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ISO 12345 pdf free download

ISO 12345-2021 pdf free download.Diesel engines一Cleanliness assessment of fuel injection equipment.
5 Procedure
5.1 General
All tests should be carried out in a clean laboratory environment. Failure to achieve a satisfactory blank level test of contamination could indicate unsuitable control of test conditions (see Cl). Clean room conditions according to ISO 14644-1, class 8, shall be employed as a minimum for these procedures, unless a suitable alternative can be demonstrated.
Before starting the test procedure, the outer surface of the component or assembly should be thoroughly cleaned by using a solvent such as detailed in 412.
This document covers the following components of the fuel injection equipment:
a) pumps:
1) high-pressure supply pumps (common rail fuel injection system) (see 52);
2) unit injectors (see £3);
3) fuel injection pumps (see £4);
b) injectors:
1) CR fuel injectors (see 5S);
2) fuel injectors (nozzle holder assemblies) (see £6); c) pipes and rails:
1) high-pressure fuel Injection pipes (see 51);
2) rails(see5.8);
d) low-pressure systems (see £9).
Each of these, in turn, is treated with respect to two procedural areas:
— equipment set-up and verification (the verification corresponds to the qualification test and blank level requested in ISO 16232:2018, Clause 6);
— testing procedure.
In cases where more than one test procedure fora component is specified, the experience has shown that for removal of typical particles produced in the manufacture of these components, the test procedure with a turbulent flow and with pulsating pressure (simulation method) is preferred, simulating actual operating conditions.
When the simulation method is impractical, then the second test procedure should to be used as a more pragmatic means for removal of contaminants.
If neither the simulation method nor the second test procedure prove practical to the supplier or custonier, by agreement a flushing test procedure (syringe or solvent dispenser method) may be used as an alternative.
The determination of:
— the test procedure to be used,
— as well as of the number of components to be tested,
shall be by agreement between the fuel injection equipment supplier and customer.
5.2 High-pressure supply pumps (common rail fuel injection system)
5.2.1 General
This subclause describes two test procedures for checking the cleanliness of high-pressure supply
pu mps
— the preferred test is a dynamic test with the test pump running;
— if the dynamic test is not practical, a flushing test at low speed with the test pump running by hand should be used.
5.2.2 Dynamic test with the test pump running Equipment set up and verification (qualification test and blank level) of cleanliness
a) Set up the equipment for verifying the system as shown in Figure A.1 (see A.2.2. NOTE 3), using
a clean high-pressure supply pump of the same type as to be tested; the test bench shall have a
separate test reservoir for the calibration fluid. Instead of a clean pump a clean dummy or a
hydraulic short cut may be used.
b) The calibration fluid used should be as described In 41.1. pre-filtered using a filter as described In 4.8, permanently fixed in the system and replaced regularly.
c) Verify the system according to AnncxC. Test procedure
a) Replace the clean high-pressure supply pump by the pump to be tested; the pump shall be fully open (any flow regulating devices or throttling devices are not active).
b) Connect a tube to the high-pressure outlet(s) and another one to the low-pressure return flow outlet(s), both without any pressure regulation devices. Only if the pump needs a minimum system pressure for its safe operation, a pressure regulation device may be applied.
c) Run pump on test at  500 mm 1 and similarly but separately collect 11 of test fluid at the high- pressure outlet (s) and 11 at the low-pressure outlet.
d) Separately and similarly measure and count the contaminant output (particles) from every outlet according to Clause 6.ISO 12345 pdf download.

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