Problems. Solved.

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 article summarizes the fundamentals of wet H2S-related damage mechanisms, offers some practical inspection guidance, and reviews a notable industry failure caused by different forms of wet H2S damage.

This article examines the quantitative tank RBI method found in API 581 and discusses uses for tank RBI other than deferral of scheduled internal inspections.

Practical steps to mitigate corrosion under insulation (CUI) damage on fixed pressure equipment and commentary on common mitigation techniques and good engineering practices for external insulation or fireproofing system design and application.

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

This article provides insights into the AIV damage mechanism, reviews approaches to calculate the probability of AIV failure in piping, provides design practices to prevent AIV failure, and introduces a RBI approach to evaluate risk of AIV failures.

Corrosion under insulation is a form of external corrosion that is caused by trapped water on insulated surfaces. It is an industry problem affecting equipment in the oil and gas, petrochemical, specialty chemical, fertilizer, and related industries.

Thermal fatigue, a specific form of fatigue driven by varying metal temperature gradients and ensuing differential thermal expansion, is generally most effectively mitigated by reducing the severity of metal temperature gradients.

“Condition monitoring location (CML) optimization” is a frequently used term, particularly for piping circuits. Everyone wants their circuits to be “CML optimized,” but what does this truly mean?

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.

This article reflects the first in a series on damage mechanisms that will appear in this recurring Inspectioneering column entitled “Damage Control.” The inaugural topic discussed in this column is thermal fatigue.

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.

Much like the equipment and piping they support, structures should be part of a comparable structural integrity (SI) program. This article will examine key components of a comprehensive SI program as an essential companion to an MI program.

This article provides a case study showing the real costs and effects of having a dated engineering standards program, as well as the financial benefits through increased reliability of having a thriving engineering standards program.

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...

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.

When was the last time you reviewed your Risk-Based Inspection (RBI) methodology? Are you using calculation procedures for probability of failure, consequence of failure, and risk that haven’t had their basis reviewed in years?

This article addresses a debate mechanical integrity professionals in the O&G and Chemical Processing industries periodically have about how thickness data gathered during a thickness monitoring inspection (TMI) should be recorded.

The tubes of heat exchangers (HX), whether for a shell and tube bundle or an airfin, are typically subject to some form of nondestructive examination (NDE) to try and quantify the remaining wall thicknesses and corrosion rates to help a plant to...

One of the more common inspection monitoring programs for pressure vessels is to perform thickness measurement at Corrosion Monitoring Locations (CMLs) to allow monitoring of minimum thicknesses and provide estimates for corrosion rates. These...

Small bore piping is present in many variations throughout numerous industries. This article will address an incident involving a small bore piping failure that occurred on a 140,000 BPD crude distillation unit in the refining industry.

This article is the fifth of a series of articles that will focus on one critical sub process within a PEIP that is key in managing the integrity of process piping; Thickness Monitoring Programs for Internal Corrosion.

Piping failures still represent a frustrating and ongoing problem for processing plants. Failures are still commonly reported and contribute to large losses. In the author’s experience, piping represents the highest percentage of fixed equipment...

This article is the third of a series of articles that will focus on one critical sub process within a PEIP that is key in managing the integrity of process piping: thickness monitoring programs for internal corrosion. These articles will discuss...

Piping failures still represent a frustrating and ongoing problem for processing plants. Failures are still commonly reported and contribute to large losses. In the author’s experience, piping represents the highest percentage of fixed equipment...

Piping failures still represent a frustrating and ongoing problem for processing plants (example in Figure 1). Failures are commonly reported and contribute to large losses. As well per the author’s experience, piping still represents the...

This article describes the API Risk-Based Inspection (RBI) methodology for pressure relieving devices (PRDs) as detailed in the soon to be released 2nd edition of API 581 "Base Resource Document On Risk-Based Inspection" This methodology has been...

The following is the final part of a 2-part series outlining the relationship between key operating parameters and corrosion that has been used to develop a set of guidelines to define an operating envelope.

Corrosion and fouling in HF Alkylation Units are closely linked to feed quality and operating conditions. This article outlines the relationship between key operating parameters and corrosion that has been used to develop a set of guidelines to...