2" Fig 1502 NPST Pup Joint (M x F) – 1 FT | Sour Service (H2S) Flowline Pipe

The 2" Figure 1502 NPST (Non-Pressure Seal Thread) Pup Joint (1 FT) for Sour Service is a highly specialized, ultra-compact flowline component engineered specifically for the safe transport of toxic, abrasive, and high-velocity fluids in environments containing Hydrogen Sulfide (H2S). Measuring just 1 foot in length, this short pipe segment is absolutely essential for making precise micro-adjustments in pipeline spacing and bridging extremely tight gaps between flowback equipment in hazardous conditions. To comply with strict industry safety standards for sour gas environments (NACE MR0175 / ISO 15156), this Figure 1502 component is explicitly derated to a highly secure 10,000 PSI Cold Working Pressure (CWP).

What differentiates this pup joint is its highly efficient NPST (Non-Pressure Seal Thread) construction combined with specialized sour service metallurgy. The joint is fabricated by threading premium, heavy-wall seamless steel tubing into forged alloy steel Figure 1502 union ends. A specialized internal elastomeric O-ring isolates the fluid, ensuring the mechanical threads do not hold fluid pressure, completely eliminating the risk of thread wash-out. Crucially, all steel components undergo rigorous, specialized heat treatment to maintain a strictly controlled hardness level, effectively resisting Sulfide Stress Cracking (SSC) and Hydrogen-Induced Cracking (HIC) common in sour environments.

Configured with industry-standard Figure 1502 Male x Female (M x F) hammer union ends, this pup joint ensures rapid, tool-free rig-up in confined rig spaces. The Female end houses a specialized, H2S-resistant replaceable lip-type elastomeric seal (typically Viton or highly saturated nitrile), providing a bubble-tight primary barrier that protects the secondary metal-to-metal seating surfaces. This NPST pup joint offers a lighter, cost-effective, and exceptionally reliable solution for highly precise spacing in dangerous sour service operations.

Features & Benefits

• 10,000 PSI Sour Service Rating: Explicitly derated to 10,000 PSI Cold Working Pressure to safely manage extreme high-pressure fluid systems containing toxic H2S gas.

• NACE MR0175 Compliant: Manufactured and strictly heat-treated to meet or exceed NACE MR0175 / ISO 15156 standards for resistance against Sulfide Stress Cracking (SSC).

• NPST Construction: Features Non-Pressure Seal Thread fabrication, keeping high-pressure corrosive fluid off the mechanical threads to prevent wash-out and ensure leak-free performance.

• Ultra-Short 1-Foot Length: Provides the exact minimal reach required for tight spacing adjustments and connecting manifold components that are in close physical proximity.

• H2S-Resistant Sealing: Utilizes precision-machined metal-to-metal seats combined with a specialized, chemically resilient elastomeric seal engineered to withstand corrosive sour gases.

• Male x Female (M x F) Connections: Features standard Fig 1502 hammer union ends for fast, seamless, and highly secure integration into existing sour service iron spreads.

Specifications & Technical Details

Applications

This specialized 2" Figure 1502 NPST Sour Service Pup Joint (1 FT) is a strictly required asset for upstream operations where Hydrogen Sulfide (H2S) is present and tight physical space is a factor. Typical applications include the construction of compact sour gas choke-and-kill manifolds, precise spacing alignments on severe-service H2S flowback spreads, well testing in toxic environments, and any critical fluid routing where a secure, NACE-compliant, ultra-short 10,000 PSI connection is mandated for personnel and environmental safety.

Quality Assurance

Each sour service NPST pup joint undergoes the most rigorous quality control protocols in the industry. This includes severe hydrostatic pressure testing to verify the internal O-ring seal integrity, complete dimensional verification, magnetic particle inspection (MPI), and vital hardness testing to ensure strict NACE compliance. Full material traceability (MTRs) is provided to guarantee fail-safe structural integrity in hazardous H2S conditions.

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