Torsion Vibration Measurement and Analysis of Flue Gas Fan

Torsion Vibration Measurement and Analysis of Flue Gas Fan Torsion vibration can influence the operability and technical life of drive systems such as fan-motors or automatic trains. Typically, torsion vibration is weakly coupled (in the XYZ direction) with axial vibration when the drive system is straight. It can be nearly impossible to detect torsion vibration from axial vibration measurement because of this weak coupling. This section discusses various ways to detect the presence of torsion vibration and how to quantify torsion vibration when troubleshooting. The phrase torsion vibration...

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Slugging Pulsating Pressure Source Characteristic & Measurement

Multiphase Slugging Pulsating Pressure Source Characteristic & Measurement   Slugging in multiphase flows can be caused by a variety of factors (see here and here ), including from pigging operations, operational conditions, where low flow velocity cause mixtures to separate (terrain-induced slugging), or low points where liquids at sufficiently high flow flood the low point cross section and cause periodic slugging (also known as riser slugging), as seen in Figure 1. Periodic slugging can be detrimental to piping fatigue, as it causes large pressure pulsations in the system....

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Boiler pressure pulsation measurement

A boiler (pressure) pulsation measurement can be made directly by using piezoelectric pressure transducers that are installed into the boiler wall, as seen in Figure 1. Boiler pulsation can also be picked up indirectly using accelerometers placed on the boiler wall, though this setup is limited when compared with the use of pressure transducers, as seen in Figure 2. Comparing the boiler pulsation measurements to known boiler data such as power, gas flow velocity, and so on allows for the assessment of root cause problems such a Vortex Induced Vibration (VIV) on heat exchanger pipes, acoustic...

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Small Bore – a Low Cost Element that can become very costly

Piping vibration can be troublesome in itself. Small Bore Fittings (a.k.a. Appurtenences) can be worse and usually are the things that first fatigue and break on a piping system and thereby add system risk. There exists vibration fatigue risk criteria for piping vibration failure. These usually are expressed as vibration velocity for the simple reason that it is vibration velocity that is proportional to mechanical stress at resonance, i.e. at the a frequency where we expect vibration/stress to be the highest. Here is a small derivation as to why vibration velocity is proportional to...

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