SIST EN 17763:2022
(Main)Centrifuges - Marine fuel centrifuges - Determination of particle separation performance and certified flow rate (CFR) under defined test conditions
Centrifuges - Marine fuel centrifuges - Determination of particle separation performance and certified flow rate (CFR) under defined test conditions
This document specifies the procedure for the determination of the certified flow rate (CFR), a performance parameter for centrifuges, at specific fuel oil viscosities using a defined test oil and a defined test procedure.
This document is applicable to marine fuel centrifuges.
All values reported as CFR capacities are verified measured values on a defined CFR test bench.
Scaling based on Stoke’s law and disc stack design is excluded from this document.
Separation efficiency is determined by a defined particle counting method.
Zentrifugen - Zentrifugen für Schiffskraftstoffe - Bestimmung der Partikelabscheideleistung und der zertifizierten Durchflussrate (CFR) unter definierten Testbedingungen
Dieses Dokument legt das Verfahren zur Bestimmung der zertifizierten Durchflussrate (CFR), eines Leistungsparameters für Zentrifugen, bei spezifischen Schwerölviskositäten unter Zuhilfenahme eines definierten Prüföls und einer definierten Prüfmethode fest.
Dieses Dokument ist anwendbar auf Zentrifugen für Schiffskraftstoffe.
Alle als CFR-Kapazitäten angegebenen Werte sind verifizierte Messwerte, die an einem definierten CFR-Prüfstand erlangt wurden.
Skalierung basierend auf dem Stokes'schen Gesetz sowie Tellerkonstruktionen werden in diesem Dokument nicht behandelt.
Die Abscheideleistung wird durch eine definierte Partikelzählmethode bestimmt.
Centrifugeuses - Centrifugeuses à combustible pour la marine - Détermination des performances de séparation des particules et du débit certifié (CFR) dans des conditions d'essai définies
Le présent document spécifie le mode opératoire permettant de déterminer le débit certifié (CFR), un paramètre de performance pour les centrifugeuses, à des viscosités d'huile lourde spécifiques, en utilisant une huile d'essai définie et un mode opératoire d'essai défini.
Le présent document s'applique aux centrifugeuses à combustible pour la marine.
Toutes les valeurs déclarées comme des capacités CFR sont des valeurs mesurées vérifiées sur un banc d'essai CFR défini.
La mise à l'échelle fondée sur la loi de Stokes et la conception de la pile de disques est exclue du présent document.
L'efficacité de séparation est déterminée par une méthode de comptage des particules définie.
Centrifuge - Centrifuge za ladijska goriva - Določanje učinkovitosti ločevanja delcev in certificirane stopnje pretoka (CFR) pod določenimi preskusnimi pogoji
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 17763:2022
01-december-2022
Centrifuge - Centrifuge za ladijska goriva - Določanje učinkovitosti ločevanja
delcev in certificirane stopnje pretoka (CFR) pod določenimi preskusnimi pogoji
Centrifuges - Marine fuel centrifuges - Determination of particle separation performance
and certified flow rate (CFR) under defined test conditions
Zentrifugen - Zentrifugen für Schiffskraftstoffe - Bestimmung der
Partikelabscheideleistung und der zertifizierten Durchflussrate (CFR) unter definierten
Testbedingungen
Centrifugeuses - Centrifugeuses à combustible pour la marine - Détermination des
performances de séparation des particules et du débit certifié (CFR) dans des conditions
d'essai définies
Ta slovenski standard je istoveten z: EN 17763:2022
ICS:
47.020.20 Ladijski motorji Marine engines and
propulsion systems
SIST EN 17763:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 17763:2022
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SIST EN 17763:2022
EN 17763
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2022
EUROPÄISCHE NORM
ICS 47.020.20; 47.020.30
English Version
Centrifuges - Marine fuel centrifuges - Determination of
particle separation performance and certified flow rate
(CFR) under defined test conditions
Centrifugeuses - Centrifugeuses à combustible pour la Zentrifugen - Zentrifugen für Schiffskraftstoffe -
marine - Détermination des performances de Bestimmung der Partikelabscheideleistung und der
séparation des particules et du débit certifié (CFR) zertifizierten Durchflussrate (CFR) unter definierten
dans des conditions d'essai définies Testbedingungen
This European Standard was approved by CEN on 29 August 2022.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17763:2022 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 17763:2022
EN 17763:2022 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Test arrangements . 6
4.1 Test equipment . 6
4.2 Test media . 8
4.2.1 Test oil specification . 8
4.2.2 Test oil kinematic viscosity . 8
4.2.3 Test oil density . 9
4.2.4 Test oil dispersing additive . 9
4.2.5 Test particle specification . 9
5 Performance test . 9
5.1 Oil viscosity . 9
5.2 Particle concentration . 9
5.3 Dispersing of particles into test medium . 9
5.4 Test sequence . 10
5.5 Test procedure . 10
5.6 Sampling . 10
5.7 Particle counting . 11
6 Analysis . 11
6.1 Calculation of separation efficiency . 11
6.2 Calculation of the 85 % efficiency point . 11
6.3 Correction of measured capacities . 12
6.4 Calculation of certified flow rate (CFR) . 13
7 CFR results for similar machines (scaling) . 13
8 Test report . 13
Annex A (informative) Dispersing the particles in the test medium . 14
Annex B (informative) Regeneration of test particle concentration . 15
Annex C (normative) Particle counting . 16
Annex D (informative) Example of correction of measured capacities . 27
Bibliography . 28
2
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SIST EN 17763:2022
EN 17763:2022 (E)
European foreword
This document (EN 17763:2022) has been prepared by Technical Committee CEN/TC 313 “Centrifuges”,
the secretariat of which is held by SIS.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2023, and conflicting national standards shall be
withdrawn at the latest by April 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
3
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SIST EN 17763:2022
EN 17763:2022 (E)
Introduction
In general, diesel engines for propulsion of ships burn marine residual fuels. Marine residual fuels contain
the residue remaining after lighter fractions have been extracted from the crude oil during various
processes in the oil refinery. They are a blend of this heavy fraction to which other refinery stream
products are added to obtain the desired viscosity grade. Marine residual fuel oils contain elements
inherent to the product itself but they also contain some contaminants, which either are due to an
external contamination or enter into the fuel at the refinery during production, such as catalyst fines
which are small fragments of a catalyst, used in the catalytic cracking stage in order to cut long molecule
chains into smaller molecule chains. The catalyst fines are extremely hard and abrasive, and, if not
removed from marine residual fuel, can damage diesel engines with severe economic and, in extreme
cases, safety consequences. The normal way of removing catalyst fines and other contaminants from
marine residual fuel is by centrifugal separation.
It is important that all fuels are centrifuged efficiently to minimize the level of contaminants, including
catalyst fines.
In bunkered oil the maximum content of catalyst fines, expressed as the total content of Aluminium and
Silicon, is 60 mg/kg according to ISO 8217. Engine builders expect the level of catalyst fines to be reduced
to below 10 mg/kg, only reaching to 15 mg/kg for short amounts of time in the fuel entering the engine.
As the level of catalyst fines in the bunkered fuel is lowered, the engine builders expect a related reduction
in the amount of catalyst fines in the fuel entering the engine.
For many years there has been a demand from engine builders, ship builders, ship owners and
classification societies for reliable performance criteria for the centrifuges’ ability to remove abrasive
particles from marine residual fuels. The purpose of this document is to meet this demand by specifying
a repeatable method to determine separation performance with specific test particles in specific test oil.
4
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SIST EN 17763:2022
EN 17763:2022 (E)
1 Scope
This document specifies the procedure for the determination of the certified flow rate (CFR), a
performance parameter for centrifuges, at specific fuel oil viscosities using a defined test oil and a defined
test procedure.
This document is applicable to marine fuel centrifuges.
All values reported as CFR capacities are verified measured values on a defined CFR test bench.
Separation efficiency is determined by a defined particle counting method.
Scaling based on Stoke’s law and disc stack design is excluded from this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
EN ISO 3104, Petroleum products - Transparent and opaque liquids - Determination of kinematic viscosity
and calculation of dynamic viscosity (ISO 3104)
EN ISO 3675, Crude petroleum and liquid petroleum products - Laboratory determination of density -
Hydrometer method (ISO 3675)
EN ISO 3838, Crude petroleum and liquid or solid petroleum products - Determination of density or relative
density - Capillary-stoppered pyknometer and graduated bicapillary pyknometer methods (ISO 3838)
EN 60751, Industrial platinum resistance thermometers and platinum temperature sensors
EN ISO 12185, Crude petroleum and petroleum products - Determination of density - Oscillating U-tube
method (ISO 12185)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
separation efficiency
measure of a centrifuge's capability to remove test specific contaminants
Note 1 to entry: The separation efficiency, η, is calculated as follows:
η = 100 ∙ (1 – C /C ) (1)
out in
where
η is separation efficiency in %;
C is number of the test specific particles in cleaned test oil;
out
C is number of the test specific particles in test oil before centrifuge.
in
5
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SIST EN 17763:2022
EN 17763:2022 (E)
3.2
certified flow rate
CFR
rate of flow under defined conditions
Note 1 to entry: Certified flow rate is determined at a certain time after sludge discharge, at which the separation
efficiency of the centrifuge is 85 %, using a specific test oil and specific test particles under specific test conditions.
The certified flow rate is expressed in l/h.
3.3
density difference
difference of density between particles and oil
Note 1 to entry: Where the difference of density deviates from the nominal values, correction for the deviation shall
be made according to 6.3.
4 Test arrangements
4.1 Test equipment
The test rig shall be arranged according to Figure 1.
The below listed equipment in Figure 1 is subject to the following requirements:
a) system tank/mixing tank (T01) with stirrer shall be of sufficient size for the test run without refilling;
b) reception tank (T02) shall be of sufficient size to match the test run;
c) hot water pump (P01) shall be of centrifugal type;
d) system pump/circulation pump (P3) shall be of adjustable screw pump type;
e) temperature controller (TC1) shall be of PID type;
f) temperature transmitter and sensor (TT1) shall be class B according to EN 60751;
g) temperature transmitter and sensor (TT2) shall be class AA according to EN 60751;
h) temperature transmitter and sensor (TT3) shall be class B according to EN 60751;
i) temperature transmitter and sensor (TT4) shall be class B according to EN 60751;
j) pressure transmitter (PT1) shall have an accuracy of ± 0,1 bar;
k) pressure transmitter (PT2) shall have an accuracy of ± 0,1 bar;
l) flow transmitter (FT1) shall be of screw type and shall have an accuracy of ± 1 % of the measured
flow;
m) oil pipe (B) shall be insulated.
6
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SIST EN 17763:2022
EN 17763:2022 (E)
Key
T01 system tank/mixing tank with stirrer
T02 reception tank
T03 hot water tank
E01 heat exchanger for heating
E02 heat exchanger for cooling
P1 hot water pump
P2 regeneration pump
P3 system pump/circulation pump
C01 centrifuge
SV1 safety relief valve
CV1 control valve
I/P I/P converter
TC1 temperature controller
TT temperature transmitter
7
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SIST EN 17763:2022
EN 17763:2022 (E)
TT1 temperature transmitter and sensor
TT2 temperature transmitter and sensor
TT3 temperature transmitter and sensor
TT4 temperature transmitter and sensor
PT pressure transmitter
PT1 pressure transmitter
PT2 pressure transmitter
FT flow transmitter
FT1 flow transmitter
H heating coil
CW cold water
HV1 regulating valve
HV2 stop valve
HV3 stop valve
HV4 regulating valve
HV5 3-way valve
HV6 regulating valve
HV7 sample valve
HV8 sample valve
A oil pipe
B oil pipe, insulated
Figure 1 — Test rig
4.2 Test media
4.2.1 Test oil specification
The test oil shall be an automotive lube oil of type PAO 6.
NOTE PAO 6 is a polyalphaoleofin oil used as a base for synthetic lubricating oils.
4.2.2 Test oil kinematic viscosity
The kinematic viscosity of the test oil shall be measured according to EN ISO 3104. The kinematic
viscosity shall be expressed as:
A B
10 / T
υ = 10 + C (2)
where
2
υ the kinematic viscosity in mm /s;
T is the temperature in Kelvin (K);
A, B and C are constants related to the actual test oil.
The formula shall be used with three accurately measured values of temperature and corresponding
viscosities for finding A, B and C. The chosen temperatures should for practical reasons be one at each
end of a measuring range of about 20 °C to 60 °C, and one in between. The formula shall then be used
again for determining the two correct temperatures for the desired viscosities (see 5.1) for the tests. The
8
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SIST EN 17763:2022
EN 17763:2022 (E)
viscosity shall be measured after adding the dispersant in 4.2.4. The calibration certificates of both
viscosity and temperature meter shall be added to the final report.
4.2.3 Test oil density
The test oil density shall be measured according to EN ISO 3838 or EN ISO 3675 or EN ISO 12185 at the
two temperatures at which tests are to be made, taking into account appropriate corrections. The choice
of which document to be used shall be based on the equipment used by the laboratory that executes the
test.
4.2.4 Test oil dispersing additive
To achieve the dispersing properties of the test medium, a minimum amount of an appropriate dispersing
additive of borated bis-succinimide type can be added to the PAO 6 type oil base. No more additive than
what is necessary to disperse the particles shall be added (recommended addition is 0,3 % by weight).
The density and the viscosity of the test medium in tank T01, see Figure 1, shall be measured after the
dispersing additive has been added.
4.2.5 Test particle specification
To simulate catalytic fines and other fuel contaminants, monodispersed plastic 5 µm particles (spheres)
with a composition of 45 % polystyrene and 55 % divinylbenzene shall be used. The density of the
3
spheres shall be (1 050 ± 10,5) kg/m . The size variation shall not be more than ± 2,5 %, equal
to ± 0,125 µm. The actual density and size of the particles shall be measured. If the size deviates from the
nomi
...
SLOVENSKI STANDARD
oSIST prEN 17763:2021
01-december-2021
Centrifuge - Centrifuge za ladijska goriva - Določanje učinkovitosti ločevanja
delcev in certificirane stopnje pretoka (CFR) pod določenimi preskusnimi pogoji
Centrifuges - Marine fuel centrifuges - Determination of particle separation performance
and certified flow rate (CFR) under defined test conditions
Zentrifugen - Zentrifugen für Schiffskraftstoffe - Bestimmung der
Partikelabscheideleistung und der zertifizierten Durchflussrate (CFR) unter definierten
Testbedingungen
Centrifugeuses - Centrifugeuses à combustible pour la marine - Détermination des
performances de séparation des particules et du débit certifié (CFR) dans des conditions
d'essai définies
Ta slovenski standard je istoveten z: prEN 17763
ICS:
47.020.20 Ladijski motorji Marine engines and
propulsion systems
oSIST prEN 17763:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 17763:2021
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oSIST prEN 17763:2021
DRAFT
EUROPEAN STANDARD
prEN 17763
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2021
ICS 47.020.20
English Version
Centrifuges - Marine fuel centrifuges - Determination of
particle separation performance and certified flow rate
(CFR) under defined test conditions
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 313.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
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.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17763:2021 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 17763:2021
prEN 17763:2021 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Test arrangements . 6
4.1 Test equipment . 6
4.2 Test media . 8
4.2.1 Test oil specification . 8
4.2.2 Test oil kinematic viscosity . 8
4.2.3 Test oil density . 9
4.2.4 Test oil dispersing additive . 9
4.2.5 Test particle specification . 9
5 Performance test . 9
5.1 Oil viscosity . 9
5.2 Particle concentration . 9
5.3 Dispersing of particles into test medium . 9
5.4 Test sequence . 10
5.5 Test procedure . 10
5.6 Sampling . 11
5.7 Particle counting . 11
6 Analysis . 12
6.1 Calculation of separation efficiency . 12
6.2 Calculation of Certified Flow Rate (CFR) . 12
6.3 Correction of measured capacities . 12
7 CFR results for similar machines (scaling) . 12
8 Test report . 12
Annex A (informative) Dispersing the particles in the test medium . 14
Annex B (informative) Regeneration of test particle concentration . 15
Annex C (normative) Particle counting . 16
Annex D (informative) Example of correction of measured capacities . 27
Bibliography . 28
2
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oSIST prEN 17763:2021
prEN 17763:2021 (E)
European foreword
This document (prEN 17763:2021) has been prepared by Technical Committee
CEN/TC 313 “Centrifuges”, the secretariat of which is held by SIS.
This document is currently submitted to the CEN Enquiry.
3
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oSIST prEN 17763:2021
prEN 17763:2021 (E)
Introduction
In general, diesel engines for propulsion of ships burn marine residual fuels. Marine residual fuels contain
the residue remaining after lighter fractions have been extracted from the crude oil during various
processes in the oil refinery. They are a blend of this heavy fraction to which other refinery stream
products are added to obtain the desired viscosity grade. Marine residual fuel oils contain elements
inherent to the product itself but they also contain some contaminants, which either are due to an
external contamination or enter into the fuel at the refinery during production, such as catalyst fines
which are small fragments of a catalyst, used in the catalytic cracking stage in order to cut long molecule
chains into smaller molecule chains. The catalyst fines are extremely hard and abrasive, and, if not
removed from marine residual fuel, can damage diesel engines with severe economic and, in extreme
cases, safety consequences. The normal way of removing catalyst fines and other contaminants from
marine residual fuel is by centrifugal separation.
It is important that all fuels are centrifuged efficiently to minimize the level of contaminants, including
catalyst fines.
In bunkered oil the maximum content of catalyst fines, expressed as the total content of Aluminium and
Silicon, is 60 mg/kg according to ISO 8217. Engine builders expect the level of catalyst fines to be reduced
to below 10 mg/kg, only reaching to 15 mg/kg for short amounts of time in the fuel entering the engine.
As the level of catalyst fines in the bunkered fuel is lowered, the engine builders expect a related reduction
in the amount of catalyst fines in the fuel entering the engine.
For many years now there has been a demand from engine builders, ship builders, ship owners and
classification societies for reliable performance criteria for the centrifuges’ ability to remove abrasive
particles from marine residual fuels. The purpose of this document is to meet this demand by specifying
a repeatable method to determine separation performance with specific test particles in specific test oil.
4
---------------------- Page: 6 ----------------------
oSIST prEN 17763:2021
prEN 17763:2021 (E)
1 Scope
This document specifies the procedure for the determination of the certified flow rate (CFR), a
performance parameter for centrifuges, at specific fuel oil viscosities using a defined test oil and a defined
test procedure.
This document is applicable to marine fuel centrifuges.
All values reported as CFR capacities are verified measured values on a defined CFR test bench.
Scaling based on Stoke’s law and disc stack design is excluded from this document.
Separation efficiency is determined by a defined particle counting method.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
EN ISO 3104, Petroleum products - Transparent and opaque liquids - Determination of kinematic viscosity
and calculation of dynamic viscosity (ISO 3104)
EN ISO 3675, Crude petroleum and liquid petroleum products - Laboratory determination of density -
Hydrometer method (ISO 3675)
EN ISO 3838, Crude petroleum and liquid or solid petroleum products - Determination of density or relative
density - Capillary-stoppered pyknometer and graduated bicapillary pyknometer methods (ISO 3838)
EN ISO 12185, Crude petroleum and petroleum products - Determination of density - Oscillating U-tube
method (ISO 12185)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
separation efficiency
measure of a centrifuge's capability to remove test specific contaminants
Note 1 to entry: The separation efficiency, η, is calculated as follows:
η = 100 ∙ (1 – C /C ) (1)
out in
where
η is separation efficiency in %;
C is number of the test specific particles in cleaned test oil;
out
C is number of the test specific particles in test oil before centrifuge.
in
5
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oSIST prEN 17763:2021
prEN 17763:2021 (E)
3.2
certified flow rate
CFR
rate of flow under defined conditions
Note 1 to entry: Certified Flow Rate is determined at a certain time after sludge discharge, at which the separation
efficiency of the centrifuge is 85 %, using a specific test oil and specific test particles under specific test conditions.
The Certified Flow Rate is expressed in l/h.
3.3
density difference
difference of density between particles and oil
Note 1 to entry: Where the difference of density deviates from the nominal values correction for the deviation shall
be made as described in 6.3.
4 Test arrangements
4.1 Test equipment
General arrangement of the test equipment is shown in Figure 1.
6
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oSIST prEN 17763:2021
prEN 17763:2021 (E)
Key
T01 system tank or mixing tank (sufficient size for test run without refilling) with stirrer
T02 reception tank (sufficient size to match T01)
T03 hot water tank
E01 heat exchanger (used for heating)
E02 heat exchanger (used for cooling)
P1 hot water pump (centrifugal type)
P2 regeneration pump
P3 system pump or circulation pump (adjustable screw pump)
C01 centrifuge
SV1 safety relief valve
CV1 control valve
I/P I/P converter
TC1 temperature controller (PID type)
7
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oSIST prEN 17763:2021
prEN 17763:2021 (E)
TT temperature transmitter
TT1 temperature transmitter and sensor (combined accuracy ±0,1 °C)
TT2 temperature transmitter and sensor (combined accuracy ±0,1 °C)
TT3 temperature transmitter and sensor (combined accuracy ±0,1 °C)
PT pressure transmitter
PT1 pressure transmitter (accuracy ±0,1 bar)
PT2 pressure transmitter (accuracy ±0,1 bar)
FT flow meter
FT1 flow meter (screw type) (accuracy ±1 %)
H heating coil
CW cold water
HV1 regulating valve
HV2 stop valve
HV3 stop valve
HV4 regulating valve
HV5 3-way valve
HV6 regulating valve
HV7 sample valve
HV8 sample valve (always open during test)
A oil pipe
B oil pipe, insulated
C water pipe
Figure 1 — Test rig
4.2 Test media
4.2.1 Test oil specification
The test oil shall be an automotive lube oil of type PAO 6.
NOTE PAO 6 is a polyalphaoleofin oil used as a base for synthetic lubricating oils.
4.2.2 Test oil kinematic viscosity
The kinematic viscosity of the test oil shall be measured according to EN ISO 3104. The kinematic
viscosity shall be expressed as:
A
10 / T
υ = 10 + C (2)
where
2
υ the kinematic viscosity in mm /s;
T is the temperature in Kelvin (K);
A, B and C are constants related to the actual test oil.
The formula shall be used with three accurately measured values of temperature and corresponding
viscosities for finding A, B and C. The chosen temperatures should for practical reasons be one at each
end of a measuring range of about 20 °C to 60 °C, and one in between. The formula shall then be used
again for determining the two correct temperatures for the desired viscosities (see 5.1) for the tests. The
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oSIST prEN 17763:2021
prEN 17763:2021 (E)
viscosity shall be measured after adding the dispersant in 4.2.4. The calibration certificates of both
viscosity and temperature meter shall be added to the final report.
4.2.3 Test oil density
The test oil density shall be measured according to EN ISO 3838 or EN ISO 3675 or EN ISO 12185 at the
two temperatures at which tests are to be made, taking into account appropriate corrections. The choice
of which document to be used shall be based on the equipment used by the laboratory that executes the
test.
4.2.4 Test oil dispersing additive
To achieve the dispersing properties of the test medium, a minimum amount of an appropriate dispersing
additive of borated bis-succinimide type can be added to the PAO 6 type oil base. No more additive than
what is necessary to disperse the particles shall be added (suggested addition is 0,3 % by weight). The
density and the viscosity of the test medium in tank T01, see Figure 1, shall be measured after the
dispersing additive has been added.
4.2.5 Test particle specification
To simulate catalytic fines and other fuel contaminants, monodispersed plastic 5 µm particles (spheres)
with a composition of 45 % polystyrene and 55 % divinylbenzene shall be used. The density of the
3
spheres shall be (1 050 ± 10,5) kg/cm . The size variation shall not be more than ± 2,5 %, equal
to ± 0,125 µm. The actual density and size of the particles shall be measured. If the size deviates from the
nominal 5,00 µm but is within the accepted limit 5,00 µm ± 0,125 µm, a correction for the deviation shall
be made as described in 6.3.
5 Performance test
5.1 Oil viscosity
2 3
To simulate a typical heavy fuel of 380 mm /s at 50 °C and a maximum density of 1 010 kg/m , the test
2 2
oil shall be heated to the temperature corresponding to a viscosity of 35 mm /s ± 1,4 mm /s according
to the method described in 4.2.2. Where the viscosity during tests deviates from the nominal value of
2 2 2
35 mm /s but is within the accepted limit 35 mm /s ± 1,4 mm /s, correction shall be made as described
in 6.3.
2 3
To simulate a typical heavy fuel of 700 mm /s at 50 °C and a maximum density of 1 010 kg/m , the test
2 2
oil shall be heated to the temperature corresponding to a viscosity of 55 mm /s ± 2,2 mm /s according
to the method described
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