I concur with the majority. A correct vapour phase procedure with
stabilised trichloroethylene would be my choice. However, a massive
device such as this will take time and must not be short-cut. Process:
1. Immerse in boiling TCE until the part is homogeneously at boiling
point, open side down.
2. Transfer to cold TCE, with or without ultrasound, until the TCE and
the part are at the same temp.
3. Transfer to the vapour zone and keep it there until 1 full minute
after there is no more physical sign of condensation (i.e., the part is
homogeneously at boiling point again)
4. Transfer to refrigerated freeboard and keep there for several minutes
to allow any vapour to drain off, back into the machine and to allow the
thing to cool down somewhat.

I would expect the total cycle to take at least 30-45 minutes, because
of the thermal mass.

Brian

Phil Nutting wrote:
> We have a large aluminum casting
> Good afternoon,
>
>
>
> We have a large aluminum casting (35 inches long by 10 inches wide by 10
> inches high and weighs about 75 pounds) that forms the outer enclosure
> of a finished product.  After full assembly this unit it filled with
> dielectric oil.  For units which require repair after failure, we want
> to clean out the old oil and any residue from the failure or from
> machine shop rework.  We would like a system that does not drain into
> the local sewer or waste water system.  Where this unit is used at 180kV
> we need to get all the conductive schmoutz out.  What are recommended
> cleaning methods?  Is there a MIL or NASA spec for cleaning large parts
> like this?
>
>
>
> I know that a final wash with DI water is probably the best, but what
> would cut the oil best and what method of application?
>
>
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>
> Phil Nutting
>
>
>
>

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