Vibration Standards for Air Compressors

I. Why Should We Pay Attention to Air Compressor Vibration Standards?

During operation, air compressors generate reciprocating inertial forces, airflow pulsations, and vibrations in their transmission components. Excessive vibration can compromise the stability of foundations, piping, bearings, seals, and instrumentation, while also leading to increased noise levels and higher maintenance costs. Consequently, vibration criteria are commonly applied in equipment selection, installation acceptance, condition monitoring, and fault diagnosis.

II. Main Dimensions of Vibration Assessment

• Vibration velocity:It is commonly used to assess the overall vibration level of equipment and is a frequently employed parameter in operational condition monitoring.
• Vibration displacement:It places greater emphasis on low-frequency vibrations and structural sway, making it well-suited for analyzing the condition of foundations or frames.
• Vibration acceleration:It is highly sensitive to high-frequency impacts and early bearing anomalies, making it well suited for condition monitoring and trend analysis.

III. Measurement Location and Operating Condition Requirements

Measurements are typically taken near the bearing housing, machine base, foundation, or pipeline connection points, with consistent measurement locations to facilitate comparison. During measurement, record parameters such as rotational speed, load, discharge pressure, operating time, and ambient temperature. If the equipment is operating under no‑load, loaded, unloaded, or variable‑condition conditions, its vibration characteristics may differ; therefore, evaluations should be conducted under stable operating conditions.

IV. Acceptance and Operation & Maintenance Recommendations

• Priority shall be given to equipment technical documentation, the contract’s technical agreement, and the project acceptance requirements.
• Establish baseline data to facilitate subsequent trend analysis.
• Pay attention to phenomena such as vibration abrupt changes, abnormal noises, loosening of anchor bolts, and pipeline resonance.
• Regularly inspect the condition of the mounting foundation, vibration isolation devices, couplings, and pipeline supports.

V. Common Troubleshooting Approaches for Abnormal Vibration

When vibrations exceed expected levels or exhibit significant changes, troubleshooting should address factors such as the stability of the mounting foundation, alignment deviations, wear of transmission components, abnormal pulsations in the air lines, and loosening of pipeline supports. For equipment in long-term operation, it is recommended to employ trend monitoring rather than drawing conclusions based solely on a single measurement.

Note:Specific vibration limits and assessment methods shall be determined in consideration of the equipment type, structural configuration, installation conditions, and applicable codes; it is not advisable to directly apply unverified, standardized values.