Cip

Surface Finish and Clean-in-Place Requirements Sanitary fittings for food processing need smooth bore surfaces so that clean-in-place systems can flush them effectively. The surface finish spec is typically Ra 0.8um or better. I have worked with food processing plants that require Ra 0.4um on their most critical fittings. At that level, every step of the drilling process must be controlled precisely. The reason for the surface finish requirement is bacterial harboring. A rough bore surface with peaks and valleys provides microscopic spaces where bacteria can survive the CIP cleaning cycle. The smooth surface allows the cleaning solution to flow across the entire bore area without leaving any protected zones. I have had quality engineers explain to me that a single fitting with a rough bore can compromise the sanitation of an entire processing line. ...