Vibration Measurement and Evaluation of Reciprocating Compressors According to GB7777-87
Reciprocating compressors are used in many industries such as automotive, mining, and chemical engineering. They are versatile and reliable pieces of machinery, but they need to be monitored on a regular basis to ensure they are in good working order. In some industries, vibration measurement and evaluation is a requirement to operate safely and efficiently. GB7777-87 is the standard for evaluating vibration in reciprocating compressors.
The purpose of GB7777-87 is to provide a method of acoustically and vibratory measuring the performance of reciprocating compressors. It also serves as a means of detecting and evaluating any changes that have occurred in the machine. This is a significant step towards helping operations maintain their machines within an acceptable level of vibration.
The evaluation includes analyzing the vibration signatures at critical points of the compressor, such as the base, top, and side. The position and the type of measurement is determined by the manufacturer or the operating supervisor. It also involves the use of vibration transducers, which measure the vibration of the compressor in terms of displacement, velocity, and acceleration.
The vibration characteristics are then evaluated using the following parameters:
• Maximum and minimum vibration levels.
• Frequency range.
• Amplitudes of various spectral bands.
• Running speed of the compressor.
• Exposure time of the operator and machine parts at various levels of vibration.
• Variations of the vibration level over time.
• Variations of the orientation at which the vibration is measured.
• Non-uniformity of the vibration.
• Correlation of the vibration levels with acoustic sound.
• Further measurements may be required to assess the function of specific components and their contribution to the overall vibration level.
The assessment of the vibration level should be conducted in compliance with GB7777-87. The data collected should be stored and carefully analyzed to detect any trends. Compressor heads and other components should be separately checked to assess their performance. All components should be inspected to determine their current condition and verify that their tolerances are within the operating range specified by the manufacturer.
If the vibration levels exceed the maximum specified by the manufacturer, the machine should be placed out of service and corrective action should be taken. Depending on the severity of the issue, corrective measures may include inspecting and replacing any defective parts or components and readjusting the compressor’s speed or other operating parameters.
In conclusion, vibration measurement and evaluation of reciprocating compressors should be done in accordance with GB7777-87. This is necessary to ensure optimal performance, reliability and safety. Standardized procedures should be established and continuously monitored to identify any potential problems and evaluate the machine’s overall health.
