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Thank you DLiteE30 for your post. The vibration is in radial direction, 6-8% of speed. It's a new plant and at this time the equipment is not running, so I don't have the % of run-time in this condition. I think that, as you said, the best thing to do is watch it and see what will happen.

Hello everyone, Recently I've experienced some problems with a centrifugal compressor presenting subsynchonous vibration due to aerodynamically induced forces, most probably diffuser rotating stall. The vibration starts at low flows, but within the operational range. Amplitude is not reaching...

As mentioned by turb1, a PTC type 1 or a full power-full pressure test is very expensive. I've seen OEM that don't even have capacity in their test bench to do these kind of tests depending on the equipment, due to limitations on power, heat exchangers...sometimes hydrocarbon is not permitted...

Are you thinking about purchasing a non-API compressor? I think api is basic and you wouldn't gain much by not using it.. Just my opinion.

Hello guys, I have some questions about the damped unbalanced response analysis that api requires for centrifugal compressors. The rotor of this compressor has 7 impellers between the bearings (no overhung impellers). Api says that, for conical modes an unbalance shall be added at the location...

I think that going beyond 1000 CFM with recips is not usual because the cylinders are going to be huge and that is not economically viable. And recips are not so easy to balance like a centrifugal compressor, and I think this has a big impact on the max speed/flow they can achieve.