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This standard replaces JB/T 7157-1993 Construction machinery - Detection methods for cleanliness of fuel tank.
The following main changes have been made with respect to JB/T 7157-1993:
——The English name of the standard has been added on the front cover;
——The "Foreword" has been added;
——Some editorial changes have been made to the text of the standard.
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of SAC/TC 334 National Technical Committee on Earth-moving Machine of Standardization Administration of China.
The previous edition of this standard is as follows:
——JB/T 7157-1993.
Construction machinery - Detection methods for cleanliness of fuel tank
1 Scope
This standard specifies a method of detecting the cleanliness of construction machinery fuel tanks by weighting method, including detection objects, preparations, impurity collection, impurity detection, impurity analysis and test report.
This standard is applicable to the detection of cleanliness of fuel tanks of the construction machinery powered by internal combustion engines.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
JB/T 7158-2010 Construction machinery - Detection methods for cleanliness of parts
QC/T 571 Work guideline for cleanliness of automobile - Nouns and terms
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in QC/T 571 apply.
4 Detection objects
Detection shall be conducted for the fuel tank before final assembly, including all surfaces of the fuel tank in contact with fuel.
5 Preparations
5.1 The operators, environment and supplies shall be prepared before the detection according to the requirements of JB/T 7158-2010, Clause 5.
5.2 The area around the oil injection hole of the fuel tank shall be cleaned, and no external dirt shall fall into the fuel tank during cleaning.
6 Impurity collection
6.1 Remove the oil injection hole cover of the fuel tank, without causing dirt to fall into the fuel tank.
6.2 Inject cleaner (first-grade solvent oil) into the oil injection hole, and the injection amount shall be as specified in Table 1. Put on the oil injection hole cover and seal other holes, lift the tank with lifting equipment and shake it fully, and then pour the dirty solution generated from cleaning into the container.
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Detection objects
5 Preparations
6 Impurity collection
7 Impurity detection
7.1 Filtration (whole solution through filtering and sample filtering)
7.2 Drying and weighing
8 Impurity analysis
9 Test report
