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Active Contributor

Join Date: Jul 2009
Posts: 13

Corrosion Inhibitor Residual

08/18/2010 4:38 AM

Greetings gent,

I have question regarding the corrosion inhibitor residual quantity.

If I inject a corrosion inhibitor at the beginning of a long distance piping and I have taken a sample from different locations to get the corrosion inhibitor residual. The resulted was as follows:

5 ppm is injected

Sample point (1)

10 m from the injection system

Sample point (2)

5m from point (1)

Sample point (3)

5m from point (2)

Corrosion residual

4.5 ppm 3.2ppm 4.00ppm

As you can see from the table the corrosion residual is decreased at point 1 and also decrease at point 2 but it is increase at point 3, what do you think the reason of this changing?

why the corrosion residual is increased at point 3?

when we can say that the pipe is not protected?

is there any

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: corrosion inhibitor residual

08/18/2010 5:07 AM

5ppm is one significant digit.

4.5 and 3.2ppm are two significant digits

4.00ppm is three significant digits.

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Power-User

Join Date: May 2007
Posts: 225
Good Answers: 4
#2

Re: Corrosion Inhibitor Residual

08/19/2010 6:32 AM

in order to understand what happens to the inhibitor it should be necessary to have a look at the piping layout, and also the type of fluid inside the pipe.

Regarding the second question, the efficiency of the corrosion inhibitor is not just a question of how much inhibitor is injected, but also is related to the type, flow conditions inside the pipe.. If you want to understand if corrosion is under control you should install a corrosion probe for online monitoring of perform some kind of NDT (UT thickness for example)..

S

corrosion prevention

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