck Flange
Large Diameter Weld Neck Flange
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Large Diameter Weld Neck Flanges are designed for heavy-duty piping systems, pressure equipment, and large industrial connections where reliable weld transition and structural strength are required. Compared with standard-size flanges, large diameter forged weld neck flanges are typically used in projects involving high flow capacity, large line size, and demanding service conditions.
The tapered hub design helps improve stress distribution between flange and pipe, making this type suitable for applications where welding performance and long-term connection stability are important. These flanges are commonly supplied for oil and gas, petrochemical, offshore, energy, and heavy process industries.
We manufacture large diameter weld neck flanges in forged carbon steel, alloy steel, stainless steel, and other project-specified materials. Available standards may include ASME, EN, DIN, JIS, and custom drawing requirements. Products can be supplied as forged blanks, rough machined flanges, or fully machined finished flanges according to customer specifications
| Parameter | Description |
|---|---|
| Key Features | Tapered hub for stress distribution, butt-weld connection, suitable for large-bore piping systems, available in Series A (MSS SP-44) and Series B (API 605) |
| Typical Materials | A105, A182 F11/F22/F91, A182 F304/F316, A350 LF2, per drawing |
| Applicable Standards | ASME B16.47 Series A / Series B, ASME B16.5 (for sizes ≤24″), project custom |
| Pressure Class | Class 150 / 300 / 400 / 600 / 900 (ASME B16.47 covers up to Class 900) |
| Size Range | 26″~60″ (DN650~DN1500) as standard; larger sizes per drawing |
| Facing Type | RF / RTJ (RTJ standard for high-pressure and high-temperature service) |
| Hub Design | Long tapered hub for reinforcement and smooth stress transition at weld joint |
| Key Control Points | Flatness control for large sealing faces, bolt-hole accuracy (bolt circle diameter, hole alignment), RTJ groove machining (when applicable), hub taper and weld-end preparation |
| Supply Condition | As-forged / Normalized / Quenched & tempered / Rough machined / Finished |
| Marking | Permanent marking per ASME B16.47 / project spec: size, rating, material, heat/lot number, manufacturer identification |
| Inspection & Docs | EN 10204 3.1 / MTC, dimensional inspection report, UT/MT/PT per ITP, PMI as required, RTJ groove inspection (if applicable), traceability list |
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