Flow Induced Vibration of Power and Process Plant Components

2001 ◽  
Author(s):  
M. K. Au-Yang
Keyword(s):  
Flow Induced Vibration ◽  
Process Plant ◽  
Plant Components

Flow-Induced Vibrations in Power and Process Plant Components—Progress and Prospects

2000 ◽  
Vol 122 (3) ◽  
pp. 339-348 ◽  
Author(s):  
D. S. Weaver ◽  
S. Ziada ◽  
M. K. Au-Yang ◽  
S. S. Chen ◽  
M. P. Paı¨doussis ◽  
...  
Keyword(s):  
Future Research ◽  
Two Phase Flows ◽  
Flow Induced Vibration ◽  
Two Phase ◽  
Process Plant ◽  
Fluidelastic Instability ◽  
Flow Induced Vibrations ◽  
Excitation Mechanisms ◽  
Plant Components

This paper provides a brief overview of progress in our understanding of flow-induced vibration in power and process plant components. The flow excitation mechanisms considered are turbulence, vorticity shedding, fluidelastic instability, axial flows, and two-phase flows. Numerous references are provided along with suggestions for future research on unresolved issues. [S0094-9930(00)01203-8]

Process plant condition monitoring and fault diagnosis

1998 ◽  
Vol 212 (1) ◽  
pp. 13-30 ◽  
Author(s):  
M A Sharif ◽  
R I Grosvenor
Keyword(s):  
Fault Diagnosis ◽  
Condition Monitoring ◽  
Research Work ◽  
Process Condition ◽  
Main Process ◽  
Process Variables ◽  
Control Valves ◽  
Process Plant ◽  
Wide Range ◽  
Plant Components

The paper reviews current research work in the field of process condition monitoring and fault diagnosis. The review compares and contrasts the applicability and efficiency of different techniques, and concentrates on methods which monitor the main process variables. From the wide range of methods and process variables, temperature, flowrate and liquid level are used here in comparing the limitations and applications of each method. The scope of the paper ranges from basic, well established techniques to the latest reported monitoring strategies for each of the process variables. Furthermore, the different methods of fault diagnosis deemed to be relevant in process plant are reviewed. The detection of the internal leakage in the control valves and motor faults are discussed in detail, as examples of the monitoring of vital process plant components. The paper then outlines areas of future work, such as the development of a user friendly interface. This interface is based on state transition diagrams (STDs) as well as on the use of a knowledge based system (KBS) to model and diagnose faults in vital process plant components such as control valves.

Preventing Failures by Using No-Tube-in-the-Window (NTIW) Baffling in Feedwater Heater Design

2005 ◽  
Author(s):  
Thomas J. Muldoon
Keyword(s):  
Power Plant ◽  
Heat Exchangers ◽  
Failure Mechanisms ◽  
Flow Induced Vibration ◽  
Pressure Drops ◽  
Process Plant ◽  
Dry Conditions ◽  
High Flows ◽  
Heater Design ◽  
Operational Failure

High and intermediate pressure feedwater heaters increase the thermal efficiency of a power plant. During their lifetime they are subject to many different failure, mechanisms. Some of these failures are attributed to flow induced vibration resulting from operation at high overload conditions and load cycling. No-Tubes-in-the-Window (NTIW) baffle designs have been used for many years in the design of power plant and process plant heat exchangers. This baffle design is typically used in larger units which have high flows are susceptible to failures attributable to flow induced vibration. The NTIW design allows for the inclusion of intermediate supports between baffles that allows the design engineer to “tune” the tubes by increasing their natural frequency to levels above any possible flow condition. Utilizing a NTIW baffle design, several of these operational failure mechanisms can be directly addressed in the design and fabrication stage of a new or replacement feedwater heater. In particular, the NTIW can be designed to have extremely short unsupported spans and excellent vibration characteristics even at the highest predicted loads. The design also incorporates a larger minimum bend radii which minimizes high U-Bend stresses as a result of differential leg expansion. The NTIW design puts the exhaust steam into the steam dome without the wet/dry conditions in the condensing zone area just outside the desuperheating zone. The ability to place intermediate tube supports in the baffle space allows the design engineer to have the flexibility to keep zone pressure drops low, even in high load situations.

Flow-Induced Vibration: Guidelines for Design, Diagnosis, and Troubleshooting of Common Power Plant Components

1985 ◽  
Vol 107 (4) ◽  
pp. 326-334 ◽  
Author(s):  
M. K. Au-Yang
Keyword(s):  
Power Plant ◽  
Vortex Shedding ◽  
Cylindrical Shells ◽  
Leakage Flow ◽  
Flat Plates ◽  
Flow Induced Vibration ◽  
Flowing Fluid ◽  
Vibration Problems ◽  
Tube Banks ◽  
Plant Components

The different techniques of assessing the flow-induced vibration problems of common power plant components are reviewed. The components are divided into categories of single cylinders, flat plates, pipes containing flowing fluid, cylindrical shells, and tube banks. The mechanisms considered include turbulent buffeting, instability, vortex shedding, acoustics, and leakage flow-induced vibration. Emphasis is placed on applications to industrial problems.

Human reliability in non-destructive inspections of nuclear power plant components: modeling and analysis

2019 ◽  
Vol 7 (2B) ◽  
Author(s):  
Vanderley Vasconcelos ◽  
Wellington Antonio Soares ◽  
Raissa Oliveira Marques ◽  
Silvério Ferreira Silva Jr ◽  
Amanda Laureano Raso
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Human Factors ◽  
Nuclear Power ◽  
Power Plants ◽  
Failure Modes ◽  
Cooling System ◽  
Human Reliability ◽  
Non Destructive ◽  
Plant Components

Non-destructive inspection (NDI) is one of the key elements in ensuring quality of engineering systems and their safe use. This inspection is a very complex task, during which the inspectors have to rely on their sensory, perceptual, cognitive, and motor skills. It requires high vigilance once it is often carried out on large components, over a long period of time, and in hostile environments and restriction of workplace. A successful NDI requires careful planning, choice of appropriate NDI methods and inspection procedures, as well as qualified and trained inspection personnel. A failure of NDI to detect critical defects in safety-related components of nuclear power plants, for instance, may lead to catastrophic consequences for workers, public and environment. Therefore, ensuring that NDI is reliable and capable of detecting all critical defects is of utmost importance. Despite increased use of automation in NDI, human inspectors, and thus human factors, still play an important role in NDI reliability. Human reliability is the probability of humans conducting specific tasks with satisfactory performance. Many techniques are suitable for modeling and analyzing human reliability in NDI of nuclear power plant components, such as FMEA (Failure Modes and Effects Analysis) and THERP (Technique for Human Error Rate Prediction). An example by using qualitative and quantitative assessesments with these two techniques to improve typical NDI of pipe segments of a core cooling system of a nuclear power plant, through acting on human factors issues, is presented.

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