3" Fig 206 Butt Weld (Sch XH) Hammer Union – Low-Pressure Flowline Fitting

The 3" Figure 206 Butt Weld Schedule XH Hammer Union is a highly reliable, heavy-duty flow control assembly engineered for permanent, high-volume fluid routing in demanding low-to-medium pressure industrial and oilfield applications. Rated for a 2,000 PSI Cold Working Pressure (CWP), this robust hammer union provides a fast-makeup, highly secure connection between welded 3-inch piping systems. It is uniquely designed to combine the enhanced sealing capabilities of the Figure 206 O-ring design with the structural rigidity and erosion resistance of Extra Heavy (Sch XH) welded pipework.

Unlike threaded unions, this assembly features precision-machined Butt Weld ends designed to seamlessly integrate with standard Schedule XH pipe dimensions. This allows for a permanent, full-penetration welded integration into pipework, completely eliminating the risk of thread-related leaks, galling, or loosening caused by continuous line vibration. The Extra Heavy (XH) profile provides superior wall thickness, making it exceptionally well-suited for high-capacity abrasive mud systems and corrosive fluid transfers where internal wear is a primary concern.

Manufactured from high-strength industrial-grade forged steel, the Figure 206 union utilizes a dual-sealing mechanism. The primary metal-to-metal seating surface is powerfully reinforced by a resilient elastomeric O-ring embedded directly into the male sub. This O-ring effectively fills microscopic imperfections and guarantees a bubble-tight seal even in the presence of mildly abrasive fluids or slight pipe misalignments. The heavy-duty wing nut allows for rapid, tool-free assembly and dismantling of permanent welded spools in the field, critically reducing maintenance and rig-up times.

Features & Benefits

• 2,000 PSI Pressure Rating: Engineered to safely manage continuous fluid transfer in standard low-pressure systems with a reliable 2,000 PSI Cold Working Pressure (CWP) rating.

• Butt Weld Connection (Sch XH): Precision-beveled ends designed for Schedule XH (Extra Heavy) pipe provide permanent welded connections with superior resistance to abrasive erosion and continuous vibration.

• Secondary O-Ring Seal: Features an elastomeric O-ring embedded in the male sub, providing an enhanced secondary seal that ensures leak-free performance against corrosive and abrasive fluids.

• High Flow Capacity: The large 3-inch nominal bore easily accommodates the massive fluid volumes required for large-scale utility and mud mixing operations.

• Dual Sealing Mechanism: Combines traditional metal-to-metal seating with a resilient O-ring to ensure dependable pressure containment.

• Rapid Spool Makeup: The robust wing nut allows for quick, ultra-secure connections and disconnections between permanent welded pipe spools in the field.

Specifications & Technical Details

Applications

This 3" Figure 206 Schedule XH butt weld hammer union is an essential component for high-volume, abrasive, or corrosive fluid systems where permanent, heavy-walled pipework is required. Typical applications include the fabrication of large-bore permanent mud lines, abrasive slurry and chemical transfer networks, bulk storage tank tie-ins, welded pump suction routing, and general industrial fluid transfer where rapid break-out capability and enhanced O-ring sealing are critical.

Quality Assurance

Each hammer union assembly undergoes rigorous quality control protocols, including precision dimensional verification of the weld bevels, exact O-ring groove inspection, and full material traceability (MTRs), ensuring complete structural integrity, safe pressure containment, and reliable field performance.

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