ISO/TS 17536-2

TC /SC 34 N
Date:
TC /SC 34/WG /N363
ISO/DTS 17536-2
ISO/TC 22/SC 34
Secretariat: JISC
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2)\50.00\180\C088251e_trackchanges.docx

Copyright notice
This ISO document is a working draftDate: 2025-09
Road vehicles — Aerosol separator performance test for internal
combustion engines —
Part 2:
Laboratory test method
Véhicules routiers — Essai de performance du séparateur d'aérosols pour les moteurs à combustion interne —
Partie 2: Méthode d'essai de laboratoire
Document type:
Document subtype:
Document stage:
Document language:
O:\Documents\TC022\SC034\088251 - ISO_AWI TS 17536-2 (Ed
2)\50.00\180\C088251e_trackchanges.docx

ISO/DTS 17536-2:(en)
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Published in Switzerland
iii
ISO/DTS 17536-2:(en)
Contents Page
Foreword . v
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measurement accuracy . 2
5 Test materials and test conditions . 2
6 Test procedure . 2
Annex A (informative) Inlet geometry for equal oil flow challenge . 10
Annex B (normative) Aerosol distribution by mass . 11
Annex C (normative) Aerosol separator laboratory gravimetric test report . 14
Annex D (normative) Test equipment . 21
Annex E (normative) Differential pressure and pressure loss corrections to standard conditions24
Bibliography . 26

iv
ISO/DTS 17536-2:(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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Attention is drawnISO draws attention to the possibility that some of the elementsimplementation of this
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www.iso.org/iso/foreword.htmlISO 17536-2.
This document was prepared by Technical Committee ISO/TC 22, Road Vehiclesvehicles, Subcommittee SC 34,
Propulsion, powertrain and powertrain fluids.
This second edition cancels and replaces the first edition (ISO/TS 17536 consists-2:2017), which has been
technically revised.
The main changes are as follows:
— update of Figure B.1, Table B.1 and Figure C.1the following.
A list of all parts, under in the general title Road Vehicles — Aerosol Seperator performance test for internal
combustion engines:ISO 17536 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.htmlPart 1: General
Part 2: Laboratory test method［Technical Specification］
Part 3: Engine gravimetric test method ［Technical Specification］
Part 4: Laboratory fractional efficiency test method
v
ISO/DTS 17536-2:(en)
Part 5: Engine fractional efficiency test method and upstream distribution sampling method［Technical
Specification］
.
vi
ISO/DTS 17536-2:(en)
Introduction
EngineThe engine crankcase blowby is composed of combustion exhaust gases which have escaped to the
crankcase via piston ring seals and lube oil aerosols generated by thermal and mechanical action within the
engine. These gases shall beare vented from the crankcase to prevent a buildupbuild up of high pressure. The
constituents of vented engine blowby gases are recognized as an undesirable contaminant and technology for
their containment is therefore evolving.
The device, used to separate oil aerosols from the blowby, typically releases cleaned gases to the atmosphere
or alternatively returns the cleaned product to the combustion process by feeding into the engine air intake
prior to the turbo compressor (if present) . The latter has led to the requirement for a pressure control device
to isolate the engine crankcase from air intake pressure.
It is the purpose of this part of ISO 17536 document to define standardized and repeatable test procedures for
the evaluation of blowby oil aerosol separators and filtering devices using this laboratory gravimetric test
method.
vii
ISO/DTS 17536-2:(en)
Road vehicles — Aerosol separator performance test for internal
combustion engines —
Part 2:
Laboratory test method
1 Scope
This part of ISO 17536document defines standardized and repeatable test procedures for the evaluation of
blowby oil aerosol separators and filtering devices and specifies laboratory gravimetric separation efficiency
and system pressure tests in both open and closed crankcase ventilation systems. This part of ISO
17536document has a limitation of 0 % – 99 % for aerosol gravimetric efficiency.
NOTE Gravimetric efficiencies > 99% may % can be difficult to measure due to long test durationdurations and
absolute filter weight measurements.
Filter life is not evaluated in this standard. document.
This test method only applies to devices that have a defined tubular inlet, outlet and drain that can be
connected to the test equipment. For devices that lack such connections, for example, one that is built into a
valve cover, see Annex Ainformative Annex A.
Conformance of a device to legislation is outside of the scope of this standard and the appropriate regulations
shall be consulted.
2 Normative references
The following documents, are referred to in wholethe text in such a way that some or in part, are normatively
referenced inall of their content constitutes requirements of this document and are indispensable for its
application. For dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.
ISO 17536-1:2015, Road vehicles –— Aerosol separator performance test for internal combustion engines --—
Part 1: General
3 Terms, and definitions, symbols and units
For the purposes of this part of ISO 17536document, the terms and definitions given in ISO 17536-1 and the
following apply along with the terms listed below.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
3.1 ISO Online browsing platform: available at https://www.iso.org/obp3.1
—
— IEC Electropedia: available at https://www.electropedia.org/
3.23.1
standard flow
flow rate corrected to standard conditions as specified in 5.35.3
ISO/DTS 17536-2:(en)
4 Measurement accuracy
The measurement accuracy of this part of ISO 17536document shall be in accordance with ISO 17536-1:2015,
Clause 3.
5 Test materials and test conditions
5.1 5.1  Test oil
The test oil to be used shall be an oil of such appropriate viscosity and surface tension that the particle size of
50 percent % cumulative mass of the generated aerosol exhibits more than 0,85 μm and less than 0,90 μm.
TestThe test oil shall meet the aerosol distribution by mass given in Annex BAnnex B. . The challenge aerosol
size distribution shall be plotted in Figure C.1Figure C.2.

5.2 5.2 Absolute filter, wall flow trap and leakage
The provisions related to the absolute filter, the downstream wall flow trap and leakage shall be in accordance
with ISO 17536-1:2015, Clause 4.
5.3 5.3 Standard conditions
The standard condition for temperature, humidity, and pressure is 20 °C, 0 % RH, and 101,3 kPa (1 013 mbar).
Airflow differential pressure, inlet and outlet pressure, and pressure loss shall be corrected to that standard
condition.
5.4 5.4 Test temperature
5.4.1 5.4.1 Efficiency tests
The volume directly outside of the unit under test (UUT) and internal temperature of the efficiency test shall
be either:
— Conditioncondition A: 80° °C ± ± 3° °C;
— Conditioncondition B: 23° °C ± ± 5° °C.
The condition that is run shall be documented in the test report (see Table C.1Annex C). ).

5.4.2 5.4.2 Differential pressure, pressure loss, and crankcase pressure control tests

FlowThe flow rate for pressure loss and crankcase pressure control tests shall be corrected to standard flow.
The pressure loss and crankcase pressure control tests shall be conducted with air entering the aerosol
separator at a temperature of 23° °C ± ± 5 ° °C.
6 Test procedure
6.1 6.1  General
Performance tests shall be performed on a complete aerosol separator assembly. The tests shall consist of a
pressure loss test, a gravimetric efficiency test, conditioned gravimetric efficiency test, a crankcase pressure
control test (when pressure regulator is present), and a drain interval test (when applicable).
ISO/DTS 17536-2:(en)
6.2 6.2 Test equipment
NOTE The definitions of the following terms related to the test equipment are defined in ISO 17536-1:2015,
Clause 2; upstream particle counter, particle counter calibration, maximum particle concentration and particle counter
flow.
6.2.1 6.2.1 Typical arrangements to determine the differential pressure or pressure loss to air flow,
efficiency, and crankcase pressure control are shown in Annex DAnnex D.
Use an aerosol generator which is capable of dosing oil mist over the range of delivery rates required as per
customeraccording to the customer's specification.
The aerosol generator shall be validated as follows:
— Fillfill the aerosol generator to a pre-determined level.;
— Simultaneouslysimultaneously start the aerosol generator and timer.
At a time interval relative to a mass oil flow of >1 gram g, determine the amount of aerosol dispersed and
particle size distribution. Continue mass oil flow determinations of the aerosol until the desired oil flow
deviates by < 5 % and shall be > 30 minutes. min. Continue feeding aerosol until the particle distribution does
not meet the Annex BAnnex B specification (to understand time capability to deliver a distribution per
Annex BAnnex B). ).
Adjust the aerosol generator until the average delivery rate is within ±5 % of the desired rate and deviation in
the delivery rate from the average is not more than ±5 % for the entire designated test duration.
After verifying the delivery rate, verify the aerosol delivered from the aerosol generator for the entire test
duration is within the Annex BAnnex B specifications.
6.2.2 6.2.2 An upstream wall flow trap should be used between the oil mist generator and the inlet tube
to eliminate any oil wall fowflow to the inlet tube. Use a wall flow trap conforming to ISO 17536-1:2015,
Annex I.
6.2.3 6.2.3 Use an inlet piezometer tube conforming to ISO 17536-1:2015, Figure B.2. The cross-section
shall be the same as the aerosol separator inlet. In the case of non-uniform flow conditions caused by special
inlet tubes, special precautions may be required.
6.2.4 6.2.4 Use a manometer or other differential pressure measuring device with the specified accuracy
described in ISO 17536-1:2015, Clause 3.
6.2.5 6.2.5 Setup test with no UUT present, (ex. Straight (e.g. straight pipe).
6.2.6 6.2.6 A downstream wall flow trap should be used between the unit under test and the outlet
piezometer tube described in 6.2.36.2.3 to eliminate any oil wall flow. Use a wall flow trap conforming to ISO
17536-1:2015, Annex I.
6.2.7 6.2.7 Use an outlet tube conforming to ISO 17536-1:2015, Figure B.2. The cross-section shall be the
same as the aerosol separator outlet. In the case of non-uniform flow conditions caused by special inlet tubes,
special precautions may be required.
6.2.8 6.2.8 Use an air flow rate measuring system having the accuracy described in ISO 17536-1:2015,
Clause 3. FlowThe flow rate for differential pressure and crankcase pressure control tests shall be standard
flow, which is the volume flow rate corrected to standard conditions, specified in 5.35.3.
6.2.9 6.2.9 Use an air flow rate control system with a refresh rate greater than 2 hertz Hz capable of
maintaining the indicated flow rate to within 5 % of the selected value at a minimum data record frequency of
2 hertz Hz during a steady-state and variable air flow operation.
ISO/DTS 17536-2:(en)
6.2.10 6.2.10 Use a compressed air/blower/exhauster for controlling the air flow through the system, which
has adequate flow rate and pressure characteristics for the oil separators to be tested.
6.2.11 6.2.11 If the unit under test has a pressure regulator or bypass, the use of a blower/exhauster on the
downstream of the system can be used to regulate the pressure on the outlet of the unit under test.UUT.
Devices with pressure regulators shall have air pushed through the inlet, because the pressure regulator
device regulates the amount of negative vacuum allowed on the system.
6.2.12 6.2.12 Grounding is required for all test apparatus to reduce the effects of static charges and to
improve the consistency of the test results. Grounding of metallic and non-metallic surfaces, housings,
transport tubes, injectors and associated hardware is recommended.

6.3 6.3  Pressure loss test
6.3.1 6.3.1 The purpose of this test is to determine the pressure loss across the unit under test UUT which
will resultoccur when air is passedpasses through under predetermined conditions. AirflowThe airflow
differential pressure is measured with a clean aerosol separator with at least four equally spaced air flows or
as agreed upon between the customer and supplier.
6.3.2 6.3.2 Set up the UUT as shown in ISO 17536-1:2015, Figure B.1, Figure D.1, or Figure D.3. Seal all
joints to prevent air leaks. Connect piezometer tubes to the inlet and outlet of the unit under test.
PiezometerUUT. The piezometer tube shall be sized to the size of the inlet and outlet of UUT.
NOTE Care should be taken to understand the product components that may affect the flow path during a pressure loss
test. (ex. Pressure regulators)
6.3.3 6.3.3 Record the inlet temperature, barometric pressure, and relative humidity.
6.3.4 6.3.4 Measure and record the differential pressure, and upstream absolute pressure of unit under
testthe UUT versus the air flow rate at a minimum of four equally spaced air flows or flow rates agreed upon
between the customer and supplier.
6.3.5 6.3.5 Record the inlet temperature, barometric pressure, and relative humidity.
6.3.6 6.3.6 Recorded differential pressure readings shall be corrected to standard conditions in
accordance with Annex EAnnex E.
6.3.7 6.3.7 For pressure loss determination, use the formula given in Annex A of ISO 17536-1:2015,
Annex A.
6.3.8 6.3.8   Plot the pressure loss as shown in Figure C.2Figure C.3 or equivalent.
6.4 6.4   Gravimetric efficiency test
6.4.1 6.4.1 The purpose of the gravimetric efficiency test is to determine the gravimetric separation
efficiency of a device in two conditions:
a) new state;
b) conditioned state as specified in 6.5per 6.5. .
The test duration for a gravimetric efficiency test shall be a minimum of 30 minutes min and the minimum
mass gained on the absolute filter shall be 0.,1 grams. g. Additional time may be needed to achieve the absolute
filter weight gain requirement. The weight changes of the component parts and the absolute filter during the
test duration are used to calculate the new and conditioned state gravimetric efficiency.
High efficiency separators shall not exceed 3 hours h for 6.4.16.4.1, (, a) testing, as the new state is no longer
maintained. For such separators, 6.56.5 and 6.66.6 shall be performed to complete an efficiency evaluation on
ISO/DTS 17536-2:(en)
the product and shall meet the above minimum requirements of 30 minutes min and 0.,1 gram g on the
absolute filter.
NOTE The higher efficiency separators maycan require additional time to achieve the specified absolute filter weight
gain requirement.
6.4.2 6.4.2 The mass oil flow is agreed upon by the user and manufacturer.

NOTE Care should be taken to understand that mass oil flow may affect the challenge aerosol size distribution.

6.4.3 6.4.3 Weigh and record the unit under testUUT.

6.4.4 6.4.4 Weigh and record the drainage vessel (if present).

6.4.5 6.4.5 Weigh the absolute filter as specified in ISO 17536-1:2015, 4.1.2 and record the mass before
assembly within the absolute filter housing.

6.4.6 6.4.6 Weigh the downstream wall flow trap of the unit under testUUT as specified in ISO 17536-
1:2015, 4.2.1.
6.4.7 6.4.7 Setup the test stand as shown in Figure D.2Figure D.2 or Figure D.4Figure D.4 for all aerosol
separators. Seal all joints to prevent air leakage. OrientationThe orientation of the unit under testUUT shall be
as in application.
NOTE Care should be taken to understand the product components that may affect the flow path during a pressure loss
test. (ex. Pressure regulators)
6.4.8 6.4.8 Record the UUT external air temperature, pressure, and relative humidity.

6.4.9 6.4.9 Start the air flow through the test stand per 5.4.1as specified in 5.4.1 and stabilize at the test
flow as specified in 6.2.86.2.8. . Record the differential pressure.
6.4.10 Set the feed rate to the pre-determined oil flow. Start the aerosol generator.

6.4.11 6.4.11 The differential pressure shall be compensated for the increased differential pressure that the
tubing and downstream wall flow trap between the unit under testUUT and the piezometer introduces, since
the downstream wall flow trap will be in this area. The downstream wall flow trap is present to protect the
downstream piezometer from contamination of liquid oil wall flow. The pressure loss of the downstream wall
flow trap shall be subtracted from the overall pressure loss.

6.4.12 6.4.12 Every 10 minutes min, record the differential pressure at the air test flow and the elapsed test
time.
ISO/DTS 17536-2:(en)
6.4.13 6.4.13 Record the differential pressure at the end of test before interrupting either the air flow rate
or mass oil flow to remove the absolute filter.

6.4.14 6.4.14 Stop the aerosol generator and continue to run the air flow rate for 15 s – 30 seconds s, this
will evacuate the test stand of aerosol.

6.4.15 6.4.15 Stop the air flow rate.

6.4.16 6.4.16 Record the UUT external air temperature, pressure and relative humidity.

6.4.17 6.4.17 Weigh the unit under test. UUT. Note any evidence of seal leakage or unusual conditions. The
increase in mass of the unit under test UUT is the mass measured minus the mass recorded in 06.4.3.
NOTE Carefully weigh allAll components are weighed carefully so as not to lose any oil or mass.
6.4.18 6.4.18 Remove the absolute filter. Repeat 0step 6.4.5 and determine the difference i
...