Pipe vibration testing and analysis pdf

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pipe vibration testing and analysis pdf

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JavaScript is disabled for your browser. Some features of this site may not work without it. Piping Vibration Analysis. Author Wachel, J. Metadata Show full item record. Abstract Excessive piping vibrations are a major cause of machinery downtime, leaks, fatigue failures, high noise, fires, and explosions in refineries and petrochemical plants.

Excessive vibration levels usually occur when a mechanical natural frequency of the piping system is excited by some pulsation or mechanical source. Simplified methods are presented for analyzing lateral and shell wall piping vibrations and judging their severity. The methods are thought to be conservative and are intended to be used as screening criteria to determine if more sophisticated analyses, such as computer stress modelling or strain gage testing are necessary.

Frequency factors for calculating the mechanical natural frequencies for the classical piping configurations uniform straight beams and various piping bend configurations are presented.

Factors are presented to compensate the natural frequency calculations for concentrated and distributed weight effects. The relationships between piping vibration displacement, velocity and stress are presented and criteria for judging the severity of piping vibration in terms of the endurance stress limit are shown. The mechanisms that can excite piping vibrations will be discussed, as well as methods for controlling their severity.

Description Tutorial pg. Subject Turbomachines. Collections Turbomachinery and Pump Symposia. Wachel, J. Buddy ; Morton, Scott J. Piping Vibration Analysis.. Turbomachinery Laboratories. Search OAKTrust. This Collection. Login Register. View Usage Statistics. Help and Documentation.

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Ridens, Brandon L. This paper explores new analysis techniques and mitigation concepts developed to extend the current state of the art acoustic induced vibrations AIV analyses. These new methods are intended to provide more accurate evaluations of this phenomenon in an attempt to solve AIV problems found in blowdown and piping systems. Computational fluid dynamics simulations and finite element analysis in combination with lab testing of novel mitigation options using accelerometers, dynamic pressure transducers, and strain gages were performed to better understand the phenomenon and develop possible solutions to reduce the impact of AIV on piping systems. Results of the testing and analyses performed at the Southwest Research Institute SwRI indicate that there is a possible correlation with acoustic modes, structural modes, and elevated stresses during AIV events. Minor reductions in dynamic pressure fluctuations throughout piping during AIV events can be made by changes in valve geometry and piping configurations. Results of CFD modeling and analysis demonstrate that computational analysis can be used to evaluate mitigation strategies and suggest that the use of a dampener as a mitigation technique may be successful in reducing the amplitudes of dynamic pressure waves in piping systems caused by AIV events.


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Olson, DE. Rao, KR. ASME Press,

Vibrations due to mechanical excitation and internal and external fluid flow can cause fatigue in pipelines and leaks in fittings. A beam-based dynamic vibration absorber beam DVA is a device comprising an L-shaped beam with a concentrated mass at its free end that can be used to absorb and dissipate vibrations in the pipeline. In this paper, a mathematical equation is extracted to design the beam DVA using the dimensional analysis DA method and data recorded from experimental tests.

126845008 Pipe Vibration Testing and Analysis

Common Causes Of Piping Vibration And Its Effects On Piping Systems

When the steam is returned to the line, a slug of water will be pushed through the piping, resulting in large axial loads at each elbow. Effects of transient vibrations are usually obvious; large pipe deections usually occur that damage the support system and insulation as well as cause possible yielding of the piping. Of course, damage can also be sustained by the associated equipment, valve operators, drain lines, and so forth. An example illustrating the striking nature of dynamic transients occurred in a fossil fuel plant cold-reheat line. There, the low-point drains had not been properly maintained, and water accumulated in the line after a turbine trip. When the turbine-stop valves were opened, a water slug was forced through the piping, resulting in a transient so severe that the 80 ft.

In this paper, implementation of soft sensing technique for measurement of fluid flow rate is reported. The objective of the paper is to design an estimator to physically measure the flow in pipe by analysing the vibration on the walls of the pipe. Commonly used head type flow meter causes obstruction to the flow and measurement would depend on the placement of these sensors. In the proposed technique vibration sensor is bonded on the pipe of liquid flow. It is observed that vibration in the pipe varies with the control action of stem.


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Pipe Vibration Testing and Analysis

Shock and Vibration

Piping Vibration Analysis and monitoring is important to the success and efficiency of any piping system. Excessive vibration can lead to some practical problems. Flanges may start leaking. Pipes can be knocked off their supports or result in pipe fatigue failure. Piping design codes have been created to help engineers design more efficient piping systems. However, since design is a vast subject and every process and plant is different, most of the piping codes are somewhat inadequate to deal with vibration analysis.

Report Download. When the steam is returned to the line, a slug of water will be pushed through the piping, resulting in large axial loads at each elbow. Effects of transient vibrations are usually obvious; large pipe deections usually occur that damage the support system and insulation as well as cause possible yielding of the piping. Of course, damage can also be sustained by the associated equipment, valve operators, drain lines, and so forth. An example illustrating the striking nature of dynamic transients occurred in a fossil fuel plant cold-reheat line. There, the low-point drains had not been properly maintained, and water accumulated in the line after a turbine trip.

126845008 Pipe Vibration Testing and Analysis

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  • ASME_Ch37_pqxd 10/15/08 PM Page 1 CHAPTER 37 PIPE VIBRATION TESTING AND ANALYSIS David E. Olson PIPING VIBRATION. Quirino B. - 31.03.2021 at 22:33
  • Reporte de evauacion se cundaria pdf the minds eye book pdf Casta C. - 01.04.2021 at 22:26

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