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47001
How to remove the chlorine ions on
stainless steels surface
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Our company makes petrochemical process equipment in Korea.
Now, we have several pieces of stainless steel equipment like 304,
304L & 316L.
Our client requests us to use de-mineralized water that the chlorine
content is under 2 ppm during a pressure test to prevent any
corrosion due to chlorine ions.
However, we don't have any facility to make the de-mineralized water;
and, the water volume is very big.
Is there any way to remove the chlorine ions on the stainless steel
face after the pressure test with general water?
S.M. Jung
- Changwon, Kyeongnam, Korea
+++++++
I think you are asking the wrong question, S.M. The right question
would be something like "how can I economically provide the required
water of 2 ppm chlorine?" :-)
I don't know whether the chlorine exposure can cause permanent
damage to the stainless steel, but I don't think we can rule that
out.
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Ted Mooney, P.E.
finishing.com
Brick, New Jersey
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First of two simultaneous responses -- +++++++
I would look into getting a reasonable sized reverse osmosis unit.
A good pre filter, then a granulated carbon filter followed by a
lower micron filter than your first filter will remove a large amount
of chlorine, but NOT chloride. Recycle your water thru the RO unit
into a storage tank that is plastic.
James Watts
- Navarre, Florida
Second of two simultaneous responses -- +++++++
Usually 2 ppm of chlorine does not cause enough of a problem to
worry about. If it is chlorIDE, it is more of a problem.
Ted is correct, in that it is not too hard to make water that is less
than 2ppm of chlorine. What quantity are you talking about? There are
not too many chlorides that are insoluble in that low a
concentration, so you probably need to go to a RO or DI process. You
could rent a DI system probably.


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