Using Coatings to Extend the Life of Oil and Gas Pipeline Valves

In the oil and gas industries, valves are key components involved in the control of the flow of corrosive, abrasive and erosive gases and fluids. However, resistance to wear and galling in valves poses a material problem to oil and gas companies across the globe.

Hard materials are generally used in extreme environments. However, the brittleness of hard materials affects their performance. In addition, such materials can be highly expensive.

Calculation of Pitting Resistance Equivalent Numbers PREN By yaang.com

Pitting resistance equivalent numbers (PREN) are a theoretical way of comparing the pitting corrosion resistance of various types of stainless steel, based on their chemical composition.
The PREN (or PRE) numbers are useful for ranking and comparing the different grades, but cannot be used to predict whether a particular grade will be suitable for a given application, where pitting corrosion may be a hazard.