3" Fig 1502 Butt Weld (Sch XH) Sour Service Hammer Union – Oil & Gas Flowline Fitting

The 3" Figure 1502 Butt Weld Schedule XH Sour Service Hammer Union is a highly specialized, extreme-duty flow control assembly engineered for permanent, high-volume fluid routing in hazardous, hydrogen sulfide (H2S) rich environments. While standard Figure 1502 unions are rated for 15,000 PSI, this Sour Service model is strictly derated to a 10,000 PSI Cold Working Pressure (10M CWP) in strict compliance with NACE MR0175 / ISO 15156 standards. This derating, combined with specialized heat treatment, is critical to prevent Sulfide Stress Cracking (SSC) and ensure absolute structural safety in lethal sour gas applications.

Featuring precision-machined Butt Weld ends designed to seamlessly integrate with Schedule XH (Extra Heavy) 3-inch pipe, this union allows for permanent, full-penetration welded integration into high-capacity pipework. This eliminates the risk of thread-related leaks or backing-off caused by the severe vibration and mechanical loads typical of massive pumping operations and sour well testing.

Manufactured from specially heat-treated, high-strength forged alloy steel (strictly controlled to maximum hardness limits for H2S environments), the union is built to withstand extreme internal stresses. It features a specialized, replaceable lip-type elastomeric seal ring molded from highly chemical-resistant fluoroelastomer compounds (such as FKM/Viton) specifically formulated to resist degradation from sour gas. This primary seal protects the secondary metal-to-metal seating surface, ensuring absolute bubble-tight pressure containment under massive fluid loads.

Features & Benefits

• NACE MR0175 Compliant: Manufactured from specially controlled and heat-treated alloy steel to resist Sulfide Stress Cracking (SSC) in severe H2S environments.

• 10,000 PSI Derated Pressure (10M): Safely rated for 10,000 PSI Cold Working Pressure specifically for sour service, providing a massive safety factor for hazardous gas containment.

• Butt Weld Connection (Sch XH): Precision-beveled ends designed for large-bore Schedule XH pipe allow for permanent, high-integrity welded connections, providing superior resistance to vibration.

• H2S Resistant Lip Seal: Features a specialized fluoroelastomer lip seal that provides a dependable primary barrier against highly corrosive sour gas and fluids.

• High Flow Capacity: The large 3-inch nominal size accommodates the massive fluid volumes required for severe-service pumping and well testing applications.

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

Specifications & Technical Details

Applications

This specialized 3" Figure 1502 Schedule XH sour service butt weld hammer union is absolutely critical for upstream operations where hazardous Hydrogen Sulfide (H2S) is present. Typical applications include sour well testing flowlines, H2S-rated choke and kill manifolds, permanent sour gas transfer lines, heavy-duty acidizing networks, and the fabrication of welded pipe spools requiring absolute compliance with NACE MR0175 safety standards.

Quality Assurance

Each sour service hammer union assembly undergoes rigorous, specialized quality control protocols. This includes strict hardness testing to ensure NACE MR0175 compliance (<22 HRC), severe hydrostatic testing, precision dimensional verification of the weld bevels, and comprehensive material traceability (MTRs), ensuring fail-safe structural integrity and secure pressure containment in lethal gas environments.

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