We can talk about how far the shaft moves up or down or side to side under the influence of the mass(displacement). We can talk about fast it is moving (velocity) or we can talk about how fast it is speeding up or slowing down (acceleration). What is the relationship between the number of pump impeller and diffuser vanes and the vibration produced by the pump? Also OEM recommends above chart as their threshold in their design documents. This Flash® simulator will let you play with characteristics of an A.C. induction motor. Refer to severity in Figure 1 with amplitude on the left-hand side and frequency along the bottom in Cpm. Some of these machines can be coupled rigidly or flexibly, or connected through gears. ISO 10816 DVA Metric – interactive vibration severity chart. Accurate flow rate is crucial for pump efficiency. As you increase the speed, the wavelength of the sine wave decreases. Vibration severity chart with frequency as follows: Left - Velocity In/Sec Peak, Bottom - Frequency in CPM, Top Diagonal Down - Displacement Mils – Peak-Peak. You can move the location of the trial weight and change its mass. Cross reference amplitude and the frequency is on the boundary of danger failure near. They generate pumping frequencies due to flow and recirculation (i.e., number of vanes multiplied by rpm for centrifugal/turbo pumps or number of screws, lobes or axial piston for positive displacement pumps). When evaluating the general vibration of the the is generally tested [mm/s] (frequency bandwidth between 10Hz and 1000Hz).

This interactive ISO vibration severity chart provides vibration limits in units of velocity for typical machines. There are several standards and guidelines for determining severity of machine vibration as shown in Table 1. report form. This Flash® program allows you to calculate bearing defect frequencies and then view them in a spectrum. Go to the left-hand side, amplitude In/Sec Peak, and look up 0.8749 In/Sec Peak which indicates danger failure near. Examples of these types of machines are small, direct-coupled, electric motors and pumps, production motors, medium motors, generators, steam and gas turbines, turbo-compressors, turbo-pumps and fans. Typically, this chart provides a level of certainty that would allow the analyst to look at the vibration levels, and if acceptable, move onto the next machine for analysis. Brian is certified in Vibration Analysis Level II; is an American Bureau of Shipping Recognized Condition Monitoring External Specialist; and is  a member of Vibration Institute, Society of Maintenance Professionals and ASNT.