Carbon Steel vs CL 1

[Triettze]

Hello! We are specifying pipes for a water injection system (high pressure - Rating 1500) with a physiochemical analysis of 36400 ppm chloride (CL). We need to use Carbon Steel pipe and to limit the corrosion,we use a corrosion allowance of 0.125 in, however, we think that this ppm of chloride are excesive. How we can calculate the corrosion allowance for this kind of fluid? Is it neccesary include some internal coating material or change the carbon steel to Alloy Steel?

 

[SJones]

Chloride is not the corrosion issue for carbon steel. For seawater injection (assumed from chloride concentration), the two biggest issues will be: oxygen corrosion and MIC. The latter can't really be controlled by corrosion allowance. A prediction of oxygen corrosion rate can be found in I Andijani & S Turgoose, Prediction Of Oxygen Induced Corrosion In Industrial Waters, Water Science & Technology, Vol 49, (2), 2004, pp 115 - 120.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

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