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Roger,

Solvent cleaning in the past usually meant 1,1,1-trichlorethane
or similiar solvent.  Steam cleaning is another acceptable method,
and NOAA has advocated use of hot water and 409 cleaner (copious
amounts of hot water).  

In an aluminum cylinder the hotwater and 409 works very well, but
in a steel cylinder can result in rapid and profound rust formation
(although some have avoided this by using nitrogen to dry the system
and thus slow down or eliminate the rusting with the hot water/cleaner
method.

There is a newer solvent that ANDI is marketing that is supposed to
be safer (EPA wise) than the 1,1,1-trichloro (which I understand is
going to be taken off the market due to ozone layer concerns, along
with another fine solvent cleaner, Freon).

CGA has a booklet on cleaning systems for oxygen use.  You might want to
write and/or call them for their list of publications.

Compressed Gas Association
1235 Jefferson Davis Highway
Arlington, Virginia  

1-703-979-0900

Hope this helps -

John
Submariner Research, Ltd.
(johncrea@de*.co*)

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