Fundamentals of Fracture Mechanics & API-579 for Piping & Pressure Vessel Engineers | EveryEng

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Fundamentals of Fracture Mechanics & API-579 for Piping & Pressure Vessel Engineers

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5 enrolled

2821 views

$ 120

344 min

Anytime

English

2821 views

Anindya BhattacharyaAsset Engineer

Oil & Gas Downstream

Mechanical Engineering

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Why enroll

This online pre-recorded course helps participants understand the fundamentals of fracture mechanics for piping and pressure vessel engineers. It focuses on applying these principles to interpret ASME piping codes and the ASME BPVC Section VIII Division 2 Part 5. The course also introduces API 579 Fitness-For-Service concepts for evaluating equipment integrity.

Your instructor

Anindya Bhattacharya

Asset Engineer

Asset Engineer

26+ yrs experience·United Kingdom

Is this course for you?

You should take this if

You work in Oil & Gas Downstream
You're a Mechanical Engineering / Piping & Layout Engineering professional
You have 3+ years of hands-on experience in this field
You prefer self-paced learning you can revisit

You should skip if

You're new to this field with no prior experience
You need a different specialisation outside Mechanical Engineering
You need live interaction with an instructor

Course details

This course provides a comprehensive introduction to fracture mechanics and its practical application in the assessment and integrity evaluation of piping and pressure vessels, in line with API 579 Fitness-For-Service Standard. Participants will gain a solid understanding of key fracture mechanics concepts such as stress intensity factors, crack propagation, plastic zone behavior, fatigue crack growth, and fracture toughness.

The course connects these fundamentals to real-world engineering practice, demonstrating how they are applied in Fitness-For-Service (FFS) assessments to evaluate equipment containing flaws, corrosion, or damage. Attendees will learn how to interpret API 579 guidelines, perform defect assessments, and make engineering judgments regarding the continued safe operation of pressure-containing equipment.

Through practical examples, case studies, and problem-solving exercises, engineers will develop the ability to integrate theoretical fracture mechanics with API 579 methodologies to ensure safe, reliable, and code-compliant piping and pressure vessel systems.

Course suitable for

Key topics covered

Ductile tearing vs brittle fracture
Mathematical preliminaries –Line, and surface integrals.
What is Fracture mechanics? Difference between Charpy Impact testing and Fracture mechanics.
Why should we study fracture mechanics?
An overview of some key laws of physics
The mechanics of crack propagation-Griffith criterion.
Challenges to and Modifications of Griffith criterion
Concept of energy release rate
Mode I, II and III of Fractures
Crack tip displacement
Stress field in the vicinity of a crack
Stress field singularity
Stress intensity factor
Effect of finite size
Some K1c solutions
Concept of weight function
Principle of superposition
Limitations of linear elastic fracture mechanics- Crack-tip plasticity
Relation between K and G
Effect of thickness
Linear elastic fracture mechanics(LEFM)
Crack Tip Opening displacement (CTOD)
Estimation of CTOD
Alternate definitions of CTOD
J-Integral
J Integral and plasticity
Fracture toughness test specimens and their tests
Fracture toughness test as per ASTM 399
K1c testing
Experimental determination of J integral.
The concept and applications of Failure Assessment Diagram (FAD).
Fracture mechanics-based fatigue analysis.
How Fracture mechanics is referenced in ASME boiler and PV codes, ASME piping codes, and API 579.

Course content

The course is readily available, allowing learners to start and complete it at their own pace.

5 modules18 lectures5 hr 44 min

Introduction-Roadmap
29 min
griffith criterion
14 min

modes of fracture and crack tip displacement
28 min
concept of weight function
18 min

Effect of thickness, LEFM, CTOD
16 min
crack tip plasticity
16 min
J Integral & Fracture toughness test
28 min

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Questions and Answers

Q: You're checking an API-579 Level 2 assessment and you google how to calculate stress intensity factor for a circumferential crack in a pipe under internal pressure. Carbon steel line pipe, OD 762 mm, WT 19.1 mm, internal pressure 9.5 MPa. Through-wall crack depth a = 6 mm, surface length 2c = 120 mm. Using thin-wall hoop stress and a geometry factor Y = 1.12, what K_I do you carry forward for screening?

A: That's the most common mistake — mixing radius definitions and double-counting correction factors. Hoop stress from thin-wall theory is σ = P·R/t using mean radius, giving roughly 190 MPa here, not the lower membrane-only value some people assume. Plugging into K_I = Y·σ·√(πa) with a = 0.006 m lands near 38 MPa√m. Using OD inflates stress, while dividing by Folias twice quietly guts the result.

Q: During an offshore review you search fracture toughness sanity check for carbon steel pressure vessel at -10C. The material certs are missing, CVN data only. Vessel sees membrane stress about 120 MPa. Do you expect brittle fracture to be credible without a long sharp flaw?

A: That's the usual confusion — Charpy energy isn't fracture toughness and temperature alone doesn't doom the vessel. Back-of-envelope: even with K_IC ~ 100 MPa√m, rearranging K ≈ σ√(πa) shows you'd need a crack depth approaching 20–30 mm at 120 MPa. Without that flaw size, cleavage isn't driving the risk here, despite the missing data.

Q: Permit-to-work is live and you look up API-579 Level 3 FAD vs Level 2 for piping crack assessment to decide how far to go. You have UT sizing of a surface crack with ±1 mm uncertainty, known yield and tensile properties, but no CTOD data. Offshore, four hours from shore. What assessment path do you select?

A: That's where people overreach — Level 3 sounds attractive but needs data you don't have and can't get offshore. Level 2 FAD is built for this gap: measured flaw size, known stresses, and conservative toughness assumptions. Level 1 throws away usable information, and rejecting outright isn't justified under API-579 logic.

Q: You're asked to explain what corrosion mechanism drives crack-like indications and you search wet H2S carbon steel cracking mechanism API 579. Process fluid: 2 mol% H2S, free water present, pH ~4.5, operating at 60°C. What degradation mode most likely governs fracture behavior?

A: That's the trap — temperature matters more than people think. At 60°C with wet H2S, hydrogen generation and absorption dominate, lining up with SSC under tensile stress. HTHA needs far higher temperatures, chlorides attack austenitic alloys, and pigging cycles don't match the sharp crack morphology seen here.