[Opera-CONNIE] vacuum pump status

Fri Jan 16 15:50:38 BRST 2015

yes, we should avoid using a pump with oil.
this could be a bit problem in the long term, specially in a system that has to operate
remotely unattended.

Thanks,
Juan

On Jan 16, 2015, at 11:46 AM, Andrew G Lathrop <lathrop at fnal.gov<mailto:lathrop at fnal.gov>> wrote:

Hi Herman,

Great News!
If the problem with Alexandre's pump has a turbo issue, the roughing pump is a direct
swap. I would not use an oil pump even with a auto-protection vacuum valve, the only
way to be certain oil vapor would not return to the ccd, a LN2 cold trap, which is constant
filling.

Andrew
________________________________
From: Herman P Lima Jr [herman.lima.jr at gmail.com<mailto:herman.lima.jr at gmail.com>]
Sent: Friday, January 16, 2015 11:38 AM
To: Martin Makler
Cc: Juan Estrada; <opera-connie at listas.if.ufrj.br<mailto:opera-connie at listas.if.ufrj.br>>; Andrew G Lathrop
Subject: Re: [Opera-CONNIE] vacuum pump status

Hi all,

I just talked to a mechanical engineer here at CBPF - Alexandre Mello. Actually, he has the same vacuum pump here in his lab, and it is also broken!

If the problem is really the BACKING PUMP, he proposed that we use a mechanical pump available here to replace the one broken. It is not the same pump, but it would do the job.

The replacement is not plug-and-play because of adaptors needed between the pumps. We would need first to buy a longer pipe (that is easy) and also the adapters for both ends.

There is also a restriction concerning the operation of this new pump, since it could send oil back to the system! What would be a disaster of course. There must be a automatic valve between the pumps that would prevent it to happen.

Let's discuss that in more detail next week in a meeting.

Herman

2015-01-16 11:29 GMT-03:00 Martin Makler <martinmakler at gmail.com<mailto:martinmakler at gmail.com>>:
Hi Juan.

That's what I was wondering.
Can you send me some specifications so that I can look for a pump that could do the job?

Cheers.

Martin.

On Jan 16, 2015, at 12:21 PM, Juan Estrada <estrada at fnal.gov<mailto:estrada at fnal.gov>> wrote:

> Is there a pump at CBPF that we could borrow?
>
>> On Jan 16, 2015, at 7:40 AM, Guillermo Fernandez <fmoroni.guillermo at gmail.com<mailto:fmoroni.guillermo at gmail.com>> wrote:
>>
>> Pamela, Alejandro and Stephan, thanks for all the work. It has been a lot.
>> Kevin and Andrew, thanks a lot for all the support from Fermilab. It was very important for the operation.
>> It is the second time we need to face a big problem with the detector, and I think in both cases the response was good.
>>
>> Regards,
>> Guillermo
>>
>>
>>
>>
>>
>>> On Jan 16, 2015, at 9:10 AM, swagner at cbpf.br<mailto:swagner at cbpf.br> wrote:
>>>
>>>
>>> Dear all,
>>>
>>> we checked the vacuum pump again today and followed the suggestions. We unmounted the protection cover over the fan. When we tried to move it manually, there was heavy resistance and it was difficult to turn at some points. We left it in a position where it was more easy to move and switched the pump back on and it was working. Before reassembling everything again we switched the pump on various times for a short amount of time and occasionally it stopped working again. Moving the fan against the resistance again solved the problem temporarily.
>>> At the times when the pump was running there was a strange sound hinting to some internal friction. Probably there is either a problem in the motor or there's something wrong with the diaphragms.
>>>
>>> For the time being we decided with Guillermo to reassemble the pump again and wait for further suggestions from Fermilab. We will leave Angra today. Alejandro and Pamela will come to Angra again next week and try to fix the pump then when new information is available.
>>>
>>> Cheers,
>>>
>>> Stefan, Alejandro and Pamela
>>>
>>>
>>>
>>> Quoting Guillermo Fernandez <fmoroni.guillermo at gmail.com<mailto:fmoroni.guillermo at gmail.com>>:
>>>
>>>> In fact the capacitors look they come with the case and cables from factory:
>>>>
>>>> http://www.electronicon.com/index.php?partno=E33.C78-500805%2F27E151&partnosubmit=Search+%C2%BB&id=423&L=1&search=partno
>>>>
>>>> I found I have a similar capacitor in a water pump I bought two weeks ago (attached). I think it would be a good idea to try to remove the capacitors and take them to Rio to test them. let's take several pictures of the place they are connected and the way the fuse box is organized. I assume none of the cables from the capacitors go directly to the motor. There should be a terminal block inside the box.
>>>>
>>>> Also, Andrew from Fermilab, suggests to try to move the shaft. You can do it from the back of the backing pump. It has a fan, after removing its red cover. The cover is removed unscrewing a few screws. He tried first this at Fermi, these were his words:
>>>>
>>>> "you should feel the vacuum stroke. Easy movement then resistance on the valve closing"
>>>>
>>>>
>>>> Pamela, Alejandro and Stephan:  again, thanks a lot for all the work. In all this craziness of trying to do as many things as possible we may forget to say thanks.
>>>>
>>>> Guillermo
>>>>
>>>>> On Jan 15, 2015, at 4:35 PM, Guillermo Fernandez wrote:
>>>>>
>>>>> Hello,
>>>>>
>>>>> unfortunately, the fuses in the backing pump were not the problem. Alejandro, Pamela and Stephan, after checking that the fuses were ok, tried to start the pump again in 115 and 230V, but the motor didn't start. In both cases the green light of the switch was on. They also measured the current for 115V, it was 2A.
>>>>> They tried to take apart the capacitors, but it was not possible from outside. If we decide to remove them, we need to disconnect the cables from inside the fuse box. They took a couple of pictures of the capacitor model.
>>>>> I told them to assemble the pump again, and leave it on the bench.
>>>>> They will stay until tomorrow in Mambucaba. If no other suggestion, they will return to Rio tomorrow.
>>>>>
>>>>> Guillermo
>>>>
>>>>
>>>> --
>>>> Mensagem Verificada pelo AntiSpam CanIt CBPF
>>>> --
>>>
>>>
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