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16/30273511 DC BS ISO 23309. Hydraulic fluid power systems. Assembled systems. Methods of cleaning lines by flushing, 2016
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Principle of flushing
- 5 Flushing lines in a hydraulic system
- 5.1 Inital factors to consider
- 5.2 System layout
- 5.2.1 Designers of hydraulic systems shall plan for system flushing in the design phase. Dead ends without circulation shall be avoided. If there is a risk of particulate contamination moving from the dead end to the rest of the system, then the dead end
- 5.2.2 Circuits should preferably be connected in series as the Re can be defined. However parallel connection of line sections is acceptable provided that turbulent flow can be achieved and maintained.
- 5.2.3 Components that can prevent a high flow velocity being achieved or that can themselves be damaged by high velocities of particulate contamination shall be disconnected from the circuit or bypassed. It shall be possible to interconnect each of the ci
- 5.2.4 Sampling valves in accordance with ISO 4021 shall be provided at strategic locations.
- 5.2.5 The rating of any built-in filter elements shall be equal or finer than the flushing filter and any built-in filter shall be replaced if required. The original filters can be reinstated after flushing.
- 5.2.6 Connectors and conductors shall be of uniform inside diameter to avoid trapping any particles for possible release later. They shall also be suitably sized to avoid large pressure losses.
- 5.3 Component cleanliness level
- 5.4 Anti-corrosion agents
- 6 Treatment of lines
- 6.1 Preparation of lines during fabrication
- 6.2 Surface treatment
- 6.3 Storing of lines and connectors
- 7 Installation of piping systems
- 7.1 During installation of piping systems, welding, soldering or heating the lines shall be avoided to prevent scaling. If this is not possible, the relevant lines shall be cleaned and re-protected (see ISO/TR 10949).
- 7.2 Flanges or recognized connectors shall be used. All protection items fitted to lines and components (e.g., caps) shall be removed as late as possible in the installation process (see ISO/TR 10949).
- 8 Flushing requirements
- 8.1 General
- 8.2 Removing particles from internal surfaces
- 8.2.1 The main requirement for effectively removing particulate contamination from hydraulic lines is that the flushing fluid has turbulent flow. Turbulent fluid flow also ensures transportation of the particulate contaminants out of the system and to the
- 8.2.2 Re and the required flow rate (qV), can be calculated using Equations (1) and (2):
- 8.2.3 The use of vibration, high frequency sound, or a change in flow direction can contribute to a faster removal of particles. However, this is a supplement and not an alternative to turbulent flow.
- 8.2.4 The pressure in the piping system shall be monitored to ensure that it does not exceed the system’s maximum allowable working pressure.
- 8.3 Filters and separation of particles
- 8.3.1 General requirements
- 8.3.2 Additional external flushing filters
- 8.4 Minimum flushing time
- 8.4.1 The minimum required flushing time depends on the capacity and complexity of the hydraulic system. Even if fluid samples from the system indicate that the flushing cleanliness level has been reached after only a short period of time, flushing at tur
- 8.4.2 The recommended minimum flushing time before samples are taken, t, can be calculated from Equation (3):
- 8.5 Monitoring the progress of Flushing
- 8.5.1 Options for monitoring
- 8.5.2 Sampling procedures
- 8.6 Flushing procedures
- 8.6.1 General
- 8.6.2 Preliminary stages
- 8.6.3 Stage 1- Flushing at low pressure
- 8.6.4 Stage 2 - Flushing at higher pressures
- 8.6.5 Verification of final cleanliness level
- 9 Identification statement (reference to this International Standard)
- Annex A (informative) )Guidelines for obtaining the Required Cleanliness Level (RCL) for a system
- Annex B (informative) Factors Influencing the effectiveness and duration of flushing
- Bibliography [Go to Page]