Sketch
Javascript is disabledJavascript is disabled on your browser. Please enable it in order to use this form. Loading Analyst & Project Information General Information Machine 1 Vibration Isolation & Response Analysis Analyst Write here Write here Write here Write here Project Information Project Name Write here Other Information Write here Date Time Title Click here Analysis Type Select* NORSOK S-002 ( 1 - 80 Hz) ISO 2631 (1 - 80 Hz) General Case Fmin [Hz]* Write lowest analysis frequency here Fmax [Hz]* Write highest analysis frequency here Frequency Analysis Technique Select* Direct Analysis...
read moreDesigned Damping
Damping design Many people confuse damping with amplitude reduction. To clarify and define, damping is a process in which vibration energy is converted into heat. This conversion process is nearly perfectly irreversible. In other words, we rid ourselves of vibration energy that is converted into heat. The vibration made when a pipe steel structure is impacted by a hammer blow, as sensed by a triaxial accelerometer, can be heard here: The vibration of the same steel structure with damping added can be heard here: The difference in damping between the two cases is...
read morePiping Vibration Fatigue Risk Assessment
Vibration is not really what we want to thoroughly assess piping vibration risk –we should instead use mechanical stress range and load cycles to estimate the risk for vibration fatigue. There is an established methodology where mechanical stress range is assessed with respect to fatigue risk with the help of so called SN-data, where S signifies Stress range (Pk-Pk) and N is the Number of load cycles. A combination of stress ranges and load cycles can be added together using Miner’s rule to assess fatigue risk and estimate a pipe’s lifetime. Link Given this, why do we measure...
read moreFlow Induced Noise
To design robust process industry systems that are insensitive to flow induced pulsation, one must first understand the aeroacoustic mechanisms involved, which can be come rather heavy on theory. Perhaps a simpler way is to understand how wind instruments generate sound and then simply avoid replicating these mechanisms in process equipment? Most people know that blowing across the edge of a bottle produces a tone and many people may have noticed that the masts and wires of a sailboat sing. The phenomena that make up the above observations are referred to as flow acoustics, aeroacoustics or...
read morePulsation Measurement
Correctly measuring pulsation is more difficult than it seems. As mentioned elsewhere (Link), Pressure = LinePressure + Kinetic Pressure + Pulsation. Line Pressure (LP) usually is measured without much problem. LP can be affected by Pulsation when long tubing leads to the pressure sensor (see Figure 1). Industry-type pressure sensors tend to be placed on a small bore fitting, often with a blocking valve situated between the pressure sensor and the flange (see Figure 1- flange not shown). This setup works for Line Pressure and suppresses Kinetic Pressure, but is less ideal for pulsation...
read more