failures reports for screw flooded compressore 1

[mustafa2014]

Could you please check failure reports for screw flooded comp. for process refrigeration packages and advice please.

The failures always happen to the seal and screws.
IS there any evect if the gas contain BUTANE?

 

[zdas04]

I read through that report in the other thread. I was surprised that there wasn't an oil analysis, a gas analysis, and an oil compatibility report. This looked like a cascade failure to me (i.e., most of the extensive damage noted was likely caused by debris from the first failure being carried throughout the system by the oil). An oil particulate analysis and an oil chemistry analysis would have likely helped pinpoint the location of the initial failure. From the condition of the roller bearings, I would probably assume that was the first failure, but the oil pump was pretty messed up too and it could have been the source.

Hydrocarbon contaminates in the oil is a very common cause of lubrication failures so significant butane can be a real problem (I can't tell you what "significant" means, how much is tolerable is dependent on the oil you started with).

The "dent" marks on the rotor look a lot more like gouge marks to me, but there is only so much you can see in a picture.

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"

 

[dcasto]

without specific knowledge of the lubricant we cant say for sure that butane was a culprit. Synthetic oils are normally specified for refrigeration service to keep from being contaminated. Next, butanes accumulate in the chiller at the coldest spot, not at the hottest spot, think about it. Do they drain butanes and oils from the bottom of the chillers?