Select a Damage Mechanism

API 571

Explore over 60 damage mechanisms affecting pressure equipment, as per API 571.

API 581

Calculate corrosion rates for CUI, CO₂, sulfidation, and more using RBI methodology.

Find Mechanism

Input process conditions to identify potential damage mechanisms using smart rules.

Representative Fluids

Access a built-in fluid library with properties for risk, release rate, and consequence.

Inventory Calculator

Estimate release mass and leak rates for various shapes and conditions per API 581.

Damage Mechanism Finder Tools

🛠️ Damage Mechanism – Corrosion Rate Estimator

Select Damage Mechanism:

⚙️ Select Damage Mechanism:

🧪 Process Representative Fluids

Select Fluid Group:

Representative Fluid	Applicable Materials	MW	NBP (°C)	NBP (°F)	AIT (°C)	AIT (°F)

No fluids selected. Please choose from above.

🧪 Corrosion Rate Calculator

Base Date:

Base Thickness (mm):

Middle Date (optional):

Middle Thickness (mm):

Last Date:

Last Thickness (mm):

T-Min (mm):

OISD Frequency (Months):

📘 Analysis Output

Controlling Corrosion Rate:

Long Term Corrosion Rate:

Short Term Corrosion Rate:

Scheduled Next Inspection Date:

Interval Next Inspection Date:

Factor Life Date:

Projected Tmin Date:

T-Min Value:

Estimated Life:

📈 Thickness Trend Over Time

API 581 Level 2 – Consequence of Failure Calculator

Storage / Operating Conditions (Sec 4.1)

Storage Pressure, Ps (kg/cm²) Storage Temperature, Ts (°C) Ambient Pressure, Patm (bar abs) Ambient Temp, Tamb (°C) Stored Phase

Fluid Properties

Fluid Density (liquid) ρl (kg/m³) Molecular Weight, MW (kg/kmol) Normal Boiling Point, NBP (°C) Specific Heat Ratio, k (= Cp/Cv) Autoignition Temp, AIT (°C)

Release Geometry / Inventory (Sec 4.2, 4.4)

Release Hole Size Hole Diameter dn (mm) Component ID D (mm) Discharge Coefficient Cd Viscosity Factor Kv Inventory Group Mass (kg) Flash Fraction (0–1) Detection Effectiveness Isolation Effectiveness Release Type

Outcome Model Coefficients (Sec 4.8–4.10)

CA = a·rateᵇ (continuous) or CA = c·massᵈ (instantaneous). Enter API 581 table values.

Continuous (a·rateᵇ)

a_flash b_flash a_jet b_jet a_pool b_pool a_vce b_vce

Instantaneous (c·massᵈ)

c_flash d_flash c_jet d_jet c_pool d_pool c_vce d_vce

Flash-fire equipment-damage fraction

Ignition Probability (auto, Sec 4.11)

Ignition scale k1 Ignition exponent k2 AIT sensitivity k3 Late ignition min fraction Late ignition max fraction

Toxic, Non-Toxic & Financial Parameters

Toxic coeff a (continuous) Toxic coeff b (continuous) Toxic coeff c (instant) Toxic coeff d (instant) Non-toxic coeff a Non-toxic coeff b Non-toxic coeff c Non-toxic coeff d Equipment Damage Cost ($/m²) Injury/Fatality Cost ($/m²) Production Loss Cost ($/m²)

Results

Press "Calculate COF"

Semi-Quantitative

Degradation Mechanism

External Corrosion

Damage Factor

Probability Category

Degradation Mechanism

Internal Corrosion

Damage Factor

Probability Category

Evaluation

Consequence Evaluation

Flammable Consequence Category

Production Loss Category

Toxic Consequence Category

POF \ COF	A	B	C	D	E
5	High	High	High	Extreme	Extreme
4	Medium	Medium	High	High	Extreme
3	Low	Low	Medium	High	Extreme
2	Low	Low	Medium	Medium	High
1	Low	Low	Medium	Medium	High

Toxic % Strict Calculator

Calculation Type: Select Toxic Gas: Total Mass Flow (kg/hr):

Process Piping Thickness Calculator

Design Pressure (P):

Unit:

Allowable Stress (S):

Unit:

Nominal Pipe Size(NPS):

Weld Joint Efficiency (E):

Y Factor Material:

Y Factor (Design Temperature):

High-Temperature Service?

Include Corrosion Allowance?

Include Mill Tolerance?

Calculating...

Required Thickness:

Pressure Vessel – Shell & Head Thickness Calculator

Select Type:

Aggregate Inspection Confidence (AIC) Calculator

Year:

Inspection Type:

Inspection Method:

Equipment Type:

Inspection Category:

Added Inspections

Year	Equipment	Inspection Type	Inspection Category	Inspection Method	Confidence Level	Equivalent	Action

Summary

Total Equivalent: -

Aggregate No. of Inspections (ANI): -

AIC (Confidence): -

Cracking Mechanism Finder

H₂S (ppm):

Free H₂O:

PWHT:

HCN (ppm):

pH:

Chloride (ppm):

Dissolved Oxygen (ppm):

Temperature (°F):

Caustic Concentration (%):

DEA / Amine Present:

Amine Type:

Scale Present:

Operating Stability:

Material Type:

Allowable Stress value

Select Equipment Shape:

Diameter (ID):

Diameter Unit:

Length / Height:

Length Unit:

Features

Select a Damage Mechanism

API 571

API 581

Find Mechanism

Representative Fluids

Inventory Calculator

Damage Mechanism Finder Tools

🛠️ Damage Mechanism – Corrosion Rate Estimator

🧪 Process Representative Fluids

🧪 Corrosion Rate Calculator

📋 CSV Preview

📘 Analysis Output

📈 Thickness Trend Over Time

API 581 Level 2 – Consequence of Failure Calculator

Storage / Operating Conditions (Sec 4.1)

Fluid Properties

Release Geometry / Inventory (Sec 4.2, 4.4)

Outcome Model Coefficients (Sec 4.8–4.10)

Continuous (a·rateᵇ)

Instantaneous (c·massᵈ)

Ignition Probability (auto, Sec 4.11)

Toxic, Non-Toxic & Financial Parameters

Results

Semi-Quantitative

Degradation Mechanism

Damage Factor

Probability Category

Degradation Mechanism

Damage Factor

Probability Category

Evaluation

Flammable Consequence Category

Production Loss Category

Toxic Consequence Category

External Corrosion Probability Calculator

Internal Corrosion Probability Calculator

Consequence Evaluation Calculator

📊 Risk Matrix

Toxic % Strict Calculator

Compound input

Add New Compound input (with custom molar mass)

Compound List and Calculations

Total Mass: 0.000 g

Damage Mechanisms

Damage Mechanisms (CDU / VDU)

Damage Mechanisms (MSP)

Damage Mechanisms (H2U)

Process Piping Thickness Calculator

Pressure Vessel – Shell & Head Thickness Calculator

Cylindrical Shell Inputs:

Ellipsoidal Head Inputs:

Torispherical Head Inputs:

Hemispherical Head Inputs:

Aggregate Inspection Confidence (AIC) Calculator

Added Inspections

Summary

Cracking Mechanism Finder

Allowable Stress value

📥 Bulk Inventory Upload

📦 Inventory Summary