Deficient Materials in Hot Reheat Seam Welded High-Energy Piping

2017 ◽  
Author(s):  
Kent Coleman ◽  
Stan Rosinski ◽  
Jude Foulds
Keyword(s):  
Filler Metal ◽  
Damage Mechanism ◽  
High Energy ◽  
Management Program ◽  
Life Assessment ◽  
Thick Wall ◽  
Premature Failure ◽  
The World ◽  
Piping Systems ◽  
American Society

Although failures of seam welded high-energy piping date to about 1970, the utility industry concern about premature failure of longitudinal seam welded piping has been of the utmost importance since the mid 1980’s driven primarily by well publicized piping failures at that time. The major concern is with hot reheat piping, some of which failed catastrophically resulting in substantial costs and personnel injury. Many utilities manage their high energy piping integrity through a combination of engineering analysis and periodic inspections. At many utilities around the world, however, high energy piping has not received the attention that normally occurs after a major failure because the perception is that there have been few failures. EPRI has compiled a database of over 50 failures and large areas of damage in utility piping systems around the world and it does not include the entire utility experience but still demonstrates the need for a diligent high energy piping integrity management program. The investigation of a recent failure in a 42 in. (1066 mm) diameter, 2 in. (50.8 mm) thick wall, ASTM A155 (American Society of Testing and Materials) seam welded hot reheat pipe demonstrated a first of its kind damage mechanism which determined that inappropriate welding filler metal was utilized for at least some of the weld passes resulting in a weldment that was weak in creep. Due to the placement of the incorrect welding filler metal, the failure occurred as a leak instead of a rupture however, the damage on the inside surface of the pipe extended for over 9ft. (2743 mm). This paper presents the results of the failure analysis and life assessment work performed and provides guidance for the rest of the utility fleet.

High Energy Piping Walkdowns in Compliance With ASME B31.1

2021 ◽  
Author(s):  
Marvin J. Cohn ◽  
Robert J. Gialdini ◽  
Osborne B. Nye
Keyword(s):  
High Energy ◽  
Management Program ◽  
Piping System ◽  
Original Design ◽  
Structure Damage ◽  
Qualified Personnel ◽  
American Society ◽  
Position Indicator ◽  
Operating Company ◽  
Spring Support

Abstract This paper discusses high energy piping (HEP) system walkdown requirements and guidelines in compliance with the American Society of Mechanical Engineers (ASME) B31.1 Code. Chapter VII states that the Operating Company shall develop and implement a program requiring documentation of piping support readings and recorded piping system displacements. Guidelines for this program are provided in Nonmandatory Appendix V, para. V-7. The Code also requires that the Operating Company shall evaluate the effects of unexpected piping position changes, significant vibrations, and malfunctioning supports on the piping system’s integrity and safety. These requirements and guidelines have been developed for personnel safety and piping system reliability. The HEP system should be maintained to behave as expected in the original design analysis unless a field change is justified by qualified personnel. The walkdown program should be an integral part of an asset integrity management program, including observations, documentation, evaluations, corrective actions, and countermeasures. A thorough HEP system walkdown includes more than documented hanger readings. It should include visual assessments of possible sagging pipe, unusual pipe slopes, building structure damage, lagging/insulation damage, locked spring hangers, piping interferences, damaged spring coils, loose/missing support fasteners, unloaded rigid supports, bent struts, insufficient hydraulic fluid in snubbers, detached Teflon strips on sliding supports, and confirmation that the current supports are consistent with the original design specifications. If accessible, it should be confirmed that there are no gaps in the sliding supports. This paper illustrates that it is now possible to photographically document spring support position indicator readings from distances up to 30 feet (9.1 meters). Photographic documentation provides higher confidence in the position indicator readings and can resolve many visual documentation discrepancies, such as incorrect support readings, readings from opposite position indicator sides, and parallax issues. If accessible, closer inspections may confirm if a spring support is in fact internally bottomed-out or topped-out. Nonmandatory Appendix V provides recommended hot walkdown and cold walkdown forms. These forms provide additional space for applicable notes. Example photographs of many piping system anomalies and associated documentation are provided in this paper. ASME B31.1 requires that significant displacement variations from the expected design displacements shall be considered to assess the piping system’s integrity.

Remaining Life of High-Energy Piping Systems Using Equivalent Stress

1990 ◽  
Vol 112 (3) ◽  
pp. 260-265 ◽  
Author(s):  
M. J. Cohn
Keyword(s):  
Equivalent Stress ◽  
Creep Damage ◽  
High Energy ◽  
Piping System ◽  
Term Operation ◽  
Flexibility Analysis ◽  
Multiaxial Stress State ◽  
Piping Systems ◽  
System Life ◽  
American Society

Fossil power plant high-energy piping systems operated at high temperatures are subject to creep damage, which is a time-dependent phenomenon. Traditional guidelines, such as the American Society of Mechanical Engineers (ASME) B31.1 Power Piping Code, were developed for plants having design lives in the 25–30 yr regime. Since many of these systems are being operated beyond 200,000 hr, it is important to reconsider the methodology of creep damage analysis to assure reliable long-term operation. Seven high-energy piping systems were evaluated in this study. The analysis of a minimum piping system life due to creep considered two approaches. The first approach used the traditional ASME B31.1 flexibility analysis guidelines. The second approach considered more detailed multiaxial stress state types of evaluations. The various equivalent stress methods used all six load components from the flexibility analysis. In nearly every case, the equivalent stress methods predicted significantly higher stresses. Consequently, the equivalent stress methodology results in 14 to 97 percent lower time to rupture values as compared to the values predicted using ASME B31.1 stresses.

Fitness-for-Service of Longitudinal Seam Welds

2010 ◽  
Author(s):  
Dwight D. Agan ◽  
Marvin J. Cohn ◽  
Henry D. Vaillancourt
Keyword(s):  
Operating Temperature ◽  
High Energy ◽  
Management Program ◽  
Piping System ◽  
Operating Pressure ◽  
Seam Weld ◽  
Piping Systems ◽  
Average Operating ◽  
Operating Temperatures ◽  
Longitudinal Seam

A high energy piping (HEP) asset integrity management program is important for the safety of power plant personnel and reliability of the generating units. Hot reheat (HRH) longitudinal seam weld failures have resulted in serious injuries, fatalities, extensive damage of components, and significant lost generation. The HRH piping system is one of the most critical HEP systems. Since high temperature creep is a typical failure mechanism for longitudinal seam welds, the probability of failure increases with unit operating hours. This paper concludes that some seam welded spools in this specific HRH piping system are more likely to fail earlier than other spools, depending on their actual wall thicknesses and operating temperatures. In this case study, the HRH piping system has operated over 200,000 hours and experienced about 400 starts since commercial operation. There are two separate HRH lines, Lines A and B, for this piping system. The 36-inch OD pipe has a specified minimum wall thickness (MWT) of 1.984 inches. Pipe wall thicknesses were measured in 57 spools. The measured spool MWT values varied from 1.981 to 2.122 inches. On average, Line A operated about 8°F higher than Line B. A comparative risk assessment was performed using the estimated average temperatures and pressures throughout the life of this HRH piping system. Data associated with the reported failures or near failures of seam welded Grade 22 piping systems were plotted as log σHoop versus the Larson Miller Parameter (LMP). The range of log σHoop and LMP values for this unique piping system was also plotted, based on the average operating pressure and the range in the average operating temperatures and the measured spool MWT values. The Line A (with a higher average operating temperature) seamed spool having the lowest measured MWT fell slightly above the threshold line of reported seam weld pipe failures. The Line B (with a lower average operating temperature) seamed spool having the lowest MWT is about 10 operating years from reaching the threshold of reported seam weld pipe failures. The Line A seamed spool having the highest measured MWT is about 8 operating years from reaching the threshold of reported seam weld pipe failures. The Line B seamed spool having the highest measured MWT is more than 18 operating years from reaching the threshold of historical seam weld pipe failures.

The 1970s

2011 ◽  
Author(s):  
Thomas Borstelmann
Keyword(s):  
Civil Rights ◽  
Free Market ◽  
The United States ◽  
Global Perspective ◽  
Retirement Plans ◽  
Free Agency ◽  
The World ◽  
The Disabled ◽  
Oil Crisis ◽  
American Society

This book looks at an iconic decade when the cultural left and economic right came to the fore in American society and the world at large. While many have seen the 1970s as simply a period of failures epitomized by Watergate, inflation, the oil crisis, global unrest, and disillusionment with military efforts in Vietnam, this book creates a new framework for understanding the period and its legacy. It demonstrates how the 1970s increased social inclusiveness and, at the same time, encouraged commitments to the free market and wariness of government. As a result, American culture and much of the rest of the world became more—and less—equal. This book explores how the 1970s forged the contours of contemporary America. Military, political, and economic crises undercut citizens' confidence in government. Free market enthusiasm led to lower taxes, a volunteer army, individual 401(k) retirement plans, free agency in sports, deregulated airlines, and expansions in gambling and pornography. At the same time, the movement for civil rights grew, promoting changes for women, gays, immigrants, and the disabled. And developments were not limited to the United States. Many countries gave up colonial and racial hierarchies to develop a new formal commitment to human rights, while economic deregulation spread to other parts of the world, from Chile and the United Kingdom to China. Placing a tempestuous political culture within a global perspective, this book shows that the decade wrought irrevocable transformations upon American society and the broader world that continue to resonate today.

Fundamentality

2017 ◽  
Author(s):  
Richard Healey
Keyword(s):  
Quantum Theory ◽  
High Energy Physics ◽  
Physical Property ◽  
Natural World ◽  
High Energy ◽  
Quantum Field Theories ◽  
Fundamental Physics ◽  
The World ◽  
Energy Physics

The metaphor that fundamental physics is concerned to say what the natural world is like at the deepest level may be cashed out in terms of entities, properties, or laws. The role of quantum field theories in the Standard Model of high-energy physics suggests that fundamental entities, properties, and laws are to be sought in these theories. But the contextual ontology proposed in Chapter 12 would support no unified compositional structure for the world; a quantum state assignment specifies no physical property distribution sufficient even to determine all physical facts; and quantum theory posits no fundamental laws of time evolution, whether deterministic or stochastic. Quantum theory has made a revolutionary contribution to fundamental physics because its principles have permitted tremendous unification of science through the successful application of models constructed in conformity to them: but these models do not say what the world is like at the deepest level.

Las presencias de la Reto´´rica en la obra de Alfonso Reyes: Esbozo de una evolucio´´n

2003 ◽  
Vol 21 (3) ◽  
pp. 149-174
Author(s):  
Eugenia Houvenaghel
Keyword(s):  
20Th Century ◽  
Spanish America ◽  
Classical Rhetoric ◽  
Spanish American ◽  
Third Phase ◽  
The World ◽  
Alfonso Reyes ◽  
The Subject ◽  
American Society

The Mexican diplomat Alfonso Reyes (1889––1959) was notable in the cultural panorama of Spanish America in the first half of the 20th century for his acquaintance with classical rhetoric, a discipline rarely studied at that time in that part of the world. This article distinguishes four aspects of rhetoric throughout Reyes' oeuvre: (i) a vulgar sense, (ii) an erudite sense, (iii) classical theories, (iv) and modern applications. In his early work, Reyes uses rhetoric in a pejorative and vulgar sense. Around the year 1940, Reyes starts to show a lively interest in rhetoric, opts definitively for an erudite sense of the term, and initiates the study of the classical art of persuasion. In his third phase, Reyes gains deeper knowledge of rhetoric, lectures on the subject, and explains his favorite orators andtheorists. Finally,his use of rhetoric reveals a commitment to the reality of Spanish America. Reyes' rhetoric is an "actualised" and "Americanised" version that shows the possibilities of the classical art of persuasion in Spanish American society.

Status of Cerium Fluoride Performances

1994 ◽  
Vol 348 ◽  
Author(s):  
E. Auffray ◽  
I. Dafinei ◽  
P. Lecoq ◽  
M. Schneegans
Keyword(s):  
Decay Time ◽  
High Energy Physics ◽  
Light Yield ◽  
High Energy ◽  
Radiation Hardness ◽  
Cerium Fluoride ◽  
The World ◽  
Electromagnetic Calorimeters ◽  
Physics Experiments ◽  
Energy Physics

ABSTRACTCerium fluoride offers a reasonable compromise between parameters like the density, the light yield, the scintillation characteristics (particularly the decay time) and the radiation hardness, and is considered today as the best candidate for large electromagnetic calorimeters in future High Energy Physics experiments. Details on the performances of large crystals produced by different manufacturers all over the world and measured by the Crystal Clear collaboration will be shown and the usefulness of a good collaboration between the industry and the users will be highlighted by some examples on the light yield and radiation hardness improvement.

Interrelation between Qai’lullah, Blue Light Exposure and Neurocognitive Performances: A Short Review

2021 ◽  
Vol 02 (02) ◽  
Author(s):  
Nur Farhana Fadzil ◽  
◽  
Siti Amira Othman ◽  
Keyword(s):  
Job Performance ◽  
Blue Light ◽  
Memory Consolidation ◽  
Light Exposure ◽  
Short Review ◽  
High Energy ◽  
Neurocognitive Performance ◽  
Night Sleep ◽  
Visual Contrast ◽  
The World

Qai’lullah or napping is a phenomenon that is widely practiced in the world. Islam advocates mid-day napping as it is primarily practiced by the Prophet Muhammad (pbuh). Scientists and scholars also acknowledge the benefits beyond this practice after various research and studies done. Hence, this article emphasizes topic of sleep in Islamic insight, their stages of sleeps according to Quran and the practiced of Qai’lullah or mid-day napping. The high-energy blue light exposure from the natural source, Sun and also digital screens reported reduce visual contrast and affect the sharpness and clarity by creating glares lead to mental and physical fatigue. Thus, a short nap in the mid-afternoon helps to boost memory, lift our mood, and improve job performance. The effect associated with qai’lullah are also being reviewed including improved the neurocognitive performance, alertness, recover the loss night sleep and enhanced the quality and increased memory consolidation in people.

In-Service Reliability Assessment of Turbine Blade Thermal Barrier Coatings Based on a Novel Cumulative Damage Index Model

2021 ◽  
Author(s):  
He Liu ◽  
Jianzhong Sun ◽  
Shiying Lei
Keyword(s):  
Damage Index ◽  
Cumulative Damage ◽  
Life Assessment ◽  
Thermal Barrier ◽  
Inlet Temperature ◽  
Service Reliability ◽  
Engine Operation ◽  
Premature Failure ◽  
Covariate Data ◽  
Index Model

Abstract Thermal barrier coating (TBC) has been used widely on turbine blades to provide temperature and oxidation protection. With the turbine inlet temperature continuously increasing, TBCs have become more likely to oxide spallation, leading to premature failure of blade metal substrates. Thus, It is necessary to accurately evaluate the in-service reliability of TBCs for blade life assessment and engine operation safety. Nowadays, it is common to dynamically record aero-engine operating and performance data, called dynamic covariate data, which provides periodic snapshots for obtaining reliability information of engine components. Nevertheless, existing TBC life prediction models that pay adequate attention to dynamic covariate information are rare. This paper focuses on using limited failure samples with associated dynamic covariate data to make in-service reliability assessments of TBCs through a proposed cumulative damage index model. For the demonstration of the proposed approach, an integrated TBC life simulation approach has been introduced, which comprises engine performance, blade thermal, TBC damage, and damage accumulation models. The case study shows that the proposed cumulative damage index model based method provides more stable and accurate results than the traditional statistical method based on failure-time data.

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