GB/Z 42533-2023Hydraulic fluid power - System - Method to relate the cleanliness of a hydraulic system to the cleanliness of the components and hydraulic fluid that make up the system (English PDF)

1 Scope

This document describes the following common methods:

a) Correlate the cleanliness of the system with the cleanliness and oil contamination of the components that make up the system;

b) Predict the final cleanliness of the hydraulic system filled with oil after installation, the final cleanliness prediction is based on each component in the system cleanliness and contamination of the oil used;

c) Calculate and manage the contamination degree requirements of the components, components and oils that make up the system, so as to achieve the ultimate target cleanliness of the system (RCL):

The method specified in this document is applicable to the prediction of particles of any size and can also be used in other fluid systems than hydraulic transmissions:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document:

Note: GB/T 17446-2012 Fluid Power System and Component Vocabulary (ISO 5598:2008, IDT)

3 Terms and Definitions

The terms and definitions defined in ISO 5598 and the following apply to this document:

3:1

Wetted surface area wettedsurfacearea

When the system is in normal operation, the oil contact surface area of the component or system after contacting the system oil:

Note: The symbols AC or AS represent the wetted surface area of the component or system respectively:

Example:

For a hydraulic oil pump with two gears (see Figure 1), the wetted surface area can be calculated as the internal surface area of the pump body (both end covers and casing with inlet and outlet ports) plus

The sum of the outer surfaces of the upper two gears:

Fig:1 Schematic diagram of wetted surface area of external gear hydraulic gear pump

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