❗ “Never Use NAS Again”? — A Technical Reality Check for Cleanliness Standards in Turbine & Hydraulic Oils 1. What You Saw in the Refinery: A Common but Outdated Practice Many large plants—especially refineries, power plants, and legacy oil & gas facilities—still report NAS values alongside ISO particle counts. This usually means they are using: At … Continue reading ❗ “Never Use NAS Again”?