[Halld-pid-upgrade] Optical box update Re: DIRC Meeting: Tomorrow December 19 @ 1 pm

[Ernie Ihloff]

Hi Everybody,

First, sorry no one from MIT was on the meeting yesterday. It was mix up 
on our side.

Ernie Ihloff

Answers below.

> Thank you for providing the drawing package for the box and STEP file last week.  Tim had a few questions from the drawings:
> 	1. The 1/4 and 3/4 npt holes on the bottom and top plates are for the water system, correct?
Yes they are for the water system and they are correct
> 	2. The 1/2 npt is for some water level meter?
Yes, it is ultrasonic high level indicator mounted on the top plate.
> 	3. Since there are no features for water on the side plates, I assume the FOB will be completely full with water and will exit through the top fitting in the 3/4 npt hole?
The water return port was increased to 3/4" as requested and is located 
on the back plate.
> 	4. If the box is completely full, no nitrogen purge is needed?
I think we still need to have N2 purge on the box just in case.
> 	5. The weld callout for the 1/8 inch plate to the frame calls for a 25mm fillet (see attached). Is this true?
It is supposed to be a 2 mm weld, every 25 mm. Let me look at the 
drawing and  see if there is a mistake.
> 	6. What is the fillet weld size on the inside of frame (opposite the seam weld)?
We are going to review this one more time before we supply an answer.

Thanks, Ernie

-- 
Ernie Ihloff P.E.
Principal Research Engineer
Engineering Group Leader
MIT Bates Research and Engineering Lab
Office 617-253-9503
Cell 781-760-9381
eihloff at mit.edu

On 12/19/2017 1:51 PM, Justin Stevens wrote:
> Hi Jason, Ernie, and Jim,
>
> As you were unable to attend today’s meeting, please send an update to the mailing list on the status of the optical box.  A few other questions that came up today are below:
>
> When should we expect to have a prototype of the “red bracket” to test the PMT mounting?  This will help in coordinating travel and when we’ll need to loan you a PMT/electronics board module from JLab for these tests.
>
> Thank you for providing the drawing package for the box and STEP file last week.  Tim had a few questions from the drawings:
> 	1. The 1/4 and 3/4 npt holes on the bottom and top plates are for the water system, correct?
> 	2. The 1/2 npt is for some water level meter?
> 	3. Since there are no features for water on the side plates, I assume the FOB will be completely full with water and will exit through the top fitting in the 3/4 npt hole?
> 	4. If the box is completely full, no nitrogen purge is needed?
> 	5. The weld callout for the 1/8 inch plate to the frame calls for a 25mm fillet (see attached). Is this true?
> 	6. What is the fillet weld size on the inside of frame (opposite the seam weld)?
>
> Finally, we need to discuss the assembly/installation sequence of the optical box at a future meeting.  Could you make a presentation on this at the next DIRC meeting on January 9th?
>
> Happy Holidays,
> Justin
>
>> On Dec 18, 2017, at 3:03 PM, Justin Stevens <jrsteven at jlab.org> wrote:
>>
>> Hi All,
>>
>> We’ll have a DIRC meeting at 1 pm tomorrow.  The agenda can be found at https://halldweb.jlab.org/wiki/index.php/December_19,_2017_DIRC, please add items as necessary.
>>
>> -Justin
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