Greg Garic: About the Author
Principal, Stress Engineering Services, Inc.

Greg Garic

Mr. Garic has over 40 years of experience in pressure systems engineering, particularly in the fitness-for-service assessment of fixed equipment in chemical plants and refineries. He is highly experienced in stress analysis, fracture mechanics, finite element analysis, creep and high temperature material behavior. His practice routinely involves evaluation and troubleshooting of a wide range of fixed equipment problems such as corrosion, crack-like flaws, hot spots, creep, deformation, and many other issues.

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Published Articles

July/August 2023 Inspectioneering Journal

The API 579 Committee has been steadily working for 10 years on a procedure to evaluate vibration in piping systems. That long work is about to pay off.

Authors: Greg Garic
May/June 2023 Inspectioneering Journal

A discussion on the rationale for being cautious with an inspection of older vessels and how to decide when such inspection is appropriate.

Authors: Greg Garic
March/April 2023 Inspectioneering Journal

Local thin area (LTA) assessments rarely fail. It happens, but not often. Let’s look at examples of how significant an LTA can be and still pass an assessment.

Authors: Greg Garic
January/February 2023 Inspectioneering Journal

Ferritic materials change in toughness as a function of temperature, but the change is non-linear and happens at different temperatures for different materials.

Authors: Greg Garic
November/December 2022 Inspectioneering Journal

Discussion on the new Annex 9J procedure with examples using the Part 3 exemption curve, the 9J General Procedure, and the 9J Simple Procedure.

Authors: Greg Garic
September/October 2022 Inspectioneering Journal

A closer look at the evolution of remaining strength factors (RSF) from its mention in early papers to the latest edition of API 579.

Authors: Greg Garic
July/August 2022 Inspectioneering Journal

The latest edition of the API 579-1/ASME FFS-1 Fitness-for-Service Code was released at the end of 2021. It seems like a good time to have a conversation with the Chair of that committee, Ben Hantz, to get his perspective on the evolution of FFS.

Authors: Greg Garic
May/June 2022 Inspectioneering Journal

As one of the simpler API 579 FFS assessments, there are relevant criteria to check that are necessary to assess and evaluate laminations.

Authors: Greg Garic
March/April 2022 Inspectioneering Journal

This article discusses some of the common fitness-for-service (FFS) issues plant engineers in the chemical and refining industry are facing and a handful of recommendations on how to improve them.

Authors: Greg Garic
January/February 2022 Inspectioneering Journal

Component type is important when assessing the applicability and limitations of a particular assessment (Part and Level) to a particular component. This article explains the evolution of component type definition over the years.

Authors: Greg Garic
November/December 2021 Inspectioneering Journal

There are many excellent changes and updates in the new edition of API 579, including significant technical changes and improvements. In this FFS Forum article, I’ll go through many of what I believe to be the most important changes.

Authors: Greg Garic
September/October 2021 Inspectioneering Journal

This follow-up article discusses the important topic of establishing Heat Exposure Zones and Level 1, 2, and 3 fitness-for-service assessments following a plant fire.

Authors: Greg Garic
July/August 2021 Inspectioneering Journal

Part 1 presents a brief overview of the process of assessing equipment in a post-fire "return-to-service" effort and discusses some common issues that may arise during that process.

Authors: Greg Garic
May/June 2021 Inspectioneering Journal

This article addresses some of the advantages and disadvantages of acoustic emission testing and discusses a few examples of its typical applications.

Authors: Greg Garic
March/April 2021 Inspectioneering Journal

FFS assessments usually originate from inspection results and often end with a recommended inspection plan. This FFS Forum tries to provide a little better understanding of one particular inspection method: Acoustic Emission Testing.

Authors: Greg Garic
January/February 2021 Inspectioneering Journal

The first two parts of this series covered the basics of fracture mechanics and how the FAD is interpreted. This article touches on a few practical points regarding the application of fracture mechanics in a plant environment.

Authors: Greg Garic
November/December 2020 Inspectioneering Journal

Every fitness-for-service (FFS) assessment must have a well-defined acceptance criterion. For many damage mechanisms, it’s the “remaining strength factor” (RSF). But for crack-like flaw assessment, it’s the Failure Assessment Diagram, or FAD.

Authors: Greg Garic
September/October 2020 Inspectioneering Journal

Fracture mechanics is a branch of engineering that describes the behavior of cracks – how they grow and when they fracture. Fracture of cracks is particularly dangerous because it can happen without warning under normal operating conditions.

Authors: Greg Garic
July/August 2020 Inspectioneering Journal

Assessment procedures in API 579 are organized by damage mechanism. But what happens when different damage mechanisms are in play since the evaluation criteria may not be compatible?

Authors: Greg Garic
May/June 2020 Inspectioneering Journal

There are many places where brittle fracture risk can sneak into your plant and many reasons why a new or revised brittle fracture assessment may be required when reviewing your pressure systems. Don’t overlook this dangerous failure mechanism.

Authors: Greg Garic
March/April 2020 Inspectioneering Journal

FMR is a useful tool in many situations. It allows nondestructive evaluation of the surface microstructure that is entirely adequate in many cases. However, it is not a panacea, and there are many conditions where it is inadequate.

Authors: Greg Garic
January/February 2020 Inspectioneering Journal

There are many sources and occurrences of metal fatigue in the chemical and refining industries. They range from low-cycle thermal stresses in an FCCU, to the relentless pressure cycling of a PSA, to the ultra-high cycles of a rotating pump.

Authors: Greg Garic
November/December 2019 Inspectioneering Journal

A cornerstone of Level 1 and 2 metal loss assessment methods in API 579 is the concept of measuring thickness on a grid and constructing a “critical thickness profile.” These concepts are fundamental to Level 1 & 2 assessments in both Parts 4...

Authors: Greg Garic
September/October 2019 Inspectioneering Journal

MSDs are an important, but often misunderstood, element of FFS analyses. This column will help readers understand what an MSD is and why it is so important to Fitness-For-Service analysis under API 579.

Authors: Greg Garic
July/August 2019 Inspectioneering Journal

This is the second of a two-part column on “Creep.” This second part discusses the approach to creep assessment in plant equipment.

Authors: Greg Garic
May/June 2019 Inspectioneering Journal

This is the first of a two-part column on “Creep”. It presents an engineering overview of the phenomena, answers the question: “What is Creep?”, and provides readers with foundational knowledge for evaluating and managing remaining...

Authors: Greg Garic
March/April 2019 Inspectioneering Journal

Brittle fracture and material toughness issues are important concerns in equipment design and FFS. These issues increase when temporary start-up and shutdown conditions require more detailed assessments than provided for in vessel and piping codes.

Authors: Greg Garic
January/February 2019 Inspectioneering Journal

The distinction between primary and secondary loads is certainly important in analysis of pressure systems. But this distinction is also important for plant operations and reliability engineers to keep in mind when dealing with day-to-day problems.

Authors: Greg Garic
November/December 2018 Inspectioneering Journal

In this edition of the FFS Forum, Greg addresses some issues associated with inspection of vessels that have been in service for a number of decades, and offers some tips for reliability and inspection to follow when inspecting these older vessels.

Authors: Greg Garic
September/October 2018 Inspectioneering Journal

In this column, I touch on what I see as an underused FFS technique for corrosion assessment: point assessment of corrosion – a technique that does NOT require a thickness grid. The reason I find this technique useful is largely because it’s so...

Authors: Greg Garic
July/August 2018 Inspectioneering Journal

API 579-1 is a complex document covering several different types of equipment that may contain flaws or damage. Due to its complexity, this article condenses it into six things you need to know.

Authors: Greg Garic
May/June 2013 Inspectioneering Journal

Predicting the remaining life of components operating in the creep regime is one of the trickiest problems encountered in the fitness-for-service (FFS) world.

Authors: Greg Garic
March/April 2013 Inspectioneering Journal

If an operator finds cracking in a furnace waste heat boiler, excessive thinning in an absorption tower, or severe bulging in a converter, FFS assessments—not standard code analyses—are needed to evaluate the unit’s mechanical...

Authors: Greg Garic

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