Specifications for allowable vibration levels of reciprocating compressor motors~
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There is a small 30kW reciprocating compressor on site; the motor runs with quite high power, yet the unit itself remains very stable. The owner considered it too dangerous; the axis vibration level of the motor was measured to be around 14 mm/s. By comparing it with ISO2372 standards, it was determined that this device falls into Category II, which means that the vibration level is well above the acceptable limits. Later, we took a closer look and found that reciprocating compressors should be classified as Category V or VI equipment; the corresponding standard is GB/T 7777-2003, with an allowable value of around 28 mm/s. So I would like to ask the senior colleagues whether the vibration standards for reciprocating compressors are not covered by ISO2372? ? Thank you!
The maximum motor vibration value shall not exceed 2.8 mm/s. The maximum value for rigid installation is 1.8 mm/s. This motor far exceeds this limit.
What is the speed? It’s also hard to make a judgment when it’s too low.
Regarding the issue of standard applicability, your statements contain the following errors: 1. ISO 2372 is obsolete and has been replaced by ISO 10816； 2. I checked GB/T 7777-2003, and it indeed contains the mention of 28 mm/s that you mentioned. But it should be noted that the reference point for this standard is the compressor body, not the motor. And since your current suspect is the motor, it is inappropriate to use the evaluation criteria of this standard.
For what kind of compressors and operating conditions, use the specifications to find out
Class I I: Medium-sized machines without a dedicated base (with motors having an output power of 15–75 kW), as well as engines or machines mounted rigidly on a dedicated base (with a power of 300 kW or less). Category N: Large prime movers and other large machines with rotating mass mounted on foundations, whose foundations are relatively flexible in the direction of vibration measurement. Reciprocating compressors themselves belong to large-scale equipment and are not classified as Category II devices ； Classification error ； The vibration amplitude of 28μm you mentioned is definitely not up to standard ； Anything over 11.2μm is considered unqualified ； That of yours is a serious failure: