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3" 10,000 PSI Fig 1502 Sour Service Male Blind Sub with Wing Nut – Oil & Gas Flowline Fitting
3" 10,000 PSI Fig 1502 Sour Service Male Blind Sub with Wing Nut – Oil & Gas Flowline Fitting
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The 3" Figure 1502 Sour Service Male Blind Sub with Wing Nut is a critical, heavy-duty closure assembly engineered specifically to cap off and isolate female threaded hubs in hazardous hydrogen sulfide (H2S) environments. While standard Figure 1502 fittings are rated to 15,000 PSI, this specialized sour service blind is strictly de-rated to a Cold Working Pressure (CWP) of 10,000 PSI in compliance with industry safety standards. It is an essential component for safely dead-ending flowlines and well-testing manifolds exposed to toxic sour gases.
Manufactured from premium forged alloy steel, the entire assembly—including the male blind sub and the heavy-duty wing nut—undergoes a specialized heat-treatment process to meet stringent NACE MR0175 / ISO 15156 requirements. This controlled metallurgical process significantly reduces the material's hardness, preventing the catastrophic effects of Sulfide Stress Cracking (SSC) and hydrogen embrittlement that occur when standard steel is exposed to H2S under high pressure. Because it comes pre-assembled with the wing nut, rig crews can immediately deploy the blind to securely terminate pressurized systems.
Designed for uncompromising safety in the most lethal upstream environments, the 3" 1502 Sour Service Male Blind Sub ensures absolute fluid and gas containment, protecting both rig personnel and the environment during sour well testing, flowback, and production operations.
Features & Benefits
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NACE MR0175 Compliant: Specially heat-treated to resist sulfide stress cracking (SSC) in hazardous H2S environments.
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10,000 PSI CWP Rating: Safely contains extreme pressures (de-rated from 15K specifically for sour gas safety parameters).
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Complete Assembly: Comes fully equipped with the male blind sub and heavy-duty wing nut for immediate, drop-in field deployment.
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Forged Alloy Steel Construction: Delivers superior structural strength, resisting mechanical impact and severe vibration.
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Positive Isolation: Provides a secure, blowout-proof dead-end for toxic high-pressure fluid and gas lines.
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Standard Interchangeability: Fully compatible with all industry-standard 3" Figure 1502 female threaded hubs (ensure the mating hub is also sour service rated).
Specifications & Technical Details
| Category | Specification |
| Component Type | Sour Service Blind Sub Assembly |
| Figure Number | Figure 1502 (Sour Service) |
| Size | 3" |
| Pressure Rating | 10,000 PSI CWP (10M) - De-rated for H2S |
| End Connection | 3" Fig 1502 Male (with Wing Nut) |
| Material | Heat-Treated Forged Alloy Steel |
| Service Type | Sour Gas / H2S Service |
| Compliance Standard | NACE MR0175 / ISO 15156 |
| Typical Applications | Sour well testing, H2S flowlines, choke manifolds |
| Testing & Compliance | Strict hardness testing (max 22 HRC), NDE, and material traceability |
Applications
This 3" Figure 1502 sour service male blind sub with wing nut is strictly required for operations exposed to hydrogen sulfide. Typical uses include capping off unused female branches on sour choke and kill manifolds, dead-ending H2S well-testing lines, and securing sour gas gathering systems where blowout prevention and metallurgical integrity are critical.
Quality Assurance
Each sour service blind assembly is manufactured under rigorous quality control protocols. The fitting undergoes precise dimensional inspection, non-destructive examination (NDE), and strict Rockwell hardness testing to ensure the material remains below the NACE-mandated 22 HRC threshold, guaranteeing safe performance in volatile H2S environments.
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📧 seo@blazess.com
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