[dsg-eic_dirc] [EXTERNAL] Re: EIC-DIRC as built survey of foam padding.

[Shepherd, Matthew]

Two-fold:

(1)  It provides continued functionality of the air-spring in the case that pressure is lost on a line in transit.  We had remote pressure monitoring.  We were a bit concerned about blowing off a line or having a major leak just due to the sheer number of connections, but I know these connectors are robust.

(2) During loading and unloading it is useful to have to have functional air-spring system to protect against shock while moving the crate with the forklift, in the truck, etc.  The check valves allow you to "charge" the air springs, then disconnect from supply, which remained in the truck in our case.  One also doesn't want supply lines dangling from the crate while trying to load and unload.

So, you can argue maybe you are going to just trust the connections and (1) is not a concern.  However, item (2) really affects the functionality of the suspension during loading and unloading when the crate is disconnected from the regulated air supply.

There is one thing to be cautious about:

The check valves will make it difficult to bleed pressure in the case that the springs are over-charged, e.g., due to improper setting of the regulator.  One needs to be sure the supply is properly regulated before connecting to the air spring system with the check valves.

Matt


> On Nov 8, 2023, at 3:36 PM, George Jacobs <jacobsg at jlab.org> wrote:
> 
> I have a question about the gas system. What is the purpose or function of the individual check valves used on each air spring?
> 
> George
> 
> -- 
> George Jacobs
> Jefferson Lab (TJNAF)
> STE 12
> 12000 Jefferson Ave.
> Newport News, VA 23606
> (office) 757-269-7021
> (email) jacobsg at jlab.org
> (url) https://userweb.jlab.org/~jacobsg
> 
> 
> From: Shepherd, Matthew
> Sent: Monday, November 6, 2023 11:11 AM
> To: Tyler Lemon
> Cc: Grzegorz Kalicy; George Jacobs; dsg-eic_dirc at jlab.org
> Subject: [EXTERNAL] Re: EIC-DIRC as built survey of foam padding.
> 
> 
> Tyler,
> 
> I just sent you a Google drive link to a place that Greg was collecting this documentation.  We uploaded a bunch of stuff there about a year ago.
> 
> You can see:
> 
> GAS SYSTEMS.pdf
> 
> This should be a rough schematic of the air spring suspension system.  I don't think you need the "nitrogen purge system", so just the first page of that is relevant.
> 
> There are some other photos.  I can ask John if he has a mechanical drawing of the little brackets that attach the dampers.
> 
> Matt
> 
> 
> > On Nov 6, 2023, at 10:57 AM, Tyler Lemon <tlemon at jlab.org> wrote:
> > 
> > Hi Matt,
> > 
> > Do you also have any drawings or documentation on what was done for the old crates that you are sending photos for?  
> > 
> > Anything we don't have to make from scratch, including drawings/diagrams/etc., only saves time in the long run.
> > 
> > -Tyler
> > 
> > 
> > From: Shepherd, Matthew
> > Sent: Monday, November 6, 2023 10:55 AM
> > To: Grzegorz Kalicy
> > Cc: Tyler Lemon; George Jacobs; dsg-eic_dirc at jlab.org
> > Subject: [EXTERNAL] Re: EIC-DIRC as built survey of foam padding.
> > 
> > 
> > Hi Greg,
> > 
> > I got these photos and the drawing of the lower support bar from John.   You may need to check the dimensions of the support bar and verify that it matches your inner crate.  
> > 
> > In particular you need to be sure the mounting holes are going to land on something solid under the inner crate. 
> > 
> > Matt


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