CRL 1-hr: Nov 7 Introduction to Uptime Elements Reliability Framework and Asset Management System

  • Used successfully for short rotors such as:
    -overhung fans up to 2m diameter,
    -pump impellers on mandrels (using a pot magnet as the swing weight).
    • Also on smaller fans with two bearings that are nearer to "long" rotors.
    • How used for a 10-stage pump of the ring-section design (where each impeller is assembled in turn with its matching stationary section):
      -Parallel ways were clamped to the bed of a milling machine.
      -Balance correction was made on the adjacent machine using an end milling cutter.
      -A table was calculated and drawn up giving the depth of cut required in each case.
      -Position was marked clearly on the impeller: machinist cut the required mass from the back shroud.
    • Rotor must be in rolling element bearings, or set up on a mandrel and parallel ways, and not affected by crosswinds.
    • For in situ balancing, take usual safety precautions so that the machine cannot be switched on while the work is in progress.
    • Mark numbers around the rotor, evenly spaced. For bladed rotors, mark at the blades.
    • Choose swing weight to fasten (by clamp or magnet) on rotor, to give to-and-fro oscillation time of about 20 seconds. (This gives some allowance for stopwatch reaction time).
    • With the swing weight fixed to rotor at Position 1, rotate the rotor so that the weight is at one horizontal position and stationary.
    • Release the weight and let the rotor swing freely under its own inertia -do not push it in any way.
    • Time the to-and-fro oscillation from the horizontal position.
    • Rotate the rotor so that the weight is at the horizontal position on the other side, and repeat.
    • Take the average time of swing for this position
    • Plot on a graph of time vs position (with position numbers evenly spaced: position 1 appears twice-at the start and the end of the position axis).

    Mean Time of Swing

    • Move swing weight to Position 2, etc. and repeat process.

    Mean Time of Swing

    • Connect the graphed points with a smooth sine wave shape graph, and read off the maximum and minimum timed of swing: T and t.
    • Calculate the size of balance weight required from: - Balance weight = Swing weight ×

    Mean Time

    • Check the result if required by repeating the swing test for 3 spaced points.
    • Make balance weight of the required mass, and fix it on the rotor at position of longest swing time. Allow for mass of weld.
    • If the correction is to be made by removing mass from the rotor, remove it from the position of quickest swing.

    Reader tip provided by, Ray Beebe, Senior Lecturer, Monash University

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