ISO 4548-1:1997 download

07-12-2021 comment

ISO 4548-1:1997 download.Methods of test for fulif low lubricating oil filters for Internal combustion engines Part 1: Differential pressure/flow characteristics.
ISO 4548 establishes standard test procedures for measuring the performance of I uIl-fbw lubricating oil filters for internal combustion engines, it has been prepared in separate parts, each part relating to a parhcular performance characterisbc.
Together the tests provide the information necessary to assess the characteristics of a filter, but if agreed between the purchaser and the manufacturer, the tests may be conducted separately.
This revision of this part of ISO 4548 has been undertaken in order to align the presentation with the requirements of the current ISO Directives. The principal changes are editoiial, affecting the layout and the texi Minor technical changes comprise the inclusion of ISO VG and SAE od grades for the test liquids, and revision of the test rig dimensions to make them consistent with those specified in ISO 3968. In addition, the flow meter on the test rig has been repositioned downstream of the throttle valve.
This part cA ISO 4548 specWies tests for determkng the differential pressure/how characteristics of tuft-f kw kibncating oil filters for internal combustion engines.
Tests are specified with oils at two viscosities, one to assess the performance of a filter with a cold oil and the other to assess its performance with an oil at a typical operating temperature.
2 NormatIve references
The folowing standar contain provisions which, through reference In this text, constitute provisions of this pert of ISO 4548. At the time of publication, the editions indicated were vad. Al standards are subject to revision and parties to agreement based on this part of ISO 4548 are encouraged to rivestagate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 1219-1:1991, Fluid power systems and coirponents — Graphic syl7tols and circuil dg rams —. Part 1: Graphk
s— ISO 11841-1 :_1), Road vehicles and internal cantiustkn engines — Filter wxabuiaiy — Part 1: DefInitions of Me,s and fifter coirxxents.
ISO 11 841.2:_I), Road vehicles and internal coniiustkri engines Filter vcabuIaiy Part 2: DefInitions of ctenstics of filters and their cot vzionents.
In order to ensure an adequate oil pressure to the engine, it is customary for the filter to be designed to pass its full rated flow with no more than a specified differential pressure. The tests specified In this pen of ISO 4548 measure the differential pressure across a complete filter assembly, in a dean conditxn, over the whole range of oil flow rates.
The differential pressure across the complete filter is due to the pressure at the inlet and outlet any casting or adaptor whh Is part of the filter assembly, and at the anti-drain back valve, if one the differential pressure across the filler element itself. For some purposes, It is necessary to pressure across the filter alone, for example in assesskg the performance of the element combinations of filter medium and contaninant. In addition to the tests indicated above, the tests differential pressure across a clean fitter element over the whole range of oil flow rates.
6 FIlter to be tested
6.1 Filter type
of the fitter, including is fitted, as woW as to know the differential in the case of some specified measure the
For the purpose of mounting the filter under test in the test ng, the following types of fitter are recognised:
a) spinon fillers in which the replaceable unit does not indude a filter head (it may or may not include the element by-pass valve);
7.4.1 In the case of the types of fitter indicated m 6.1 a), a special test head will be required, and a typical example is shown in figure 2. The differential pressure across the complete filter assembly shall be measured using the pressure tappings marked A and B with C removed. The differential pressure across the fitter element shall be measured using an inlet pressure tapping made into the casing surrounding the fitter element and the outlet pressure probe marked C.
7.4.2 In the case of the types of filter indicated in 6.1 b) and 6.1 C), the inlet and outlet pipe bores shall be equivalent to the sizes of the inlet and outlet ports of the fitter. Altematrvely, the sizes of the inlet and outlet pipes shall be as agreed between the manufacturer and the purchaser of the fitter, for example to match the ports in the engine block on which the filter is to be used.
Tappings for the measurement of the difterentiai pressure across the complete filler shall be made at five internal pipe diameters upstream of the filter inlet port and ten internal pçe diameters downstream from the filter outlet port The ket and outlet pipes shall be straight and free from obstruction for eiit Internal pipe diameters upstream and 13 internal pipe diameters downstream of the fitter Inlet and outlet ports.
7.4.3 In the case of the types of filter indicated ii 6.1 b) and 6.1 c), tappings for the measurement of the differential pressure across the fitter element shall be made into the test filter in communication with the upstream and downstream sides of the fitter element. Wherever practicable these tappings shall be positioned to measure the pressure in locations within the filter where the flow is at a low rate and not turbulent. Alternatively, a special test housing may be used for the measurement of the differential pressure across the filter element; a typical housing is
10.1.1 Install the filter under test as shown in figure 1.
10.1.2 Add the required quantity of clean test liquid to the sump 1 and circulate it through the test rig via the bypass pipe only. No test liquid shaft pass through the filter at this stage.
10.13 Switch on the heater or cooler and adjust the thermostat to the required temperature (see clause 8). Allow the temperature to become stabilized.
10.1.4 When the temperature of the odin the sump I has become stabilized, pass the test liquid through the fitter under test at approximately 50 % of its rated flow. Alow the temperature to become stabilized again. Bleed the system, if necessary.
10.1.5 When the temperature indicator 7 shows that the temperature of the od at the filter frlet has become stabilized at the required value, take measurements of the differential pressure across the fitter, at each of at least four flow rates (eight preferred) at approximately equal increments between 10 % and 110 % of the filter rated flow. Obtain the required flow by adjustment of the pressure and flow regulating valves, 3 and 11, ensuring that the inlet pressure exceeds the indicated differential pressure so that a positive pressure is maintained at the filter outlet. Hold the flow constant until the pressure is stabilized before taking each reading of differential pressure.
10.1.6 Carry out the procedure described in 10.1.3 to 10.1.5 for each viscosity oil.
10.2 Test of the fitter element.

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