Now that you have established that relationship
by developing the strength factor, you can titrate any
future citric acid solution of unknown concentration by
repeating the sampling and titration procedure. You will
need to sample the same quantity as you did to estab-
lish this procedure for the strength factor to be accurate.
Since citric acid is a relatively weak acid, it would not be
expected to be harmful to the materials of construction of
most standard wastewater treatment systems.
How to Select the Right
Washer Line Material
Q. My company plans to install a
six-stage washer that includes an
alkaline cleaning tank that will
operate at about 130°F and an
acid deoxidizing stage that will
operate at about 90°F. Would
you recommend polypropylene
or 316 stainless steel for the tank
material?
A. The choice of washer material
will be based primarily on the
durability requirements you will
need along with the intended
service life of this cleaning
system. An open, non-pressur-
ized tank is compatible with the
temperature range you want it to
work in. I would expect the poly-
propylene to be good up to about
160°F. It is also compatible with
almost all standard chemicals
used in metal finishing except for
chromic acid. The 316 stainless
steel would be equal in compat-
ibility with these chemicals, but
would be much more expensive.
The 316 stainless steel grade
would be the preferred stain-
less steel, having more corrosion
resistance than the 304 grade.
Depending on the size and
weight of your parts, the stain-
less steel construction would be
much more durable. I have seen
plastic industrial piping hold
up well to the temperature and
chemistry of most metal finishing
solutions and operations, but
then get destroyed by accidents
and maintenance activities.
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Innovation S1
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PARTS CLEANING
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