Dynamic balancing

I. Determine whether it is a rigid rotor or a flexible rotor based on the operating speed and critical speed. II. A rigid rotor only requires low-speed dynamic balancing ； It is best to perform high-speed dynamic balancing on flexible rotors, but low-speed dynamic balancing can also be used. III. Before performing high-speed dynamic balancing, low-speed dynamic balancing verification must be carried out first. IV. The dynamic balancing method can be selected based on the compressor medium and its importance. V. Low-speed dynamic balancing does not require the use of specialized tooling, resulting in low costs; it can generally be completed within a day ； High-speed dynamic balancing requires expensive tooling, but it can be completed within a month if things are rushed.

1. Rotor corrosion, resulting in dynamic imbalance. 2. Adhesion of viscous substances to the rotor, causing dynamic imbalance. 3. Water present in the oil, along with uneven vaporization of oil and water, leading to vibration. 4. A large gap between the shaft and the bearing shells can also cause dynamic imbalance. 5. Excessively high or low oil pressure can also have an impact. 6. Are there any loose components among the other attached parts?

If there is a problem with the journal, contact the manufacturer or a facility capable of performing repairs first; after the journal is repaired, the rotor should be subjected to high-speed dynamic balancing.

Whether it is a rigid rotor or a flexible rotor, once high-speed dynamic balancing or low-speed dynamic balancing is chosen, it means that either method can be used； It’s just that there should be guidelines regarding whether high-speed dynamic balancing or low-speed dynamic balancing is necessary. The reason is that after performing low-speed dynamic balancing, high-speed dynamic balancing might still require adjustments; similarly, after high-speed dynamic balancing, low-speed dynamic balancing will also need corrections. This is determined by the level of imbalance allowed according to the technical specifications – some cases may meet the requirements per API standards while others will require adjustments. Damage to the shaft necks is caused by imbalance, which stems from misalignment, so repairs are necessary. I’m trying to save costs and am considering whether to perform only high-speed dynamic balancing or first do low-speed dynamic balancing. Thank you! ! !

I agree with the statement above that \"rigid rotors only need low-speed dynamic balancing, while flexible rotors are best balanced at high speeds.\" We are facing the same issue, which is the need for high-speed dynamic balancing.

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