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

[Justin Stevens]

Hi Ernie, Jason, and Jim,

Thanks for the feedback on the questions to the drawings.  There were 2 other questions that came up that meeting:

> 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.


> 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?



Could you please respond to these as well?

-Justin

> On Dec 20, 2017, at 2:01 PM, Ernie Ihloff <eihloff at mit.edu> wrote:
> 
> 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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>