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Re: Vapor Degreasers



My suggestion is the following:  Go to two or three stage cleaning.  Use an
aqueous cleaner to get the crud off, oils, dirt, etc.  Rinse well with
water.  Air dry or not, depending upon the effect of water on your next
stage.  Then follow with a carefully controlled use of a solvent to remove
the water residue.

For rinse, consider counterflow successive rinses and use of either DI or RO
water.  Counterflow often makes the cost of the higher quality water low
enough to tolerate.  Often the problem with aqueous is the residue left on
parts from hardness and other contaminants in the water.

Ralph

Ralph E. Cooper, Ph.D., J.D.
14139 Woodstream
San Antonio, TX 78231
210-479-5490 (4)
rmcooper@flash.net

-----Original Message-----
From: Meyer, Lacy <LMeyer@hydril.com>
To: 'wjw5@psu.edu' <wjw5@psu.edu>
Cc: 'P2 Tech' <p2tech@great-lakes.net>
Date: Thursday, May 27, 1999 10:04 AM
Subject: RE: Vapor Degreasers


>I have essentially the same problem, however, mine involves Perc. The
theory
>that I used to convince  upper management to change the degreaser
>solution/equipment was REGULATIONS!  I impressed on them how important it
>was to reduce our air emissions because of the reporting requirements.  I
>also told them of the cost that this "new" reporting would incur.  For
>example;  I told them that when our emissions reached 10 tons or more, we
>would have to file Title 5, and in turn that would trigger PSD and
modeling.
>I also told them that it would increase our TNRCC inspections.  When I
>related a cost figure to this reporting, they were eager to see what the
>other options were.  Having regulator on you site doesn't really sit well
>with plant managers.  Also, if you know a little bit about OSHA and some
>industrial hygiene, you can show some insurance savings by protecting the
>workers.  We all know that protecting the worker is an essential part of
our
>job, but I conveyed it as a dollars and cents item to get upper
management's
>attention.  By reducing the exposure to the worker and making the worker
>more comfortable, they will in turn become more productive.
>
>I have also found some great alternatives (all of which have a draw back.)
>Selig Chemical makes an excellent replacement solvent.  It is n-propyl
>Bromide.  This solvent does and excellent job.  However, it is a
>halongenated solvent and the EPA has not taken a stand on it at this time.
>That worries me in that the PEL will be very low, and there could be
several
>draw backs on the regulatory front.
>
>3M makes a hydrofloroether. This chemical meets all the regulatory
>requirements and the EPA has taken a positive stand on it.  It has a
>reasonable PEL, and is worker friendly.  However, the cost is extremely
>high, and it doesn't work near as well as the n-propyl Bromide.
>
>We have also looked into changing equipment.  Aqueous cleaners seem to work
>the best, but they are very expensive.  Also, there is a company out of
>Bloomington, IL that has a spray on application.  It works okay, but it
>doesn't do quite what we need.
>
>Good Luck!
>Lacy A. Meyer
>Environmental Specialist
>Lmeyer@hydril.com
>
>
> -----Original Message-----
> From: wjw5@psu.edu [SMTP:wjw5@psu.edu]
> Sent: Wednesday, May 26, 1999 6:05 PM
> To: p2tech@great-lakes.net
> Subject: Vapor Degreasers
>
> P2-Techers-
>
> Will be visiting a firm who is using a vapor degreaser with TCE as
>the
> solvent. Its a dinasaur that is apparently being misapplied. Its
> refrigeration system is starting to fail as the employees are
>complaining
> of fumes and odors. I need to be a proactive change agent to
>convince them
> that there are better ways to remove lubricants and coolants from
>metal
> parts prior to welding and painting. I'm requesting ammunition to
>use with
> them to convince them to do source reduction and process
>modification
> (aqueous cleaning or ultrasonics or other ideas you might have). I
> understand there are NESHAPS reporting requirements to EPA which I
>suspect
> they are not doing. Can anyone fill me in on those and suggest good
>change
> agent "stuff"?
>
> Thanks in advance.
>
> wjw/
>
> wjw5@psu.edu
>
> Warren J. Weaver
> PENNTAP
> PO Box 5046
> York, PA 17405
>
> Certified ISO 14000 Auditor (#E051734)
>
> fax 717-854-0087
>
> ph 717-848-6669
>
> PENNTAP website:
>            www.penntap.psu.edu
>
>
>