ISO/DIS 19713-2
(Main)Road vehicles -- Inlet air cleaning equipment for internal combustion engines and compressors
Road vehicles -- Inlet air cleaning equipment for internal combustion engines and compressors
Véhicules routiers -- Équipement d'épuration d'air d'entrée pour moteurs à combustion interne et compresseurs
General Information
Standards Content (sample)
DRAFT INTERNATIONAL STANDARD ISO/DIS 19713-2
ISO/TC 22/SC 7 Secretariat: DIN
Voting begins on: Voting terminates on:
2008-08-04 2009-01-04
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Road vehicles — Inlet air cleaning equipment for internalcombustion engines and compressors —
Part 2:
Fractional efficiency testing with coarse particles (5µm to
40µm optical diameter)
Véhicules routiers — Équipement d'épuration d'air d'entrée pour moteurs à combustion interne et
compresseurs —Partie 2: Contrôle d'efficacité fractionnelle avec grosses particules (diamètre optique de 5 µm à 40 µm)
ICS 43.060.20In accordance with the provisions of Council Resolution 15/1993 this document is circulated in
the English language only.Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué
en version anglaise seulement.To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.International Organization for Standardization, 2008
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ISO/DIS 19713-2
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ii ISO 2008 – All rights reserved
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ISO/DIS 19713-2
Contents Page
Foreword ............................................................................................................................................................iv
Introduction.........................................................................................................................................................v
1 Scope......................................................................................................................................................1
2 Normative references............................................................................................................................1
3 Terms and definitions ...........................................................................................................................1
4 Test equipment, accuracy and validation...........................................................................................4
4.1 Measurement accuracy.........................................................................................................................4
4.2 Test stand configuration.......................................................................................................................5
4.3 Test conditions ....................................................................................................................................12
4.4 Validation .............................................................................................................................................12
4.5 Reference air cleaner assemblies/air filter elements.......................................................................13
4.6 Routine operating procedure .............................................................................................................13
5 Fractional efficiency test ....................................................................................................................13
Annex A (informative) Test report .................................................................................................................15
Annex B (normative) Efficiency data reduction ...........................................................................................17
Annex C (normative) Pressure loss data reduction.....................................................................................24
Annex D (informative) Determination of maximum efficiency aerosol concentration.............................25
Annex E (normative) Accuracy requirements, validation, and routine operation ....................................26
Annex F (informative) Particle diameters .....................................................................................................29
Annex G (normative) Aerosol isokinetic sampling ......................................................................................31
Annex H (normative) Fractional efficiency, E (%) ......................................................................................35
f,iBibliography......................................................................................................................................................36
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ISO/DIS 19713-2
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 ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 19713-2 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 7, Injection
equipment and filters for use on road vehichles.ISO 19713 consists of the following parts, under the general title Road vehicles — Inlet air cleaning equipment
for internal combustion engines and compressors:⎯ Part 1: Fractional efficiency testing with fine particles (0,3 μm to 5 μm optical diameter)
⎯ Part 2: Fractional efficiency testing with coarse particles (5 μm to 40 μm optical diameter)
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ISO/DIS 19713-2
Introduction
The following engine air cleaner/filter fractional efficiency test standard has been developed to cover
traditional and new particulate air filters to remove airborne contaminants specifically to protect the engine.
Air cleaner fractional efficiency is one of the main air cleaner performance characteristics. This test standard
has been established to address the measurement of this parameter. The objective of this procedure is to
maintain a uniform test method for evaluating fractional efficiency of air cleaners and air filters on specified
laboratory test stands.The data collected according to this test standard can be used to establish fractional efficiency characteristic
for air cleaners and filters tested in this manner. The actual field operating conditions, including contaminants,
humidity, temperature, mechanical vibration, flow pulsation, etc. are difficult to duplicate. However, with the
procedure and equipment set forth, comparison of air filter fractional efficiency may be made with a high
degree of confidence.Annexes B, C, E, G and H are normative. Annexes A, D, and F are informative.
© ISO 2008 – All rights reserved v
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DRAFT INTERNATIONAL STANDARD ISO/DIS 19713-2
Road vehicles — Inlet air cleaning equipment for internal
combustion engines and compressors —
Part 2:
Fractional efficiency testing with coarse particles (5µm to
40µm optical diameter)
1 Scope
This part of ISO 19713 describes laboratory test methods to measure engine air cleaner and filter
performance by fractional efficiency test from 5 µm to 40 µm using ISO 12103-1 test dusts. See ISO 19713-1
for fractional efficiency test for particles from 0,3 µm to 5 µm. Performance includes, but is not limited to, air
flow restriction or pressure loss, initial and incremental fractional efficiencies during dust loading.
2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.ISO 19713-1, Inlet air cleaning equipment for internal combustion engines and compressores — Part 1:
Fractional efficiency testing with fine particlesISO 5011, Inlet air cleaning equipment for internal combustion engines and compressors - Performance
testingISO/DP 11841, Road vehicles and internal combustion engines - Filter vocabulary — Part 1: Definitions of
filters and filter componentsISO 12103-1, Road vehicles- Test dust for filter evaluation — Part 1: Arizona test dust
ISO/TS 11155-1, Road vehicles - Air filters for passenger compartment — Part 1: Test for particulate filtration
ASTM F 328, Practice for determining counting and sizing accuracy of an airborne particle measurement
device using near-mono-dispersed spherical particular materials (ASTM, 1916 Race Street, Philadelphia, PA
19103-1187, USA)ASHRAE 52.2, General Method of testing general ventilation air-cleaning devices for removal efficiency by
particulate size (ASHRAE, 1791 Tullie Circle, N.E., Atlanta, GA 30329, USA)3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
air cleaner assembly
the air cleaner assembly includes the air cleaner housing and the air filter element
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ISO/DIS 19713-2
3.1.1
single stage air cleaner
air cleaner which does not incorporate a separate pre-cleaner
3.1.2
multistage air cleaner
air cleaner consisting of two or more stages, the first usually being a pre-cleaner, followed by one or more
filter elementsNOTE If two elements are used, the first is called the primary element and the second one is called the secondary
element.3.1.3
pre-cleaner
device usually using inertial or centrifugal means to remove a portion of the test dust before reaching the filter
element3.2
air filter element
the actual filter supported and sealed within the air cleaner assembly
3.3
test air flow rates
a measure of the volume of air passing through the test duct per unit time
NOTE Expressed in cubic meters per second (m³/s).
3.4
pressure loss
permanent pressure reduction due to a decrease in the flow energy (velocity head) caused by the filter (Pa at
standard conditions of 20 ºC and 101,3 kPa)3.5
fractional efficiency, E (%)
f,i
ability of the air filter to remove particles of a specified size expressed as a percentage for particle size i
C C1i 2i
= ×100 (1)
E f ,i
where: C = number of particles per unit volume of specified size, i upstream
C = number of particles per unit volume of specified size, i downstream
3.6
definition of different fractional efficiencies
3.6.1
fractional efficiency before dust loading
efficiency before the collected particles have any measurable effect on the efficiency of the filter under test
NOTE The collected particles can affect the measured filter efficiency before enough aerosol is collected to have any
measurable effect on the filter pressure loss.3.6.2
incremental fractional efficiency
efficiency, determined at the specified flow rate as a function of particle size at 10 %, 25 %, 50 % and 100 %
of filter life, which is determined by pressure loss across the filter as the filter is loaded with ISO 12103-1 test
dust.2 © ISO 2008 – All rights reserved
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ISO/DIS 19713-2
NOTE 1 The filter pressure loss (ΔP) values at which the incremental fractional efficiencies are measured can be
calculated from: the initial pressure loss (ΔP ), the fraction of filter life (ΔL), and the specified terminal pressure loss (ΔP ).
o i dSee Equation 2.
ΔP=ΔP+ΔL× (ΔP −ΔP )
i o i d o
(2)
NOTE 2 If necessary, the requester and the tester may agree upon different criteria for incremental fractional efficiency.
3.7fractional penetration, P (%)
f,i
ratio of the concentration of particles of specified size exiting the filter to the concentration of particles of
specified size entering the filter expressed in a percentage for particle size i(3)
= 100− E
f ,i
f ,i
3.8
test dust loading
mass of test dust collected by the air cleaner assembly or air filter element at a specified flow rate expressed
in grams3.9
particle measurement device / aerosol spectrometer
instrument for sizing and/or counting aerosol particles
NOTE Recommended particle counters are optical particle counters (OPC) or other counters demonstrating good
correlation in measuring particle sizes such as aerodynamic particle counters (APC).
3.10test aerosol
particles suspended in air, used for filter efficiency evaluation or dust loading
3.10.1fractional efficiency test aerosol
aerosol used to measure the efficiency of the test filter, the concentration of which is low enough to prevent
coincidence related errors in the particle counters, and does not change the filter efficiency due to loading; for
this part of ISO 19713, the KCl (potassium chloride) test aerosol shall be usedNOTE The aerosol charge is reduced so that it approximates a Boltzman equilibrium charge distribution. The
requirements for the efficiency challenge aerosol are given in sections 5.2.9 and 5.2.10.
3.10.2loading test aerosol
aerosol used to load the filter, the concentration of which is high enough to allow loading of the filter in a
reasonable amount of time; for this part of ISO 19713 for single-stage air cleaner assemblies and air filter
elements, ISO 12103-1 A2 test dust and for pre-cleaners and multistage air cleaner assemblies ISO 12103-1
A4 test dust shall be usedNOTE The requirements for the loading test aerosol are given in section 5.2.12.1.
3.11correlation ratio, R
ratio of the number of particles observed at the downstream sampling location to the number of particles at the
upstream sampling location when no filter is installed in the test systemNOTE 1 This number may be greater or less than 1.
NOTE 2 The method of calculating the correlation ratio is given in Annex B.
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ISO/DIS 19713-2
3.12
Log mean diameter, D
l,i
weighted mean diameter calculated by
1/ 2
D =()D× D (4)
li i i
where
D = log mean diameter.
l,i
D = lower threshold of particle size range.
D = upper threshold of particle size range.
i+1
3.13
geometric (volume equivalent) diameter, D
g,i
diameter of a sphere with the same volume as the particle being measured
NOTE For a spherical particle, it is the diameter of the sphere.
3.14
optical (equivalent) diameter, D
o,i
diameter of a particle of the type used to calibrate an optical sizing instrument that scatters the same amount
of light as the particle being measuredNOTE Optical diameter depends on the instrument, the type of particle used to calibrate the instrument (usually
polystyrene latex spheres), the optical properties of the particle being measured, and the size of the particle.
3.15aerodynamic (equivalent) diameter, D
diameter of a sphere of density 1 g/cm with the same terminal velocity due to gravitational force in calm air,
as the particle being measuredNOTE 1 The aerodynamic diameter will be used to report results to avoid different diameter measures due to different
sizing and counting techniques.NOTE 2 Annex F provides additional information about aerodynamic diameter.
3.16
High Efficiency Particulate Air
HEPA
for this part of ISO 19713, HEPA is defined as a filter having 99,95 % efficiency at most penetrating particle
size (class H13 according to EN 1822) or 99,97 % (or higher) fractional efficiency at 0,3 µm using DOP
aerosol as defined by IEST RPCC001 recommended practice3.17
neutralization
aerosol whose charge distribution is reduced until it provides a Boltzman equilibrium charge distribution
4 Test equipment, accuracy and validation4.1 Measurement accuracy
Accuracy requirements are given in Annex E, Table E.1.
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ISO/DIS 19713-2
4.2 Test stand configuration
Complete OEM air cleaner assemblies or individual air filter elements may be tested. The test stand shall
consist of the following major components and shall be arranged as shown in Figure 2.
NOTE 1 Depending on configuration results may vary.NOTE 2 Air cleaner assembly orientation will affect performance. It is recommended that air cleaner assemblies will be
oriented and tested as installed in the vehicle.Figure 2 shows a set up to measure the performance of an air cleaner assembly.
Figure 3 shows a recommended air cleaner housing to measure the performance of a panel type air filter
element.Figure 4 shows a recommended air cleaner housing to measure the performance of a cylindrical type air filter
element4.2.1 Unit under test
The unit under test may be an air cleaner housing with filter element or elements or it may be a housing
designed to hold a filter element with appropriate inlet and outlets. The unit under test may be or may include
a pre-cleaner. The scope of this test procedure does not include the testing of air cleaner systems without
tubular inlet and outlet connections. However designs such as perforated or louvered inlet systems could be
tested with the unit under test inside a plenum that would include a tubular inlet. Non-tubular air cleaner
systems outside the scope of this test procedure may still be evaluated as agreed upon between the tester
and customer.4.2.1.1 Air cleaner assembly
Air cleaner assemblies will be evaluated using the set up shown in Figure 2.
4.2.1.2 Evaluating panel air filter elements
In general, panel type air filter elements may be tested using the recommended housing shown in Figure 3.
4.2.1.3 Evaluating cylindrical/round air filter elementsFigure 4 shows a recommended housing to test cylindrical type air filter elements. This housing design is
similar to the one recommended in ISO 5011.4.2.2 Ducting
Upstream and downstream cylindrical ducting shall be made of conductive material and all components shall be
commonly grounded from the aerosol inlet section to the downstream sampling section.
4.2.3 Air flow conditioningInlet air shall be conditioned according to requirements of ISO 5011 (23 °C ± 5 °C and 55 % r.h. ± 15 % r.h.).
The inlet air shall be filtered with a HEPA filter if the background particle concentration exceeds the definition
in Annex E.4.2.4 Test configurations
The upstream and downstream ducting can be constructed vertically (recommended), horizontally or a
combination based on space constraints. The example in this procedure shows a vertical configuration to test
both air cleaners and panel type air filters. Preferable the particle samplers should be located vertically in each
test section, which reduces the probability of particle loss and enable sampling of large particle sizes of
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ISO/DIS 19713-2
interest. The underlying test system design will reduce particle losses and meet the requirements of Table E.1
and E.2 in Annex E.4.2.5 Air flow ducting
The test system should be capable of handling user specified flow rates. Further, the test system will maintain
the required flow rates with air cleaner assembly pressure loss up to 10 kPa. Primary duct sizing shall conform
to the following 'nominal' duct diameter and Reynolds Numbers in Table 1 below. Higher and lower flow rates
may use duct sizes scaled appropriately.Table 1 — Duct diameter vs. flow range
Nominal
Flow range Flow range
duct Area Velocity Reynolds Number
low high
diameter
2 3 3
mm m m/s m/h m /h at low flow at high flow
50 0.00202 11.6 85 425 40.407 202.034
100 0.0081 5.8 170 850 40.407 202.034
150 0.0182 5.2 340 1.700 53.876 269.378
200 0.0324 5.8 680 3.400 80.813 404.067
NOTE A 10 µm particle with a specific gravity of 2 settles at about 6 x10 m/s in still air. At the minimum velocity of
approximately 5.1 m/s this would result in a 10 mm drop in that 10 µm particle over a 3 m run.
4.2.6 Inlet filtrationTest inlet air flow shall be filtered with a HEPA filter to remove the majority of ambient aerosol if required
according to Annex E.4.2.7 Flow uniformity
The test system shall be designed to provide uniform and steady air flow to the air cleaner assembly or to the
air filter element under test as stated in the test set up.NOTE Uniform air flow is required in sections where isokinetic samplers are located when evaluating air cleaner
assemblies. Proper flow distribution will facilitate a representative aerosol sample being drawn by the isokinetic samplers.
Refer to 5.2.9.3 for flow uniformity measurements.4.2.8 Leakage
It is important to minimize leakage into the test system to obtain valid data. Depending on where the leakage
occurs, it can cause major errors in particle counting.As a minimum all connections and joints should be checked for visual leakage using soap bubbles. Any
known soap solution can be used for the test. Preferably, the soap solution [foam] will be applied using a
brush at all connections and joints. Leaks are especially important on the clean side of the air cleaner.
4.2.9 Fractional efficiency test aerosol generatorThe aerosol generator for fractional efficiency tests shall provide a stable and homogenous aerosol
concentration and size distribution. The size distribution of the aerosol shall have sufficient particles for
statistical evaluation in each size class as explained in Annex B.6. If high-resolution particle spectrometers are
used, size classes may be combined to achieve the required counts. The total concentration of the aerosol in
the test duct shall not exceed the limit of the particle counter discussed in 5.2.13.2. The efficiency test aerosol
concentration shall be low enough so there is no change in efficiency during the test as described in 6.1. (i.e.
no loading effects).6 © ISO 2008 – All rights reserved
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ISO/DIS 19713-2
4.2.9.1 Aerosol generation
Test dust and aerosol generation shall follow ISO 5011 subclause 6.2.1 through 6.2.5.
4.2.9.2 Aerosol dispersionThe efficiency test aerosol should be injected with the air flow according to Figure 2 (refer to ISO 5011
subclause 6.2.1 through 6.2.5.).4.2.9.3 Aerosol uniformity
During Validation of uniformity and concentration of the efficiency test aerosol, no air cleaner shall be installed
in the location of the test filter (see Figure 2). Instead, a smooth straight pipe or an elbow may be used. The
uniformity of the particle size distribution and the concentration of the test aerosol used for fractional efficiency
tests may be verified by use of a particle-sizing instrument that will also be used in the test system. This
particle-sizing instrument shall draw samples upstream and downstream of the air cleaner mounting position
using the isokinetic samplers. For each test duct the minimum and maximum flow rate will be used for this
evaluation [refer table 1] Samples shall be drawn by the isokinetic samplers along a diameter at 3 locations.
Locations will be 0,15 D, 0,5 D and 0,85 D [refer to Figure 1]. The measurements will be performed in a plane
along two perpendicular diameters. A minimum of 3 samples shall be drawn at each sampling location, and
the resulting number distribution shall be averaged. As far as possible, the samples will be taken at random.
The average values for each reported particle-size range shall not vary by more than ± 10 % for channels less
than 15 µm particles and ± 20 % for channels greater than 15 µm particles among the 5 locations. This
indicates that the efficiency test aerosol is uniformly distributed across the test duct, and that the centerline
sample is representative of the overall challenge.NOTE Sampling positions horizontal: 0,15 × tube diameter; 0,5 × tube diameter; 0,85 × tube diameter
Sampling positions vertical: 0,15 × tube diameter; 0,85 × tube diameterFigure 1 — Location of isokinetic sampling points for validation.
4.2.10 Aerosol neutralizer for coarse test dust
Neutralization is not used in this part of the standard.
4.2.11 Upstream and downstream sample probes
Sampling probes shall be isokinetic (local velocity of duct and probe to be equal) to within ± 20 %. The same
probe design should be used upstream and downstream the filter. Sampling probes shall be located on the
centreline of the test duct. Sample probes shall be located at least 7 diameters downstream of any bends,
reducers, expanders etc. The sampling probe shall be at least 4 diameters upstream of any bends, reducers,
expanders etc. The samplers will also be located in the centre of duct. The probes shall be made of
electrically conductive metallic tubing with a smooth inside surface. The design of the probes and sampling
lines will reduce particle losses. The inlet of the sampling probes shall be sharp edged and shall be located
near the centre of the duct. Both the upstream/downstream sampling lines should be identical, straight (or no
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ISO/DIS 19713-2
more than one bend) and as short as possible. Refer to Annex I for details on isokinetic sampling. A short
(≤ 50 mm) flexible connection to the particle counter may be used to allow some flexibility and reduce stress
on the counter inlet. PTFE may not be used as flexible tubing. Use conductive tubing [e.g. plasticize PVC]
instead. For more information on tubing, refer to Bibliography.Sampling probe ducting to the particle counter must be set up in a way that no sedimentation of large particles
takes place, i.e.:⎯ vertical orientation of the tubing;
⎯ sufficient flow velocity;
⎯ short connection length between n particle counter and sampling;
⎯ avoidance of bends in the tubing;
⎯ no sharp angles if bends are necessary.
4.2.12 Loading test aerosol generator (refer to ISO 5011)
Aerosol generation shall follow ISO 5011 subclause 6.2.1 through 6.2.5 (see also 5.2.9).
4.2.12.1 Loading test aerosol (air cleaner assembly only)A dust injector (reference ISO 5011, Figure B.2 or B.3) shall be used to disperse the loading test aerosol (ISO
12103-1 test dust). Dust feeder location is shown in Figure 2.4.2.12.2 Loading test aerosol dust feeder
A dust fe
...
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