SIST EN ISO 18335:2024

Petroleum products and related products - Determination of kinematic viscosity by calculation from the measured dynamic viscosity and density - Method by constant pressure viscometer (ISO 18335:2024)

This document specifies a procedure for determining dynamic viscosity, η, and density, ρ, for the calculation of kinematic viscosity, ν, of middle distillate fuels, fatty acid methyl ester fuels (FAME) and mixtures thereof, up to 60 % with middle distillate fuels, and lubricating oils (e.g. base oils, formulated oils), and synthetics, using a constant pressure viscometer. The range of kinematic viscosities covered in this test method is from 0,5 mm2/s to 2 000 mm2/s, with precision at 40 °C from 1,0 mm2/s to 1 286 mm2/s, and precision at 100 °C from 3,0 mm2/s to 157 mm2/s.
The result obtained using the procedure described in this document depends on the rheological behaviour of the sample. This document is predominantly applicable to liquids whose shear stress and shear rate are proportional (Newtonian flow behaviour). However, if the viscosity changes significantly with the shear rate, comparison with other measuring methods is only permissible at similar shear rates.

Mineralölerzeugnisse und verwandte Produkte - Bestimmung der dynamischen Viskosität und Berechnung der kinematischen Viskosität - Verfahren mit konstantem Druck Viskosimeter (ISO 18335:2024)

Dieses Dokument legt ein Verfahren zur Bestimmung der dynamischen Viskosität, η, und der Dichte, ρ, zur Berechnung der kinematischen Viskosität, ν, von Mitteldestillat-Kraftstoffen, Fettsäure-Methylester-Kraftstoffen (FAME, en: fatty acid methyl ester) und deren Gemischen mit bis zu 60 % Mitteldestillat-Kraftstoffen, und Schmierölen (z. B. Grundölen, Fertigölen) und synthetischen Ölen, unter Anwendung eines Konstantdruck-Viskosimeters fest. Der Bereich kinematischer Viskositäten, die von diesem Prüfverfahren abgedeckt werden, reicht von 0,5 mm2/s bis 2 000 mm2/s; die Präzision wurde dabei bei 40 °C für den Bereich von 1,0 mm2/s bis 1 286 mm2/s und bei 100 °C für den Bereich von 3,0 mm2/s bis 157 mm2/s ermittelt.
Das Ergebnis, das bei Anwendung des in diesem Dokument beschriebenen Verfahrens erhalten wird, hängt vom rheologischen Verhalten der Probe ab. Dieses Dokument ist vorwiegend für Flüssigkeiten anwendbar, deren Scherspannung und Schergeschwindigkeit proportional sind (Newtonsches Fließverhalten). Wenn sich die Viskosität jedoch mit der Schergeschwindigkeit wesentlich ändert, ist ein Vergleich mit anderen Messverfahren nur bei ähnlichen Schergeschwindigkeiten zulässig.

Produits pétroliers et produits connexes - Détermination de la viscosité cinématique par calcul à partir des mesures de viscosité dynamique et de masse volumique - Méthode par viscosimètre à pression constante (ISO 18335:2024)

Le présent document spécifie une procédure de détermination de la viscosité dynamique, η, et de la masse volumique, ρ, pour le calcul de la viscosité cinématique, ν, des distillats moyens, des esters méthyliques d'acides gras (EMAG) et de leurs mélanges, jusqu'à 60 % avec des distillats moyens, ainsi que des huiles lubrifiantes (par exemple huiles de base, huiles formulées) et les huiles synthétiques, à l'aide d'un viscosimètre à pression constante. La plage de viscosités cinématiques couverte par la présente méthode d'essai s’étend de 0,5 mm2/s à 2 000 mm2/s, avec une fidélité à 40 °C de 1,0 mm2/s à 1 286 mm2/s, et une fidélité à 100 °C de 3,0 mm2/s à 157 mm2/s.
Le résultat obtenu à l'aide de la procédure décrite dans le présent document dépend du comportement rhéologique de l'échantillon. Ce document s'applique principalement aux liquides dont la contrainte de cisaillement et le taux de cisaillement sont proportionnels (comportement d'écoulement newtonien). Toutefois, si la viscosité varie considérablement en fonction du taux de cisaillement, la comparaison avec d'autres méthodes de mesure n'est possible qu'à des taux de cisaillement similaires.

Naftni in sorodni proizvodi - Določanje kinematične viskoznosti z izračunom iz izmerjene dinamične viskoznosti in gostote - Metoda z viskozimetrom pri konstantnem tlaku (ISO 18335:2024)

Ta dokument določa postopek za določanje kinematične viskoznosti, η, in gostote, ρ, za izračunavanje kinematične viskoznosti, v, srednje destilatnih goriv, metilnih estrov maščobnih kislin (FAME) in njihovih mešanic z do 60-odstotno vsebnostjo srednje destilatnih goriv in mazivnih olj (npr. baznih olj, formuliranih olj) in sintetike z uporabo viskozimetra s stalnim tlakom. Območje kinematične viskoznosti, zajeto v tej preskusni metodi, je od 0,5 mm2/s do 2000 mm2/s z natančnostjo pri 40 °C od 1,0 mm2/s do 1286 mm2/s in natančnostjo pri 100 °C od 3,0 mm2/s do 157 mm2/s.
Rezultati, pridobljeni s tem postopkom in opisani v tem dokumentu, so odvisni od reoloških lastnosti vzorca. Ta dokument se predvsem uporablja za tekočine, katerih strižna napetost in strižna hitrost sta sorazmerni (lastnosti newtonskega toka). Če pa se viskoznost bistveno spremeni s strižno hitrostjo, je primerjava z drugimi merilnimi metodami dovoljena samo pri podobni strižni hitrosti.

General Information

• Status: Published
• Public Enquiry End Date: 01-Aug-2023
• Publication Date: 25-Feb-2024
• ICS: 75.080 - Petroleum products in general
• Technical Committee: NAD - Petroleum products, lubricants and related products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 15-Feb-2024
• Due Date: 21-Apr-2024
• Completion Date: 26-Feb-2024
• Ref Project: EN ISO 18335:2024 - Petroleum products and related products - Determination of kinematic viscosity by calculation from the measured dynamic viscosity and density - Method by constant pressure viscometer (ISO 18335:2024)

Overview

EN ISO 18335:2024 (CEN adoption of ISO 18335:2024) specifies a standardized laboratory procedure to determine kinematic viscosity (ν) of petroleum products and related liquids by calculating it from measured dynamic viscosity (η) and density (ρ) using a constant pressure viscometer. The method is applicable to middle distillate fuels, fatty acid methyl ester fuels (FAME) and FAME/middle-distillate blends (up to 60 % FAME), lubricating oils (base and formulated oils) and synthetic lubricants.

Key measurement capabilities:

• Kinematic viscosity range: 0.5 mm2/s to 2 000 mm2/s
• Precision at 40 °C: applicable from 1.0 mm2/s to 1 286 mm2/s
• Precision at 100 °C: applicable from 3.0 mm2/s to 157 mm2/s

Key topics and requirements

• Measurement principle: a temperature-controlled horizontal capillary with optical sensors forces a fixed volume of sample through under constant pressure while an oscillating U-tube densitometer determines density. Dynamic viscosity is derived from flow time; kinematic viscosity is calculated as η / ρ.
• Rheological considerations: primarily intended for Newtonian fluids (shear stress proportional to shear rate). If viscosity varies with shear rate (non-Newtonian behavior), results must be compared only at similar shear rates or with comparable methods.
• Sample handling: specifies sampling and preparation procedures to ensure representative test portions (references include ISO 3170 and ISO 3171 for sampling guidance).
• Apparatus and calibration: includes requirements for viscometer setup, temperature control, densitometer calibration, verification procedures and instrument preparation.
• Precision and reporting: defines repeatability and reproducibility limits and mandatory test report content.

Practical applications

• Quality control and acceptance testing in refineries, fuel terminals and lubricant manufacturing.
• Verification of product specifications for middle distillates, FAME blends, engine fuels and lubricating oils.
• Laboratory testing for R&D, formulation, blending verification and regulatory compliance.
• Instrument manufacturers and calibration laboratories can use the standard to validate constant pressure viscometer performance.

Who should use this standard

• Laboratory analysts and QC/QA personnel in petroleum and lubricant industries
• Test laboratories accredited for viscosity measurement
• Instrument manufacturers and service/calibration providers
• Standards bodies and regulatory agencies specifying acceptable test methods

Related standards

• ISO 3170 - Petroleum liquids - Manual sampling
• ISO 3171 - Petroleum liquids - Automatic pipeline sampling

Keywords: EN ISO 18335:2024, kinematic viscosity, dynamic viscosity, density, constant pressure viscometer, petroleum products, FAME, middle distillate fuels, lubricating oils, viscosity measurement.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2024
Naftni in sorodni proizvodi - Določanje kinematične viskoznosti z izračunom iz
izmerjene dinamične viskoznosti in gostote - Metoda z viskozimetrom pri
konstantnem tlaku (ISO 18335:2024)
Petroleum products and related products - Determination of kinematic viscosity by
calculation from the measured dynamic viscosity and density - Method by constant
pressure viscometer (ISO 18335:2024)
Mineralölerzeugnisse und verwandte Produkte - Bestimmung der dynamischen
Viskosität und Berechnung der kinematischen Viskosität - Verfahren mit konstantem
Druck Viskosimeter (ISO 18335:2024)
Produits pétroliers et produits connexes - Détermination de la viscosité cinématique par
calcul à partir des mesures de viscosité dynamique et de masse volumique - Méthode
par viscosimètre à pression constante (ISO 18335:2024)
Ta slovenski standard je istoveten z: EN ISO 18335:2024
ICS:
75.080 Naftni proizvodi na splošno Petroleum products in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 18335
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2024
EUROPÄISCHE NORM
ICS 75.080
English Version
Petroleum products and related products - Determination
of kinematic viscosity by calculation from the measured
dynamic viscosity and density - Method by constant
pressure viscometer (ISO 18335:2024)
Produits pétroliers et produits connexes - Mineralölerzeugnisse und verwandte Produkte -
Détermination de la viscosité cinématique par calcul à Bestimmung der dynamischen Viskosität und
partir des mesures de viscosité dynamique et de masse Berechnung der kinematischen Viskosität - Verfahren
volumique - Méthode par viscosimètre à pression mit konstantem Druck Viskosimeter (ISO 18335:2024)
constante (ISO 18335:2024)
This European Standard was approved by CEN on 4 February 2024.

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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18335:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 18335:2024) has been prepared by Technical Committee ISO/TC 28 "Petroleum
and related products, fuels and lubricants from natural or synthetic sources" in collaboration with
Technical Committee CEN/TC 19 “Gaseous and liquid fuels, lubricants and related products of
petroleum, synthetic and biological origin” the secretariat of which is held by NEN.
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 August 2024, and conflicting national standards shall
be withdrawn at the latest by August 2024.
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/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations 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.
Endorsement notice
The text of ISO 18335:2024 has been approved by CEN as EN ISO 18335:2024 without any modification.

International
Standard
ISO 18335
First edition
Petroleum products and related
2024-01
products — Determination of
kinematic viscosity by calculation
from the measured dynamic
viscosity and density – Method by
constant pressure viscometer
Produits pétroliers et produits connexes — Détermination de la
viscosité cinématique par calcul à partir des mesures de viscosité
dynamique et de masse volumique — Méthode par viscosimètre à
pression constante
Reference number
ISO 18335:2024(en) © ISO 2024
ISO 18335:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 18335:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents and materials . 2
6 Apparatus . 3
7 Test portion preparation . 3
7.1 Sampling .3
7.2 Sample preparation .3
8 Calibration and verification . . 4
9 Apparatus preparation . 4
10 Procedure . 4
11 Calculation . 4
12 Expression of results . 4
13 Precision . 5
13.1 General .5
13.2 Repeatability, r.5
13.3 Reproducibility, R .5
14 Test report . 5
Bibliography . 6

iii
ISO 18335:2024(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
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the
...