This means that if an accelerometer is connected to the data collector and the display is setup for acceleration units, the low frequency signals are correctly displayed down to 2 Hz. If the accelerometer signal is integrated to velocity or displacement the low frequency limitation is 5 Hz. Similarly, a velocity transducer has the velocity low frequency limitation and the integration limitation also applies. Methodology Piping vibration analysis involves describing how much the pipe is moving and at what frequency the motion exists. The piping motion can be further described by showing the motion as a modal plot.
Pipes can vibration in three orthogonal directions just like a machine.
Vibration data should be collected in the X, Y, and Z axis. The vibration transducer may be attached to the pipe using a magnetic mount without affecting the lower frequency response of the transducer. Collect spectra at each measurement point. Evaluate the spectra for the components at common frequencies noting their amplitude and frequency. Generally, the pipe supports should be a nodal point with little or no motion.