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Sour Gas Service HNBR Hammer Union Seals – Figure 1502

Our Sour Gas Service HNBR (Hydrogenated Nitrile Butadiene Rubber) Hammer Union Seals are the industry-standard solution for Figure 1502 connections in sour environments. Instantly recognizable by their distinct Green Color, these seals are formulated to comply with NACE MR0175 / ISO 15156 guidelines, offering exceptional resistance to H2S embrittlement, high-pressure extrusion, and chemically aggressive drilling fluids.

Technical Specifications

  • Working Pressure Ratings: 1,000 PSI to 22,500 PSI (depending on union rating)
  • Durometer: 80-95 Shore A

Applications

  • Hydraulic Fracking: High-pressure sand and proppant injection lines.
  • Flowback Operations: Managing post-frac fluids and gases.
  • Choke & Kill Manifolds: Safety-critical well control connections.
  • Mud Lines: Circulating drilling mud systems.
  • Acidizing & Cementing: Handling abrasive cement slurries and acid fluids.

Sour Gas Service HNBR Hammer Union Seals – Figure 1502

1. Executive Summary: The Industry Standard for H2S Safety

In the hazardous environment of sour gas production and high-pressure well stimulation, seal failure is not an option. Our Sour Gas Service HNBR Hammer Union Seals are the definitive safety solution for Figure 1502 flowline connections.

Distinguished by their industry-standard Green Color, these seals are manufactured from a high-performance Hydrogenated Nitrile Butadiene Rubber (HNBR) compound. They are engineered to withstand the lethal combination of Hydrogen Sulfide (H2S), high-pressure extrusion (up to 15,000 PSI), and aggressive corrosion inhibitors. Compliant with NACE MR0175 / ISO 15156 standards, these seals provide the assurance needed for operations in the Permian Basin, Eagle Ford, and offshore sour fields.

2. Technical Deep Dive: The Science of H2S Resistance

The Vulnerability of Standard NBR

Standard Nitrile (NBR) rubber possesses unsaturated double bonds in its polymer backbone. When exposed to Hydrogen Sulfide (H2S), a chemical reaction occurs where sulfur bridges these bonds, causing excessive cross-linking.

  • The Consequence: The rubber becomes rock-hard and brittle (embrittlement). Under the pulsation of a frac pump, a brittle seal will shatter, leading to immediate high-pressure containment loss.

The HNBR Solution (Hydrogenation)

Our HNBR is produced by fully saturating the Nitrile polymer chain with hydrogen. This process eliminates the weak double bonds, rendering the material chemically inert to H2S attack.

  • Thermal Stability: The hydrogenation process also significantly boosts thermal resistance, allowing these seals to operate continuously at 325°F (163°C), whereas standard NBR degrades at 250°F.

  • RGD Resistance: The compound is formulated with a high-modulus structure to resist Rapid Gas Decompression (RGD), preventing internal blistering when line pressure is vented.

3. Comprehensive Technical Specifications

Technical Parameter Specification Data Test Standard
Compatible Union Weco® Style Figure 1502 –
Service Classification Sour Gas Service (H2S) NACE MR0175 / ISO 15156
Material Hydrogenated Nitrile (HNBR) ASTM D1418
Color Green (Visual ID for Sour Gas) –
Durometer (Hardness) 90 Shore A (±5) ASTM D2240
Tensile Strength > 3,600 PSI (25 MPa) ASTM D412
Elongation at Break > 150% ASTM D412
Modulus @ 100% > 1,800 PSI High Stiffness for Pressure
Working Pressure 10,000 PSI (Sour Gas Derating) / 15,000 PSI (Std) –
Temperature Range -20°F to +325°F (-29°C to +163°C) Continuous
Compression Set < 25% (70 hours @ 150°C) ASTM D395

4. Chemical Compatibility Guide

  • ✅ Excellent Resistance:

    • Hydrogen Sulfide (H2S) Gas & Sour Crude.

    • Carbon Dioxide (CO2).

    • Diesel-Based Drilling Muds (OBM).

    • Amine-based Corrosion Inhibitors.

    • Dilute Acids (HCl).

  • ❌ Avoid:

    • Ketones (Acetone, MEK).

    • Chlorinated Hydrocarbons.

    • Strong Oxidizing Acids (Concentrated Nitric).

5. Operational Best Practices

  • Visual Inspection: Always verify the Green Color before installation on a sour well. Never mix Black (NBR) and Green (HNBR) seals in the same manifold to prevent accidental failure.

  • Storage: While HNBR is weather-resistant, store in UV-proof bags to maximize shelf life (up to 20 years).