3" Fig 602 Butt Weld (Sch XXH) Hammer Union – Oil & Gas Flowline Fitting

The 3" Figure 602 Butt Weld Schedule XXH Hammer Union is a heavy-duty, high-capacity flow control assembly engineered for permanent, maximum-security fluid routing in medium-to-high pressure upstream and midstream operations. Rated for a 6,000 PSI Cold Working Pressure (CWP), this robust, large-bore hammer union provides a dependable, fast-makeup connection between welded 3-inch piping systems. Featuring precision-machined Butt Weld ends designed to seamlessly integrate with Schedule XXH (Double Extra Heavy) pipe, this union is specifically built for heavy-duty, high-volume applications requiring maximum wall thickness to combat internal erosion, continuous vibration, and highly abrasive fluid transfer.

Unlike threaded unions, this large-bore Figure 602 assembly allows for a permanent, full-penetration welded integration into medium-pressure pipework. This securely eliminates the risk of thread-related leaks, galling, or loosening caused by the severe vibration and mechanical loads typical of truck-mounted pumping operations and massive mud systems. The Double Extra Heavy (XXH) profile provides an extended operational lifespan by offering superior erosion allowance, making it an excellent choice for permanent cementing manifolds and high-velocity abrasive slurry lines.

Manufactured from premium high-strength forged steel, the union features the hallmark Figure 602 replaceable lip-type elastomeric seal ring embedded securely into the female sub. This primary seal effectively protects the secondary metal-to-metal seating surface from abrasive fluids and corrosive agents, ensuring bubble-tight pressure containment under demanding, high-flow conditions. The robust, heavy-duty wing nut design enables fast, tool-free assembly and dismantling of welded large-bore spools in the field, optimizing operational efficiency without sacrificing structural safety.

Features & Benefits

• 6,000 PSI Pressure Rating: Engineered to safely manage continuous fluid transfer in medium-to-high pressure systems with a reliable 6,000 PSI Cold Working Pressure rating.

• Butt Weld Connection (Sch XXH): Precision-beveled ends designed for large-bore Schedule XXH (Double Extra Heavy) pipe provide maximum wall thickness, offering unmatched resistance to abrasive erosion and continuous vibration.

• High Flow Capacity: The large 3-inch bore safely accommodates the massive fluid volumes required for modern severe-service pumping and cementing applications.

• Replaceable Lip-Type Seal: Features a resilient elastomeric seal ring that provides a dependable primary barrier, minimizing turbulence and protecting metal seating surfaces from abrasive damage.

• Dual Sealing Mechanism: Combines the primary elastomer seal with a precision-machined secondary metal-to-metal seat for ultimate, leak-free pressure containment.

• Forged Steel Construction: Built from heavy-duty forged steel to deliver exceptional durability and resistance against mechanical impacts and rough field handling.

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

Specifications & Technical Details

Applications

This heavy-duty 3" Figure 602 Schedule XXH butt weld hammer union is essential for large-bore flowline networks requiring extreme structural rigidity, superior erosion resistance, and massive flow capabilities. Typical applications include the fabrication of permanent high-capacity truck-mounted pumping manifolds, massive cementing lines, severe-service mud and slurry transfer networks, and general oilfield fluid routing where Double Extra Heavy welded connections are required for maximum safety and longevity under 6,000 PSI pressure.

Quality Assurance

Each hammer union assembly undergoes rigorous quality control protocols, including precision dimensional verification of the exceptionally thick weld bevels, strict tolerance checks on the seal grooves, and full material traceability (MTRs), ensuring complete structural integrity, exceptional erosion allowance, and safe pressure containment.

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