CONTROL & DESIGN STANDARDS: SURFACE CONTAMINANTS

Surface cleanliness falls into two categories: precision cleanliness and visibly clean. We use precision cleanliness specifications only when defining standards for the internal surfaces of fluid systems. Hydraulic lines, hoses, or tube assemblies are just a few examples of equipment falling under this specification. Otherwise, the visibly clean standard is used. We define visibly clean as the absence of all particulate and non-particulate matter to the unaided eye.

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Cutaway of a hydraulic line, with interior marked as a "Precision Cleanliness Surface."
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