This International Standard specifies the procedures for flushing from the hydraulic lines of larger hydraulic fluid
power systems solid particulate contamination that can be introduced during the initial build of a new hydraulic
system or after maintenance or modification of an existing system.
This International Standard supplements, but does not replace, the requirements of the component supplier and
customer, especially when those requirements are stricter than those specified by this International Standard.
This International Standard is not applicable to
a) the chemical cleaning and pickling of hydraulic tubes, or
b) the cleaning of major system components (see ISO/TR 10949).
Verification of the cleanliness of assembled systems is covered in ISO/TS 16431.
ISO 23309:2007 Referenced Document
ISO 4021 Hydraulic fluid power; particulate contamination analysis; extraction of fluid samples from lines of an operating system
ISO 5598 Fluid power systems and components — Vocabulary*, 2020-01-06 Update
ISO/TR 10949:2002 Hydraulic fluid power - Component cleanliness - Guidelines for achieving and controlling cleanliness of components from manufacture to installation
ISO/TS 16431 Hydraulic fluid power - Assembled systems - Verification of cleanliness
ISO 23309:2007 history
2020ISO 23309:2020 Hydraulic fluid power systems — Assembled systems — Methods of cleaning lines by flushing
2007ISO 23309:2007 Hydraulic fluid power systems - Assembled systems - Methods of cleaning lines by flushing