ISO 12345:2021 pdf download.Diesel engines — Cleanliness assessment of fuel injection equipment.
4 Test apparatus
Typical test equipment recommended for measuring fuel-injection equipment cleanliness is described in Annex A. In 4.1 to 4.9 are details of specific apparatus that shall be used, unless a suitable alternative can be demonstrated.
4.1 Pressure source
Pressure source is test dependent as described in 4.1.1 to 4.1.7.
4.1.1 Fuel injection pump test bench
A test bench as specified in ISO 4008-1 with a single cylinder pump or one cylinder of an inline pump.
4.1.2 Hand-lever-operated testing and setting apparatus
A testing apparatus as described in ISO 8984-1.
4.1.3 High-pressure pulsating flow rig
A pressuse source capable of achieving:
a) a flow rate which will generate a turbulent flow in the pipes (Re > 4 000) for a period of 30 s ± 1 s,while pulsating the flow between zero and this value at a frequency of 0,2 Hz to 1 Hz, followed by
b) a flush at 1,4 MPa ± 0,1 MPa constant pressure for 15 s ± 1 s.
4.1.4? Verification? low-pressure? pump
A plunger or diaphragm-type pump, having a flow rate of approximately twice the rated value for the component under test at a pressure of at least 2 MPa. The verification low-pressure pump has to be cleaned to the cleanliness level CL in accordance with Annex C. It has to be carefully stored with a proper cover in a clean environment.
4.1.5? Verification? high-pressure? delivery? pump
For testing of high-pressure pipes with open ends, having a flow rate capable of generating a Reynolds number in the pipes of Re > 4 000. A pressure capability of 3 MPa ± 0,1 MPa is considered suitable.
The verification high-pressure delivery pump shall be cleaned to the cleanliness level CL in accordance with Annex C. It shall be carefully stored with a proper cover in a clean environment.
4.1.6 Pressure vessel
Used as pressure source. It shall be able to supply a testing pressure of at least 0,5 MPa (= 5 bar) and to produce a turbulent flow inside the rail (recommended flow rate at least 2,5 l/min).
4.1.7 Flushing pump
Used for testing of rails with open ends, having a flow rate of at least 0,1 l/min. For this pump a pressure capability of up to 0,1 MPa ± 0,01 MPa is considered suitable.
4.2? Verification? high-pressure? pipe? assembly
600 mm long of tube ISO 8535-1 S-2-6-2 1 P 0, as specified in ISO 8535-1, and suitable for the component under test.
Stainless steel tubing should be used because of its resistance to rust and corrosion contamination. The verification high-pressure pipe assembly shall be cleaned to the cleanliness level CL in accordance with Annex C. It shall be carefully stored with proper cover in a clean environment.
4.3 Verificationtest injector
In accordance with ISO 7440-1, fitted with an orifice plate of orifice diameter 2,5 mm. The inlet edge filter shall be removed to improve the particle passage.
The nozzle opening pressure shall be set to 20 7 , 0 +0,3 MPa.
4.4 Collecting vessel
It may be necessary for collecting test fluid downstream from the tested equipment at a flow rate different from that passing through the particle counter, the contamination monitor or the membrane filter.
The collecting vessel may be used for storing test fluid before transfer fluid samples to laboratory
for analysis. A cylindrical stainless steel or glass reservoir with a conical bottom should be used for facilitating further particle collection.
4.5 Verification rail
Needed to establish the cleanliness level CL for the whole rail cleanliness test apparatus.
For the verification the verification rail shall be cleaned to the blank value in accordance with Annex C and carefully stored with proper cover in a clean environment.
4.6 Equipment for contamination measurement
Involving the application of two specific techniques for evaluating the level of contamination:
— gravimetric analysis;
— microscopic examination.
Each requires the specific laboratory apparatus as given in 4.6.1 and 4.6.2.
4.6.1 Gravimetric analysis apparatus
See ISO 16232:2018, 9.2.2.
4.6.1.1 Non-ventilated drying oven
Capable of maintaining a temperature of 80 °C ± 2 °C.
4.6.1.2 Filter holder
Comprising:
— glass funnel of at least 300 ml capacity with suitably calibrated volumetric graduations (e.g.
25 ml ± 2 ml),
— suitable cover for the funnel (e.g. petri dish),
— clamping device,
— suitable base to support the membrane filter, and
— a means of dissipating any static electricity generated during the filtering process.
4.6.1.3? Vacuum? flask
Suitable for the filter holder and of capacity enabling it to hold the entire volume of sample liquid without refilling.
4.6.1.4 Vacuum device
Able to generate a vacuum of 86,6 kPa (gauge).ISO 12345 pdf download.ISO 12345 pdf download
