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
MaterialsReviewEngine NORSOK M-001/M-506, ISO 15156, API 581/583, API 941 Process-wide materials review from process simulation and STID/material registers
NorsokM506CorrosionRate NORSOK M-506 CO2 corrosion rate prediction (mm/yr)
NorsokM001MaterialSelection NORSOK M-001 Material grade recommendation and corrosion allowance
SourServiceAssessment ISO 15156 / NACE MR0175 Sour region classification, SSC/HIC/SOHIC risk
CO2CorrosionMaterialSelection NORSOK M-001 / EFC 17 CRA selection hierarchy based on CO2 corrosion rate
ChlorideSCCAssessment NORSOK M-001 / MTI 15 Chloride stress corrosion cracking risk for stainless steels
OxygenCorrosionAssessment NORSOK M-001 / NACE SP0499 Dissolved oxygen corrosion and pitting assessment
DensePhaseCO2Corrosion DNV-RP-J202 / ISO 27913 CCS pipeline corrosion — impurity limits, free water risk
AmmoniaCompatibility CGA G-2.1 / ASME B31.3 Ammonia service material compatibility and SCC assessment
HydrogenMaterialAssessment API 941 / ASME B31.12 Hydrogen embrittlement and HTHA assessment
NelsonCurveAssessment API 941 8th Ed High-temperature hydrogen attack (HTHA) Nelson curve check

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.

For asset- or project-level review packages, see the Process-Wide Materials Review, which combines process conditions, STID/material-register data, degradation mechanisms, CUI screening, remaining-life checks, and MCP integration.

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, CO2CorrosionMaterialSelection, ChlorideSCCAssessment, OxygenCorrosionAssessment
NACE MR0175 / ISO 15156 Sour service classification SourServiceAssessment, NorsokM001MaterialSelection
ISO 15156-2 Carbon steel in sour service SourServiceAssessment
ISO 15156-3 CRA in sour service SourServiceAssessment, CO2CorrosionMaterialSelection
EFC 16/17 CO2/H2S corrosion guidelines SourServiceAssessment, CO2CorrosionMaterialSelection
MTI Publication 15 Chloride SCC guidelines ChlorideSCCAssessment
NACE SP0499 Corrosion in water injection OxygenCorrosionAssessment
DNV-RP-J202 CCS pipeline corrosion DensePhaseCO2Corrosion
ISO 27913 CO2 transport by pipeline DensePhaseCO2Corrosion
CGA G-2.1 Ammonia piping/equipment AmmoniaCompatibility
ASME B31.3 / B31.12 Process piping / H2 piping AmmoniaCompatibility, HydrogenMaterialAssessment
API 941 Nelson curves / HTHA HydrogenMaterialAssessment, NelsonCurveAssessment
API 581 / API 583 CUI and risk-based inspection screening MaterialsReviewEngine, CUIRiskAssessment