[Dsg-rich] [EXTERNAL] Re: Atlas Copco technician visit summary - compressor element suffered catastrophic failure

[Marco Mirazita]

Hi Tyler,
thank you for this report. Just one clarification, the test you mention 
Dario and Sandro did on 10/30 was done after request by Bob Miller who 
wanted to verify the malfunctioning of the compressor.
Best regards,
Marco


Il 2019-11-11 14:09 Tyler Lemon ha scritto:
> Hello,
> 
> The Atlas Copco technician was at JLab today. He, Calvin, and I went
> and checked out RICH compressor 1. Attached are some photos from the
> visit.
> 
> First we opened the compressor cabinet and ran the compressor so he
> could get an idea of how it was acting while visually inspecting the
> moving elements (photo "1 compressor elements.jpg"). As soon as it was
> running, we noted the compressor sounded like it was running much
> rougher than before.
> 
> From the front panel of the compressor, the technician read the two
> compressor elements' outlet temperatures (photo "2 compressor element
> outlet temps when running.jpg"). The low temperature of element 2
> indicated that it was not operating correctly and was not compressing
> air.
> 
> Next we started to remove element 2 from the cabinet to be able to
> fully open the element and look at the scroll. When the piping was
> removed, we saw a lot of metal dust and chunks (photos "3 compressor
> scroll 2 debris - from removing filter.jpg" and "4 compressor scroll 2
> debris - at filter inlet.jpg").
> 
> When the element was removed from the cabinet, relocated via overhead
> crane to a workbench on the ground level, and opened, it was evident
> that element 2 suffered a catastrophic failure (photo "5 compressor
> scroll 2 catastrophic failure.jpg"). The tech stated that this
> catastrophic failure could be due to the compressor running 2 x the
> 5000-hour recommended maintenance period without proper maintenance.
> 
> Based on the logbook entries for the tests performed recently, the
> failure most likely occurred during the test mentioned by Sandro and
> Dario in the logbook entry at https://logbooks.jlab.org/entry/3738070
> [1].
> 
> From these findings, element 2 of the compressor must be replaced. The
> technician strongly recommends also replacing the other compressor
> element (element 1) as it has run for just as long. He also stated
> that depending on the price, it may be more cost effective to buy a
> brand new replacement compressor. He will generate a quote for both
> the new compressor elements and a brand new compressor to help us make
> an informed decision.
> 
> Since compressor 2 (one that works now) will be used in the upcoming
> physics run (Nov 2019 - May 2020; ~5 months = ~4000 hours), it may
> require maintenance right now to be able to run for the full
> experiment. We will check compressor 2's counters to see how many
> hours it has and when it would need maintenance.
> 
> Best regards,
> Tyler
> 
> 
> 
> Links:
> ------
> [1] https://logbooks.jlab.org/entry/3738070
> 
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