How to use NORSOK M-506 Edition 3: 2017 for CO2 corrosion rate calculations? Norsok M506 is a recommended practice for calculation of corrosion rates in hydrocarbon production and process systems where the corrosive agent is CO2, the model is used in oil and gas industry. The model is fitted to much of the same lab data as the model developed by De Waard-Milliams with additional experimental data at 100 to 150 °C. The model has been issued as a standard for the Norwegian oil industry and is openly available through the Norsok standards website. You have to download Norsok M506 excel file to do any corrosion calculations. To use Norsok M-506 Edition 3 :2017 you will have to purchase a copy of the standard Norsok M506 and download the pdf document Norsok M-506 Edition 3 :2017. The cost is NOK 712.00 (approximately USD $110.00). The purchase can be done  via the Standard Norge website. The pdf document will allow you to download the NORSOK M-506 Edition 3: 2017 model as an excel macro file “NORSOK_M-506r3.xlsm”. The link to download the file NORSOK_M-506r3.xlsm is found in chapter 4 of the pdf file Norsok M-506 Edition 3 :2017. Norsok M506 Rev 3 is an excel macro file that you have to download through the Norwegian Standard website. Once you download NORSOK_M-506r3.xlsm you open it via microsoft excel. You can use Norsok M506 to calculate corrosion rates, you will require the following input:

• Pressure
• Temperature
• CO2
• Ionic Strength
• Shear Stress

Limitations of Norsok M-506 Edition 3 :2017 and the file “NORSOK_M-506r3.xlsm” are the following:

• Shear stress: the shear stress is a sensitive variable that needs accurate information in order to have valid results. The shear stress must be know (or calculated)
• Ionic strenght: The Norsok M506 model is very sentitive to ionic strenght. The model required pH to be calculated based on the ionic strenght.
• Only carbon steel calculations: the model Norsok M506 is limited to carbon steel
• No H2S analysis: Norsok M506 does not consider H2S in the calculations. The model is not suitable for sour service and does not contain information regarding NACE MR0175 materials and compliance.

Norsok M-506 Edition 3 :2017 and the file “NORSOK_M-506r3.xlsm” is a useful tool however requires precise input and is limited with regards to sour service. If you require a simple corrosion rate tool with accurate sour service data handling you have to use alloyselect.com alloyselect.com is an online software for materials selection of oil and gas assets that allows the user to carry out a corrosion assessment considering not only corrosion rates by CO2 but also evaluate the risk of sulfide stress corrosion due to H2S. alloyselect.com also allows you to select corrosion resistant alloys for sour service and verify material test reports (MTRs)

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With a wealth of experience in the oil and gas industry, we provide independent materials and corrosion consultancy to help companies reduce risk, save money and apply best practice in their oil and gas businesses.