Being an Allman Brother's fan, I never get tired of hearing Freeboard.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
Sent: Monday, August 21, 2006 12:40 PM
To: [log in to unmask]
Subject: Re: [TN] Vapor Degreaser...
All of the new solvents will require increased freeboard. The retrofit on
our unit cost $25,000. But, we went from 55 gallons per month to 5 gallons
per month. At the time, the expensive chemistry (snake oil) we were using
cost $200 per gallon. The retrofit paid for itself very quickly. All of
these materials, Ensolv, Vertrel, Novec, AK-225, have gone up in price to
the point where one has to doubt they make sense for defluxing circuit card
assemblies. While they do have advantages in some applications. It certainly
isn't a process I would initiate on a whim.
Our system took 40 gallons to fill. Another caution, these materials absorb
water and you will have a super chiller in the free board area. The chiller
coils will condense water from the air and drip into the fluid tank(s). If
you vapor clean with the azeotrope version, you will need to include a
desiccator in the retrofit, as the water will mess up your snake oil.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Steve Gregory
Sent: Monday, August 21, 2006 1:33 PM
To: [log in to unmask]
Subject: Re: [TN] Vapor Degreaser...
Hi Brian!
I read everything at the link you provided, and I am giving it thought. Our
degreaser doesn't have an extended freeboard, so that would need to be added
if we were to go to Ensolv.
Let me ask you this, what would you use in a vapor degreaser? I did a search
on vapor degreasing chemicals and almost everything that I came up with were
nPB based...what else can I use?
-Steve Gregory-
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Monday, August 21, 2006 10:17 AM
To: [log in to unmask]
Subject: Re: [TN] Vapor Degreaser...
I do not recommend EnSolv, as it contains nPB. You can learn a little about
its environmental and H&S issues - and both require serious thought - at
http://www.cypenv.org/worldenv/files/npb.htm.
If you must use it in a vapour degreaser, the recommended practices to
reduce emissions include a deep (1½ times the opening diagonal) refrigerated
freeboard, automatic sliding doors, small baskets to prevent pistoning the
vapour out of the machine, draught-free environment, automatic hoist to
respect freeboard dwell times and prevent brusque movements, minimal
disturbance when filling/emptying machine and only when cold etc. I would
also recommend operators wear badges so that their exposure can be
constantly monitored. Listen to the operators for any unusual symptoms. The
operators should wear protective clothing, bearing in mind that dermal
uptake of nPB can be significant.
UNEP discourages the use of nPB wherever possible.
Brian
Steve Gregory wrote:
> Good Mornining All!
>
> Just curious, are there any of you out there still using a vapor
> degreaser? If so, what are you using in it?
>
> We have a Baron Blakeslee MLR-120 that looks in pretty good shape and
> we're thinking about using it for certain cleaning applications. I've
> been looking at some Enviro Tech Ensolv-Ionic solvent to use in it.
>
> There's been some suggestions to use alcohol in it, but I don't think
> that's a very good idea considering the flammability of alcohol. But
> besides that, alcohol isn't a very good solvent anyway.
>
> Just wondering if anybody is still vapor degreasing anymore...
>
> Thanks!
>
> -Steve Gregory-
>
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