Marine Safety

---

name: marine-safety
version: "1.0.0"
category: engineering
description: "Assess offshore asset integrity, corrosion management, and life extension for aging marine structures"
type: reference
capabilities: []
requires: []
see_also: []
tags: []
scripts_exempt: true
---

# Marine Safety & Integrity Specialist

> Integrity management, life extension, and safety assessment for offshore assets.

**Version:** 1.0.0
**Created:** 2026-01-13
**Category:** SME / Safety & Integrity

## Overview

This skill covers the assessment of aging offshore assets, focusing on structural integrity, corrosion management, and life extension. It synthesizes knowledge from legacy projects like "GoM field H TTR VIV Analysis" and "Marlin TTR Life Extension".

## Core Capabilities

### 1. Life Extension Assessment (LEX)
- **Gap Analysis**: Comparing original design codes vs. current standards (API 2INT-MET).
- **Fatigue Re-analysis**: Using updated metocean data to calculate remaining fatigue life.
- **Risk-Based Inspection (RBI)**: Prioritizing inspections based on failure probability and consequence.

### 2. Corrosion Management
- **Corrosion Rate Modelling**: CO2/H2S corrosion prediction (Norsok M-506).
- **Wall Thickness Checks**: Evaluating hoop stress and collapse/burst pressure with degraded wall thickness.
- **Anode Retrofit**: Designing sacrificial anode sleds for life extension.

### 3. Fitness-For-Service (FFS)
- **API 579 / BS 7910**: Assessing defects (cracks, dents, corrosion) to determine if equipment is safe to operate.
- **VIV Assessment**: Vortex Induced Vibration fatigue analysis for risers and conductors.

## When to Use

### Use This Skill When:
- Evaluating an asset for operation beyond its original design life.
- Assessing the safety of a corroded pipeline or vessel.
- Planning inspection campaigns (RBI).
- Reviewing "Fitness for Service" reports.

### Do Not Use This Skill When:
- Designing a *new* asset (use Structural Analysis or DNV Standards).
- Calculating basic hydrostatics (use Marine Engineering).

## Knowledge Areas

### 1. Life Extension Workflow
1.  **Data Gathering**: Collect original design reports, inspection logs, and production history.
2.  **Condition Assessment**: Evaluate current physical state (corrosion, marine growth).
3.  **Re-Analysis**: Update models with current weight, metocean, and soil data.
4.  **Remediation**: Propose clamps, strengthening, or derating.

### 2. Defect Assessment
Cracks or metal loss are evaluated using "Failure Assessment Diagrams" (FAD) to determine if the combination of stress and defect size is critical.

## Code & Data Patterns

### Corrosion Derating Check
```python
def check_wall_thickness(nominal_wt, corrosion_rate, years, min_required_wt):
    """
    Calculate remaining wall thickness and check against minimum required.
    """
    loss = corrosion_rate * years
    current_wt = nominal_wt - loss
    
    if current_wt < min_required_wt:
        return False, f"FAILED: Current WT {current_wt:.2f}mm < Min {min_required_wt:.2f}mm"
    
    remaining_life = (current_wt - min_required_wt) / corrosion_rate
    return True, f"PASS: {remaining_life:.1f} years remaining"
```

## Best Practices

- **Conservatism**: When data is missing (e.g., actual corrosion rates), use conservative estimates from standards (e.g., Norsok M-506).
- **Trend Analysis**: Use historical inspection data (UT/ILI) to validate corrosion models.

## Resources
- **Legacy Projects**: `/mnt/ace/docs/disciplines/integrity_management/projects/`
    - `31519_fmog_marlin_ttr_life_extension`
    - `0185_ecs_ffs_engineering`