GB/T 41481-2022 English PDF (GBT41481-2022)

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GB/T 41481-2022: Road vehicles - Cleanliness of components and systems
GB/T 41481-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.180
CCS R 16
GB/T 41481-2022 / ISO 16232:2018
Road Vehicles – Cleanliness of Components and Systems
(ISO 16232:2018, IDT)
ISSUED ON: JULY 11, 2022
IMPLEMENTED ON: NOVEMBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Symbols and Abbreviated Terms ... 16
5 Cleanliness Inspection Principles ... 18
6 Qualification Tests and Blank Level ... 22
7 Extraction Methods ... 31
8 Analysis Filtration ... 57
9 Analysis Methods ... 64
10 Documentation ... 108
11 Handling Components Cleanly ... 127
12 Designation ... 130
Annex A (Informative) Selecting Contamination Extraction and Analysis Procedures
... 131
Annex B (Normative) Qualification Tests and Blank Level ... 143
Annex C (Informative) Recovering Test Particles ... 148
Annex D (Normative) Extraction ... 150
Annex E (Informative) Filtration ... 164
Annex F (Normative) Analysis Methods ... 170
Annex G (Informative) Documentation ... 182
Annex H (Informative) Cleanliness Specification... 185
Annex I (Informative) Technical Cleanliness - Interpretation and Reaction ... 197
Annex J (Informative) Staff Training ... 199
Annex K (Informative) Work Safety and Protection of the Environment ... 201
Bibliography ... 206
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This Document equivalently adopted ISO 16232:2018 Road Vehicles – Cleanliness of
Components and Systems.
The following minimal editorial changes have been made to this Document:
--- Delete Annex L (Informative) of ISO 16232:2018.
Please note some contents of this Document may involve patents. The issuing agency of this
Document shall not assume the responsibility to identify these patents.
This Document was proposed by the Ministry of Industry and Information Technology of PRC.
This Document shall be under the jurisdiction of the National Technical Committee of Auto
Standardization (SAC/TC 114).
Drafting organizations of this Document: Shanghai Mingxing Kaicheng Ultrasonic Technology
Co., Ltd.; Shanghai Suying Cleanliness Technology Development Co., Ltd.; Jomesa
Measurement System (China) Co., Ltd.; Shanghai Jiao Tong University; Shanghai Normal
University; Pan-Asia Technical Automotive Center Co., Ltd.; and SAIC Maxus Automotive Co.,
Ltd.
Chief drafting staffs of this Document: Zhong Jiancheng, Liu Bo, Lian Fengqi, Xu Qunhui,
Zhang Qiuhong, Wang Lei, Zhang Zhinan, Shangguan Qianqian, Tang Ning, and Zhou Lin.
Road Vehicles – Cleanliness of Components and Systems
1 Scope
WARNING: The use of this document can involve hazardous materials, operations and
equipment. This document does not purport to address all of the safety problems
associated with its use. It is the responsibility of the user of this document to establish
appropriate safety and health practices and to determine the applicability of any other
restrictions prior to its use.
This document specifies requirements for applying and documenting methods for determining
particulate contamination on functionally-relevant components and systems (cleanliness
inspection) of road vehicles.
A cleanliness inspection comprises the basis of an assessment of technical cleanliness, which
is performed, for example, under the following circumstances:
--- initial inspection and evaluation;
--- inspection of incoming and outgoing components; and
--- quality control or monitoring of manufacturing processes relevant to cleanliness (e.g.
cleaning, surface treatment and assembly processes).
This document is intended to improve the informative quality and comparability of test results.
It also defines the standardized expression of cleanliness specifications and cleanliness test
results in the quality chain of the automotive industry.
This document does not apply to the following:
--- detection of filmy contamination (grease, oils, etc.);
--- application of non-quantifiable particulate detection methods on test components (e.g.,
visual assessment, wipe test with clean cloth, etc.); and
--- characterization of operating fluids (fuel, oils, coolants, brake fluid, etc.).
This document does not define any cleanliness limit values for specific components or systems.
The degree of cleanliness required for a specific component or system is dependent on a number
of highly individual factors. Cleanliness specifications are intended to be undertaken only by
specialists who not only know the component concerned but also the system it is built into, the
later conditions of use, technically-feasible practices and possible consequences for
manufacturing processes and the supply chain. Guidance for deriving limit values can be found
in Annex H.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
ISO 11500 Hydraulic Fluid Power – Determination of the Particulate Contamination Level
of a Liquid Sample by Automatic Particle Counting Using the Light-Extinction Principle
NOTE: GB/T 37163-2018 Hydraulic Fluid Power - Determination of the Particulate Contamination
Level of a Liquid Sample by Automatic Particle Counting Using the Light-Extinction Principle
(ISO 11500:2008, MOD)
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply.
3.1 Active component
Component which may set the fluid in motion or be activated by the fluid during operation.
EXAMPLE: Pump, cylinder, distributor, injector, valve regulator.
3.2 Aerosol formation
Atomization of a liquid to create small droplets.
NOTE: e.g., in pressure-rinsing due to the shape of nozzles or impaction of the pressure-rinsing jet on a
surface.
3.3 Agglomerate
Two or more particles which are in intimate contact and cannot be separated by gentle stirring
and the small shear forces thus generated.
3.4 Agitation
Extraction method implemented for internal surfaces.
NOTE: Its cleaning effect is based on the turbulent change in direction of the test liquid inside the
component.
3.5 Air cleanliness class
Specification of air quality based on the concentration of particles in a defined volume of air.