Corrosion Analysis Module

The neqsim.process.corrosion package provides industry-standard corrosion assessment tools for carbon steel and CRA material selection in CO2/H2S environments.

Classes

Class Standard Purpose
NorsokM506CorrosionRate NORSOK M-506 CO2 corrosion rate prediction (mm/yr)
NorsokM001MaterialSelection NORSOK M-001 Material grade recommendation and corrosion allowance

Integration

The corrosion module integrates with the pipeline mechanical design system:

Integration Point Description
PipelineMechanicalDesign Orchestrates corrosion analysis from stream data
Pipeline Convenience methods for corrosion analysis on pipeline equipment

See the Pipeline Corrosion Integration Guide for full workflow.

Quick Start

Standalone Corrosion Rate

import neqsim.process.corrosion.NorsokM506CorrosionRate;

NorsokM506CorrosionRate model = new NorsokM506CorrosionRate();
model.setTemperatureCelsius(60.0);
model.setTotalPressureBara(100.0);
model.setCO2MoleFraction(0.02);
model.setFlowVelocityMs(3.0);
model.setPipeDiameterM(0.254);
model.calculate();

System.out.println("Corrosion rate: " + model.getCorrectedCorrosionRate() + " mm/yr");
System.out.println("Severity: " + model.getCorrosionSeverity());
System.out.println("pH: " + model.getCalculatedPH());

Material Selection

import neqsim.process.corrosion.NorsokM001MaterialSelection;

NorsokM001MaterialSelection selector = new NorsokM001MaterialSelection();
selector.setCO2CorrosionRateMmyr(2.5);
selector.setH2SPartialPressureBar(0.05);
selector.setChlorideConcentrationMgL(50000);
selector.setDesignTemperatureC(80.0);
selector.setDesignLifeYears(25);
selector.evaluate();

System.out.println("Material: " + selector.getRecommendedMaterial());
System.out.println("Service: " + selector.getServiceCategory());
System.out.println("CA: " + selector.getRecommendedCorrosionAllowanceMm() + " mm");

Integrated Pipeline Analysis

import neqsim.process.equipment.pipeline.PipeBeggsAndBrills;

// After running the pipeline simulation
pipe.setDesignLifeYears(25);
pipe.setInhibitorEfficiency(0.0);
pipe.runCorrosionAnalysis();

System.out.println("Rate: " + pipe.getCorrosionRate() + " mm/yr");
System.out.println("Material: " + pipe.getRecommendedMaterial());
System.out.println("CA: " + pipe.getRecommendedCorrosionAllowanceMm() + " mm");

Python (Jupyter)

from neqsim import jneqsim

NorsokM506 = jneqsim.process.corrosion.NorsokM506CorrosionRate

model = NorsokM506()
model.setTemperatureCelsius(60.0)
model.setTotalPressureBara(100.0)
model.setCO2MoleFraction(0.02)
model.setFlowVelocityMs(3.0)
model.setPipeDiameterM(0.254)
model.calculate()

print(f"Corrosion rate: {model.getCorrectedCorrosionRate():.2f} mm/yr")
print(f"Severity: {model.getCorrosionSeverity()}")

Standards Coverage

Standard Scope Implementation
NORSOK M-506 (2005/2017) CO2 corrosion rate model NorsokM506CorrosionRate
NORSOK M-001 Material selection guidelines NorsokM001MaterialSelection
NACE MR0175 / ISO 15156 Sour service classification Both classes
ISO 15156-2 Carbon steel in sour service NorsokM001MaterialSelection
ISO 15156-3 CRA in sour service NorsokM001MaterialSelection