BS ISO 4548‑5:2020 pdf download.Methods of test for full-flow lubricating oil filters for internal combustion engines.
3 Terms, definitions and graphical symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4548-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.2 Graphical symbols
For the purposes of this document, the graphical symbols given in ISO 1219-1 apply.
4 Operational characteristics to be tested
Filters are subjected in service to pressure fluctuations caused by either engine cold starting conditions or hydraulic pulse events during normal operation. The test specified in Clause 8 can be performed at a range of pressures on separate filters to simulate in-service conditions and verify the capability of the filter canister and seal to withstand these pressures.
5 Test rig
See Figure 1 as an example of a typical test circuit. An alternative test rig, which produces the pressure pulse waveforms shown in Figure 2, may be used.
6 Test fluid
The test fluid shall be oil with a viscosity class ISO VG 22. The temperature shall be 60 °C ± 10 °C, unless otherwise specified.
NOTE The kinematic viscosity of ISO VG22 is 10 mm 2 /s ± 5 mm 2 /s at 63 °C.
7 Accuracy
7.1 The measuring instruments shall be capable of measuring to the levels of accuracy given in Table 1.
The last column in the table gives the limits within which the test conditions shall be maintained.
7.2 Use pressure transducers, amplifiers and recording devices with a combined system frequency
response such that in the frequency range 0 kHz to 2 kHz, the amplitude ratio is within 0 dB to −3 dB.
7.3 Pressure transducer(s) shall be mounted directly into the test component, or as nearly as
possible, so as to record the internal conditions applied to the component. Any restrictions between the transducers and the pressure-containing envelope being tested should be avoided.
7.4 Instruments and procedures should conform to ISO 9110-1 and ISO 9110-2.
8 Hydraulic pulse durability test (see Figure 1)
8.1 Fit a filter on an appropriate adaptor and install the test filter to the filter manufacturer’s
recommended tightening torque or angle of rotation for the filter to be tested. When multiple samples are to be tested for getting the statistically meaningful data, the mean and standard deviation should be calculated and reported. Additionally, the B10 value by Weibull analysis can be calculated and reported when tested with more than seven samples.
NOTE Weibull analysis (see Annex B) and the B10 value are described in ISO 19973-1.
8.2 Connect the test adaptor to the pipework system of the test rig.BS ISO 4548‑5 pdf download.