How can I convert corrosion rate between mils per year and mm/y?
Acorrosion rate conversionis a technique to change the measurement units of a givencorrosion rateto another unit for comparison purposes or a specific engineering application. When converting a corrosion rate between these units you must keep in mind that a mil is a thousandth of an inch (i.e., a thousand mils equals one inch) and that one inch equals 25.4 millimeters:
1000 mils = 1 inch = 25.4 mm
Hence, one millimeter equals 39.37 mils:
1 mm = 1000 mils/25.4 mm = 39.37 mils
So, to convert a given corrosion rate from mm/y to mils/y, you must multiply by 39.37
and, to convert a given corrosion rate from mils/y to mm/y, you must divide by 39.37
Note: mils per year (mm/y) is often known as themils penetration per yearand abbreviated as mpy.
Conversion examples:
- A corrosion rate of 0.10 mm/y is equals to what in mpy?
0.10 mm/y * 39.37 mils/mm = 3.94 mpy
- What is the equivalent of 5 mpy in mm/y?
5 mils/y / 39.37 mils/mm = 0.13 mm/y
Having the corrosion rate expressed in the appropriate unit of measurement is important because unit consistency facilitates calculating the remainingservice lifeof an asset. For example, if your equipment wall thickness is measured in inches and your corrosion rate in mm/y, and you want know how long it will take corrosion to consume a certain amount of wall thickness (thewall loss), then you will need to first convert the corrosion rate to mpy, and then to inch/y, before making the calculation. (To learn more about conversions, read相关系数osion Rate Conversion: Simple Ways to Convert Data Between Common Corrosion Units.)
Tags
Written byOsvaldo Mejia| Sr. Pipeline Integrity Engineer at Petroleum Development Oman
![Profile Picture of Osvaldo Mejia](http://m.crimeawalks.com/images/uploads/headshot_osvaldo-mejia_3_453px.jpg?width=400&height=400&mode=crop&format=jpg&quality=70&scale=both)
Osvaldo Mejia currently serves as a Sr. Pipeline Integrity Engineer at Petroleum Development Oman (PDO) LLC. He has over 15 years of experience designing and implementing corrosion control programs, risk based inspection and maintenance strategies, and conducting fitness for service evaluations and integrity assessments of assets for the oil & gas, process and petrochemical industries.
He is the author and lecturer of various training courses related to corrosion control, risk management and integrity management. He has authored and lectured various technical papers at national and international conferences and technical seminars. He is an approved NACE instructor for the Pipeline Corrosion Integrity Management (PCIM), In-Line Inspection (ILI), Direct Assessment (DA), Cathodic Protection Tester (CP1) and Cathodic Protection Technician (CP2) courses.
More Q&As from our experts
Related Terms
- 相关系数osion Rate
- Mils Penetration Per Year
- 相关系数osion Rate Conversion
- 相关系数osion Penetration Rate
- Wall Loss
- Weight Loss Analysis
- 相关系数osion
- Electrochemical Reaction
- Deterioration
- 相关系数osion Resistance
Related Articles
Don't miss the latest corrosion content from Corrosionpedia!
Subscribe to our newsletter to get expert advice and top insights on corrosion science, mitigation and prevention. We create world-leading educational content about corrosion and how to preserve the integrity of the world’s infrastructure and assets.
- Tank Bottom Corrosion on the Soil Facing Side - Solved
- Understand and Harness Corrosion-related Regs and Acts on Infrastructure
- Over-Voltage Protection
- Using Flange Isolation Kits and Monolithic Isolation Joints
- How to Properly Spec a Monolithic Isolation Joint
- Improving Pipeline Emissions: The Role of Flange Isolation Kits
- Epoxy Coatings 101: What Kind to Use and When