Iso

2. Pipeline & Drilling

• ISO 13628: Design and operation of subsea production systems (parallels API 17 series).
• ISO 19900 series: Petroleum and natural gas industries – General requirements for offshore structures.

3. Quality & Safety

• ISO 9001: Quality Management Systems.
• ISO 14001: Environmental Management.

When to Use

Use This Skill When:

• Selecting materials for sour service (H2S).
• Working on international projects where API is not the governing code.
• Specifying fasteners and bolts.
• Establishing quality management protocols.

Knowledge Areas

1. ISO vs. API

Many ISO standards are "identical" or "modified" adoptions of API standards (e.g., ISO 13628-4 = API 17D). However, regional annexes may apply.

2. Sour Service (ISO 15156)

The definitive guide for preventing Sulfide Stress Cracking (SSC). It classifies materials based on H2S partial pressure and pH.

Code & Data Patterns

Sour Service Region Check

def check_nace_region(pH, pH2S_psi):
    """
    Determine severity region (0, 1, 2, 3) based on ISO 15156 / NACE MR0175.
    (Simplified logic for demonstration)
    """
    if pH2S_psi < 0.05:
        return "Region 0 (No specific requirements)"
    
    if pH > 3.5:
        return "Region 1 (Low Severity)"
    else:
        return "Region 3 (High Severity - Strict Material Controls)"

Best Practices

• Harmonization: Check if an API equivalent exists (e.g., API 6A vs ISO 10423).
• Traceability: ISO standards emphasize material traceability and certification (Type 3.1, 3.2 certs).

Resources

• Source Files: /mnt/ace/O&G-Standards/ISO/