Weld Neck Flange – 4" Class 600 Raised Face (RF) | SCH XH

The 4" Class 600 Raised Face (RF) Weld Neck Flange (Schedule XH) is a premium, heavy-duty forged piping component engineered for high-pressure, severe-stress industrial networks. Designed to securely connect pipes, massive valves, and heavy equipment, this Class 600 flange provides a robust, permanent butt-weld connection perfectly suited for demanding oil and gas, petrochemical, and power generation applications.

Unlike slip-on or threaded flanges, the weld neck flange features a distinct, long tapered hub that gradually transitions to match the wall thickness of the adjoining pipe—in this specific case, Schedule XH (Extra Heavy). This elongated hub provides critical structural reinforcement, effectively transferring severe mechanical stress away from the weld joint and distributing it evenly into the pipe body. This design makes the weld neck flange the ultimate, fail-safe choice for pipeline systems subjected to extreme temperature fluctuations, high internal pressures, and cyclic bending or vibration.

This flange features a Raised Face (RF) profile. The sealing surface is machined to sit slightly higher than the bolting circle, concentrating the mechanical bolt load onto a localized gasket area. This creates an exceptionally tight, high-integrity seal designed to contain hazardous liquids and high-pressure gases safely. Manufactured from premium forged steel, it is precision-machined to conform strictly to ASME / ANSI B16.5 dimensional standards.

Features & Benefits

• Tapered Hub Design: The distinctive weld neck hub distributes mechanical stress and pipeline vibration away from the weld joint, preventing localized fatigue and extending system lifespan.

• Class 600 Pressure Rating: Engineered to safely handle severe high-pressure environments, making it ideal for critical infrastructure and hazardous fluid transfer lines.

• Schedule XH Bore: The internal bore is precision-machined to match Schedule XH (Extra Heavy) piping, ensuring a smooth, turbulence-free transition of internal fluids and combating abrasive wear.

• Raised Face (RF) Profile: The elevated sealing face concentrates gasket compression, maximizing seal integrity and virtually eliminating the risk of high-pressure blowouts.

• ASME B16.5 Compliant: Machined to strict industry tolerances to guarantee a perfect face-to-face fit with standard mating equipment and heavy-duty piping networks.

Specifications & Technical Details

Applications

This 4-inch Class 600 SCH XH weld neck flange is a critical infrastructure component for severe-service industrial facilities. Typical applications include high-pressure pump discharge headers, massive compressor station piping, extreme-temperature refinery lines, heavy-duty steam networks, and rigorous oilfield fluid routing where structural integrity is paramount.

Quality Assurance

All our industrial flanges are manufactured from premium forged steel and subjected to strict quality control processes. Each weld neck flange undergoes rigorous dimensional inspection, precision bore and face machining verification, and thorough non-destructive testing (NDT) to ensure absolute structural integrity and defect-free sealing surfaces. Full material test reports (MTRs) are available upon request to guarantee full compliance with ASME and ANSI industry standards.

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