Internal corrosion bench marks

[bigghassan]

I’ve got different references related to internal corrosion of pipeline which confused me, is anybody would help me to find proper internal corrosion bench marks including the following:
Co2 corrosive partial pressure and concentration
H2S corrosive partial pressure and concentration
Chloride corrosive concentration
Iron / magnesium ratio cause corrosion for carbon steel
Dissolved oxygen corrosive concentration
Fluid velocity

A. Maceddey

 

[strider6]

The assessment of Corrosion on Pipeline due to CO2, H2S... is not easy.
There are models, like Dewaard-Miliam, that allow you to assess the corrosion due to CO2 and other modified version of the model that take into account also the effect of H2S.
Material Selection in fluid with H2S shall be based also on ISO 15156/ MR 0175.

http://www.bssa.org.uk/topics.php?article=98

http://www.capp.ca/default.asp?V_DOC_ID=763&PubID=109839

There are also some Software that perform a material analysis and material selection like the norsok model or the ECE (electronic corrosion engineer).

http://www.standard.no/imaker.exe?id=10405

http://www.standard.no/imaker.exe?id=1362

http://www.intetech.com/index.php?option=com_content&task=view&id=106&Itemid=163

Selection guidelines for corrosion resistant alloys in the oil and gas

http://www.stainless-steel-world.net/pdf/10073.pdf

Corrosion Prevention Oil & Gas

hope this help

S.

Corrosion Prevention & Corrosion Control

 

[cacofes]

Here is a list of rules of thumb that could apply for your case.
CO2 - Partial pressure (psi) - Below 7, non corrosive
Fe/Mn - Iron to Manganese ratio > 100:1 indicates active corrosion. This applies only to sweet systems
CO2/H2S - Check Nace paper 02288 by Marsh, Palmer and Newman
Chlorides - Low or high are bad depending on acid gas compositions. You could have very low pH on low chloride waters or high conductivity in high chloride brines
Oxygen - I have seen some rules of thumb talking in terms of ppb instead of ppm. In any case, you do not want oxygen in the system. The most common one we use states that over 0.3 ppm of oxygen you will have severe corrosion
Fluid velocity - I would rather talk in terms of flow regime. For pipelines the best would be wave flow. Enough velocity to carry solids and maintain a short transit time in the system.

Hoping this helps,

JP