4" ANSI 300# x 3" Fig 206 Female Thread Flange Adapter, Butt Welded Sch XH – Oil & Gas Flowline Fitting

The 4" ANSI 300# x 3" Fig 206 Female Thread Flange Adapter is a highly robust size-reducing crossover component designed to reliably connect standard facility piping with temporary flowlines. Engineered for efficient fluid transfer in upstream, midstream, and industrial operations, this adapter bridges a permanent 4-inch ANSI Class 300 flanged connection down to a standard 3-inch Figure 206 female hammer union interface.

Unlike standard single-piece forged adapters, this crossover utilizes a heavy-duty butt-welded construction featuring Schedule XH (Extra Heavy) wall thickness. The thick-walled Schedule XH piping provides superior structural rigidity, erosion resistance, and longevity when handling abrasive fluids, mud, and continuous flow operations. The high-integrity butt-weld integration ensures a smooth internal flow bore, minimizing turbulence and pressure drops across the size transition.

The Figure 206 union connection is specifically designed for fluid transfer, utilizing a secondary O-ring seal (embedded in the mating male sub) to provide enhanced leak-free performance even in less-than-ideal alignment conditions. Serving as a durable interface between permanent facility infrastructure and temporary hoses or piping, this welded flange adapter optimizes layout flexibility while maintaining rigorous structural safety. (Note: The maximum working pressure of the assembly is governed by the ANSI Class 300 flange rating).

Features & Benefits

• Butt-Welded Construction: Features a high-integrity, full-penetration butt weld that ensures a smooth internal transition and exceptional structural strength.

• Schedule XH Wall Thickness: Constructed with Extra Heavy (XH) piping to provide superior resistance against internal wear, abrasion, and fluid degradation.

• Seamless Size Transition: Efficiently steps down fluid flow from a larger 4-inch ANSI Class 300 facility pipe to a standard 3-inch temporary line.

• Precision-Machined 206 Thread: The 3-inch female union end ensures secure, smooth engagement with standard Fig 206 male hammer union components for reliable O-ring sealing.

• Industrial Durability: Built to withstand harsh weather, mechanical impacts, and the demanding operational environments of mud and water transfer.

• Optimized Flow: The matched bore and welded design reduce flow turbulence and minimize the risk of localized erosion during heavy fluid routing.

Specifications & Technical Details

Applications

This butt-welded Schedule XH flange adapter is essential for operations requiring a highly durable, size-reducing transition between permanent facility piping and temporary flowline equipment. Typical applications include midstream facility tie-ins, heavy-duty mud mixing networks, high-volume water transfer stations, suction lines, and standard industrial pump connections where continuous flow is required.

Quality Assurance

Each butt-welded crossover adapter undergoes stringent quality control protocols. This includes rigorous Non-Destructive Testing (NDT) on all welds, precise dimensional and thread gauging, flange facing inspection, and material verification, ensuring safe, leak-free, and reliable field performance.

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