ISO 12669:2017 PDF

Scope: This document specifies a method of determining the required cleanliness level of a hydraulic system, that is, the most appropriate fluid cleanliness level for an operating hydraulic system based upon the individual requirements of that system. It is applicable to systems where the level of fluid cleanliness is expressed in accordance with ISO 4406, although conversion to other contamination coding systems is possible. It is applicable to both high and low pressure fluid power systems and also lubrication systems. It does not include the effects of soft deformable particles that can be generated by thermal decomposition of the hydraulic fluid.

ISO 12669:2017 Referenced Document

ISO 4406:2017 Hydraulic fluid power — Fluids — Method for coding level of contamination by solid particles
ISO 5598:2008 Fluid power systems and components - Vocabulary
ISO/TR 15640:2011 Hydraulic fluid power contamination control - General principles and guidelines for selection and application of hydraulic filters

2017 ISO 12669:2017 Hydraulic fluid power - Method for determining the required cleanliness level (RCL) of a system