Miner’s rule remains the most used fatigue damage accumulation approach in the oil and gas industry.

Part 2 of this three-part series on brittle fracture focuses on methods for evaluating the risk in pressure equipment and the evolution of screening and assessment methods.

Failure of internal attachment welds became a chronic issue for an NGL plant. Identifying design discrepancies was key to eliminating repeated failures.

Real-world cracks don’t often resemble the idealized cracks on which fracture mechanics solutions are based. This is when categorization rules come into play.

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.

Our proprietary furnace tube inspection system, FTIS is an ultrasonic inspection technology capable of rapid, automated fired heater coil inspection in refinery fired heaters. The data captured by our furnace tube inspection system is...

This article describes a storage tank built in a permafrost area and how FFS and FEA were used to address the challenges of foundation instability.

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

This installment of Damage Control outlines the FFS methods available to analysts for evaluating wall loss such as sulfidation or high-temperature H2/H2S corrosion in pressure equipment

Common pitfalls in gathering inspection data using a case study where additional data gathering resulted in a significant improvement in FFS results.

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.

In today's chemical and refining industries, sustained long term reliability of facilities is critical to profitability and competitiveness. In fact, history shows that differences in operating expenses between best-in-class refineries, and poor...

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

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

Part 2 of this Damage Control series on high-temperature creep discusses engineering evaluation methods that can be used to predict the remaining creep life of components. Comparisons between the Larson-Miller Parameter and the MPC Omega are offered.

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

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.

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The assessment procedures in API 579 may also be applied to pressure-containing equipment constructed to other recognized codes and standards. The author will examine the application of these procedures to aboveground storage tanks.

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

Part 2 of the three-part series on stress corrosion cracking (SCC) that examines common engineering and FFS methods that can be leveraged to understand and evaluate the propensity for an existing form of SCC to lead to loss of containment.

An informative discussion with David Osage, President and Principal Engineer at The Equity Engineering Group, regarding the recent update to API 579/FFS-1, Fitness-for-Service, and why it's important to our industry.

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.

Traditional pressure vessel inspections often require taking assets out of service. However, MISTRAS’ Non-Intrusive Inspection (NII) programs provide data as good or better than internal inspections, while assets remain in service. NII is...

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.

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.

This issue of Damage Control offers a perspective on how to assess the different forms of wet H2S damage using modern FFS and computational analysis techniques with the safe operation of damaged pressure vessels, piping, and associated components.

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.

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.

Traditional, paper-based inspection processes can prevent plants from being as effective as they can be. By digitalizing your mechanical integrity process and data with MISTRAS Digital®, plants have realized up to 75% gains in IDMS data entry and...

In this article, FFS assessment methods are summarized and practical guidance is offered for qualifying CUI damage on carbon and low-alloy steels.

Globally accepted FFS procedures for non-metallic components, such as reinforced thermoplastic pipes, do not exist. There may be opportunity in adapting existing procedures for metallic components and their damage mechanisms to composite components.

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.

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.

Conventionally, three primary fatigue analysis methods have been used to estimate fatigue life; these are the stress-life (S-N) approach, the strain-life (ε-N) approach, and the fracture mechanics (crack growth) approach.

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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.

A summary of some of the important topics that were discussed at the API Fall 2020 Refining and Equipment Standards Meeting that was held via virtual conferencing.

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.

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?

This article provides an overview of brittle fracture, details on several industry failures, and a summary of deficiencies and concerns with current published methods for screening susceptibility of equipment to potential brittle fracture failures.

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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.

A summary of some of the important topics that were discussed at the API Spring Refining and Equipment Standards Meeting that was held via virtual conferencing.

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.

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.

A summary of some of the important topics that were discussed at the API Fall Refining and Equipment Standards Meeting in Atlanta.

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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...

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.

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

This blog article provides examples on addressing widely scattered pitting through the performance of a fitness-for-service assessment using the three conditions set out in the API 510 Pressure Vessel Inspection Code.

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...

Contact us at buddy@dimate.de to learn how DIMATE PACS digitizes NDT methods (RT, UT, VT, ...) and how it leads to paperless inspections.

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.

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.

An effective RBI system implementation results in, not only safeguarding your assets & people, but can also reduce unnecessary inspection activities that may be required due to conventional & nonsystematic approaches.

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.

A quick summary of some of the important topics that were discussed at the Fall Meeting, including the upcoming API Inspection and Mechanical Integrity Summit, subcommittee activities, and progress with the API Individual Certification Program.

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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...

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.

This article details the experience an oil company had when using FEA to evaluate the implications of a damaged pipeline. Specifically, it presents an efficient method that combines analytical techniques with FEA to determine the pipeline’s...

There is concern in the industry over recent findings of reduced toughness fittings and flanges at risk of brittle fracture. This article provides an overview; possible contributors; measures taken to address; and a proposed FFS approach to address...

Given the concern throughout industry regarding the potential for brittle fracture failures, PWHT guidance to address potential issues arising from the recent changes in PWHT code requirements for carbon steel is examined in this article, and...

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In-service equipment failures present a considerable challenge to reliability engineers. This article presents a case study of a convection tube failure in a furnace and the analyses that were performed to understand the root cause and determine the...

This article exhibits how modern inspection methodologies combined with innovative computational analysis practices demonstrate the value of conducting fitness-for-service (FFS) assessments on sectional piping.

This article summarizes a recent finite element analysis (FEA)-based study that employs creep simulation techniques to investigate the elevated temperature response of piping with peaked longitudinal weld seams.

Asset managers need to know when repairs and replacement are required for many reasons, including safe operation, accurate budgeting, replacement planning, and on-going reliability. When predicting design life based on a simple, linear corrosion...

There are numerous benefits to adding fitness-for-service (FFS) assessments to energy sector reliability projects. The acceptance of API 579/ASME FFS-1 is increasing across the energy sector and other industries, as these benefits have been...

Meet our team at booth #1652 where we will be showcasing DIMATE PACS and our latest AI advancements. Our cutting-edge software is designed to revolutionize the way energy companies conduct inspections, improve asset safety, and increase margins.

Maintaining mechanical integrity for aging power boilers can be challenging. This article provides a case study on how mitigating one damage mechanism led to the discovery of another, and how refinery engineers collaborated with industry experts to...

While there are many types of damage mechanisms that can occur in a piece of equipment, localized metal loss is one of the most common. If an inspection reveals that metal loss has occurred, many questions are raised...

Auto-refrigeration is a process where an unintentional and/or uncontrolled phase change of a hydrocarbon from a liquid state to a vapor occurs, resulting in a very rapid chilling (refrigeration) of the liquid containing local equipment and/or...

Even though oil and gas pipelines and their related facilities are generally safer for people and the environment compared to other means of transportation, occasional leaks and failures due to corrosion and other defects have become an issue in...

The assessment procedures in this Standard can be used for Fitness-For-Service assessments and/or re-rating of equipment designed and constructed to recognized codes and standards, including international and internal corporate standards.

The assessment procedures in this Standard can be used for Fitness-For-Service assessments and/or re-rating of equipment designed and constructed to recognized codes and standards, including international and internal corporate standards.

In May of this year, a workshop was presented at the annual NPRA Reliability and Maintenance Conference at the George R. Brown CC in Houston. This article is a reader’s digest summary of what was presented at that workshop by the four...

This bulletin is part of a series of WRC Bulletins that contain the technical background and other information to evaluate damage mechanisms in various industries to facilitate the use of API 579. These bulletins, shown below, will be updated based...

API is preparing to release the next edition of API 579 Fitness-For-Service (FFS) the first quarter of 2006. The many major enhancements that have been made to the next edition of API 579 will permit Owner-Users to evaluate new types of damage...

Several new API inspection recommended practices exist in which inspectors need to be knowledgeable and qualified. This article details some of those standards.

We have discussed various factors that can affect the reliability of NDE techniques (i.e., probability of detection - POD and sizing accuracy) in Part 1. In general, it is difficult to quantify these uncertainties. In fact, it is impossible to fully...

The release of API RP579 will bring about some changes to other existing API standards. The plan is to offer an integrated suite of API standards, where information is presented once and the other documents refer and are linked to that information.