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

The 4" Figure 206 Butt Weld Schedule XH Hammer Union is a massive, highly reliable flow control assembly engineered for permanent, ultra-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 4-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 superior erosion resistance of large-bore Extra Heavy (Sch XH) welded pipework.

Unlike threaded unions, this massive assembly features precision-machined Butt Weld ends designed to seamlessly integrate with standard 4-inch 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 on large-scale fluid spreads. 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 massive 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 massive 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.

• Ultra-High Flow Capacity: The massive 4-inch nominal bore easily accommodates the immense fluid volumes required for large-scale utility and massive mud mixing operations.

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

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

Specifications & Technical Details

Applications

This large-bore 4" Figure 206 Schedule XH butt weld hammer union is an essential component for ultra-high-volume, abrasive, or corrosive fluid systems where permanent, heavy-walled pipework is strictly required. Typical applications include the fabrication of massive permanent mud lines, abrasive slurry and large-scale chemical transfer networks, bulk storage tank tie-ins, welded heavy-duty 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 exceptionally thick 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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