ISO/TS 23877-1:2023

© ISO 2021 – All rights reserved
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ISO/TC 28
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Date: 2021-122023-04-18
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ISO/DTSTS 23877--1:20212023(E)
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Petroleum and related products from natural or synthetic sources — Determination
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of pour point — Part 1: Automated step-wise cooling method
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Produits pétroliers et dérivés —connexes d'origine naturelle ou synthétique - Détermination du point
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d'écoulement — Partie 1: Méthode automatisée par refroidissement par paliers
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ISO/DTS 23877-1:2021(E)

© ISO 2023
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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’sISO's member body in the country of the requester.
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ISO/DTS TS 23877-1:20222023(E)
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© ISO 2021 2023 – All rights reserved iiiiii

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ISO/TS 23877-1:2023(E)
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Contents          Page
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pt, Left
Foreword . 6
Introduction . 8
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents and Materials . 2
6 Apparatus . 2
7 Sampling . 4
8 Preparation of apparatus . 4
9 Calibration . 4
10 Verification of the performance of the apparatus. 5
11 Procedure. 5
12 Expression of results . 6
13 Precision . 6
14 Test report . 7
Annex A (normative) Detection principles . 8
Bibliography . 13
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 . 2
Figure 1 — Apparatus for pour point test . 4
7 Sampling . 4
8 Preparation of apparatus . 4
9 Calibration . 4
10 Verification of the performance of the apparatus. 5
11 Procedure. 5
Table 1 — Bath and sample temperature ranges . 6
12 Expression of results . 6
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13 Precision . 6
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iv © ISO 2023 – All rights reserved

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ISO/DTS TS 23877-1:20222023(E)
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14 Test report . 7
Annex A (normative) Detection principles . 8
A.1 Optics (optical reflection) . 8
Figure A.1 — Detection using optics (optical reflection) . 8
A.2 Charged-coupled device (CCD) camera . 8
Figure A.2 — Detection using a CCD Camera . 9
A.3 Temperature change (thermal sense) . 10
Figure A.3 — Detection using temperature change . 11
A.4 Ultrasonics (sensor) . 11
Figure A.4 — Detection using an ultrasonic sensor . 12
Bibliography . 13
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© ISO 2021 2023 – All rights reserved vv

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ISO/TS 23877-1:2023(E)
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards Formatted: Adjust space between Latin and Asian text,
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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 documentsdocument should be noted. This document was drafted in accordance with
Field Code Changed
the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawnISO draws attention to the possibility that some of the elementsimplementation of this
document may beinvolve the subjectuse 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. Details of any patent rights identified during the development of
the document will be in the Introduction and/or on the ISO list of patent declarations received (see
www.iso.org/patents).
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 voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT)), see
www.iso.org/iso/foreword.html. Formatted: English (United States)
This document was prepared by Technical Committee ISO/TC 28, Petroleum and related products, fuels and
lubricants from natural or synthetic sources.
A list of all parts in the ISO 23877 series can be found on the ISO website. Formatted: std_publisher
Formatted: std_docNumber
Any feedback or questions on this document should be directed to the user’s national standards body. A
Formatted: std_docPartNumber
complete listing of these bodies can be found at www.iso.org/members.html.
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vi © ISO 2023 – All rights reserved

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ISO/DTS TS 23877-1:20222023(E)
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© ISO 2021 2023 – All rights reserved viivii

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ISO/TS 23877-1:2023(E)
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Introduction
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This document describes the determination of pour point by automated instruments that mimic the Formatted: Body Text, Don't adjust space between Latin
and Asian text, Don't adjust space between Asian text and

manualmirrors ISO 3016 [1] ((which comprises a manual procedure only). This document is based on the
numbers
techniques used in the instruments available on the market in 2021.
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This test method doesn'tdoes not contain any precision at this stage. As this is a newly described technique,
also no immediate precision or interim repeatability can be given. AnAt the time of publication, an
interlaboratory study is on-going at the moment of publication of this document. Theongoing, the results
thereofof which will be assessed by ISO/TC 28/WG 27 before this document can be revisedtaken into a full
International Standardaccount in future standardization activities.

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viii © ISO 2023 – All rights reserved

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DRAFT TECHNICAL SPECIFICATION ISO/DTS TS 23877-1:20212023(E)
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Formatted Table

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Petroleum and related products from natural or synthetic
sources — Determination of pour point — Part 1: Automated step -
wise cooling method
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WARNING — The use of this document can involve hazardous materials, operations and equipment. This
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document does not purport to address all of the safety problems associated with its use. It is the
responsibility of the users of this document to take appropriate measures to ensure the safety and health Formatted: Font color: Auto
of personnel prior to the application of this document, and to determine the applicability of any other
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restrictions.
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1 Scope
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This document specifies a method for the determination ofdetermining the pour point of petroleum
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products by means of automated equipment for detecting, in which movement of the test specimen is
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detected using a step-wise cooling technique.
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A separate procedure suitable for the determination of the lower pour point of fuel oils, heavy lubricant
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base stock, and products containing residual fuel components is also described.
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Left + 138.9 pt, Left + 158.75 pt, Left + 178.6 pt, Left +
The procedure described in this document is not suitable for crude oils.
198.45 pt, Left
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Test results from this method are determined in 3 °C testing intervals.
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NOTE Some equipment can also generatesgenerate results at 1 °C testing intervals, which is an acceptable
text, Don't adjust space between Asian text and numbers
alternative procedure, but for which precision and bias have not been determined.
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2 Normative references
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The following documents are referred to in the text in such a way that some or all of their content
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constitutes requirements of this document. For dated references, only the edition cited applies. For undated
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references, the latest edition of the referenced document (including any amendments) applies.
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States)
ISO 3170, Petroleum liquids — Manual sampling
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ISO 3171, Petroleum liquids — Automatic pipeline sampling
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ISO 17034, General requirements for the competence of reference material producers
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3 Terms and definitions
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For the purposes of this document, the following terms and definitions apply.
...
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ISO and IEC maintain terminologicalterminology databases for use in standardization at the following
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addresses:
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— ISO Online browsing platform: available at https://www.iso.org/obp
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— IEC Electropedia: available at https://www.electropedia.org/
...
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ISO/TS 23877-1:2023(E)
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3.1
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pour point
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lowest temperature at which a sample of petroleum product will continue to flow when it is cooled under
spacing: At least 11.5 pt
specified standard conditions
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3.2
Asian text and numbers
no -flow point
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temperature of the test specimen at which a wax crystal structure or viscosity increase, or both,
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impedesimpeding movement of the surface of the test specimen under specified standard conditions
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Asian text and numbers
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4 Principle between Latin and Asian text, Don't adjust space between
Asian text and numbers, Tab stops: 19.85 pt, Left + 39.7
pt, Left + 59.55 pt, Left + 79.4 pt, Left + 99.25 pt, Left +
After preliminary heating, the sample is cooled at a specified rate and examined at intervals of 3 °C for flow
119.05 pt, Left + 138.9 pt, Left + 158.75 pt, Left + 178.6
characteristics. The lowest temperature at which movement ('pour'("pour" or 'flow')"flow") of the sample
pt, Left + 198.45 pt, Left
is detected, by the automated equipment, is recorded as the pour point.
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5 Reagents and materials
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5.1 Certified reference materials (CRM), from suppliers according toin accordance with ISO 17034 [2]. between Latin and Asian text, Don't adjust space between
Asian text and numbers
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6 Apparatus
Left + 119.05 pt, Left + 138.9 pt, Left + 158.75 pt, Left +
178.6 pt, Left + 198.45 pt, Left
6.1 Test jar, cylindrical, of clear glass, flat-bottomed, 33,2 mm to 34,8 mm outside diameter and 110 mm
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to 125 mm in height. The test jar shall have an inside diameter of 30,0 mm to 32,4 mm, with the constraint
pt, Left
that the wall thickness be no greater than 1,6 mm.
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The jar shall be marked with a line to indicate a contents level, corresponding to a volume of 45 ml ± 1 ml.
178.6 pt, Left + 198.45 pt, Left
6.2 Sample temperature probe, cylindrical, vertical in the test jar and plunged in the sample, depth and
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location specified by the manufacturer of the testing device (see also [3] and [4]).
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A thermometer with digital display (e.g. PT100) shall be used for measuring the sample temperature with
pt, Left
a resolution of at least 0,1 °C and an accuracy of at least 0,5 °C (see Figure 1).
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NOTE The exact location of the probe depends on the equipment design manufacturer.
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6.3 Anti-moisture device, to close the test jar and bath, avoidingpreventing the introduction of any Latin and Asian text, Don't adjust space between Asian text
and numbers, Tab stops: 19.85 pt, Left + 39.7 pt, Left +
moisture to be introduced.
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Left + 138.9 pt, Left + 158.75 pt, Left + 178.6 pt, Left +
6.4 Jacket (test jar container), watertight, cylindrical metal, flat-bottomed, dimensions as per the
198.45 pt, Left
manufacturer of the testing device. It shall be supported in a vertical position in the cooling device (6.7),
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and shall be capable of being cleaned.
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6.5 Disc (optional, depending on the design of the equipment), made of any insulating material (for
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example cork or felt) approximately 6 mm in thickness, to fit loosely inside the jacket to maintain the test
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jar and avoid any direct contact with the jacket.
...
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6.6 Gasket (optional, depending on the design of the equipment), ring form, approximately 5 mm in
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thickness, to fit snugly on the outside of the test jar and loosely inside the jacket.
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ISO/TS 23877-1:2023(E)
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This gasket shallcan be made of rubber, leather or other suitable material, elastic enough to cling to the test Formatted: Body Text, Indent: Left: 0 pt, Adjust space
between Latin and Asian text, Adjust space between Asian
jar and hard enough to hold its shape. The purpose of the gasket is to prevent the test jar from touching the
text and numbers
jacket. It may be made of rubber, leather or other suitable material.
6.7 Cooling/heating device, cooling bath or device with a firm support to hold the jacket vertical, capable Formatted: Tab stops: 19.85 pt, Left + 28.1 pt, Left +
39.7 pt, Left + 59.55 pt, Left + 79.4 pt, Left + 99.25 pt,
of maintaining the temperature of the jacket as required in Table 1.
Left + 119.05 pt, Left + 138.9 pt, Left + 158.75 pt, Left +
178.6 pt, Left + 198.45 pt, Left + Not at 14.2 pt
6.8 Automated detection device, detection system able to detect movement of the sample by means of
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optics (optical reflection), CCD (charged-coupled device (CCD) camera, temperature change (thermal
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sense) or ultrasonics (sensor), as specified in Annex A.
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6.9 Timing device, capable of measuring up to 30 s with an accuracy of 0,2 s. Formatted: Font: Not Bold
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Dimensions in millimetres
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pt
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ISO/TS 23877-1:2023(E)
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198.45 pt, Left + Not at 14.2 pt
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198.45 pt, Left
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59.55 pt, Left + 79.4 pt, Left + 99.25 pt, Left + 119.05 pt,
Left + 138.9 pt, Left + 1
...

TECHNICAL ISO/TS
SPECIFICATION 23877-1
First edition
Petroleum and related products
from natural or synthetic sources —
Determination of pour point —
Part 1:
Automated step-wise cooling method
Produits pétroliers et connexes d'origine naturelle ou synthétique -
Détermination du point d'écoulement —
Partie 1: Méthode automatisée par refroidissement par paliers
PROOF/ÉPREUVE
Reference number
ISO/TS 23877-1:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO/TS 23877-1:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
PROOF/ÉPREUVE © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/TS 23877-1:2023(E)
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 . 2
7 Sampling . 3
8 Preparation of apparatus .3
9 Calibration .4
10 Verification of the performance of the apparatus . 4
11 Procedure . 4
12 Expression of results .5
13 Precision . 6
14 Test report . 6
Annex A (normative) Detection principles . 7
Bibliography .10
iii
© ISO 2023 – All rights reserved PROOF/ÉPREUVE

---------------------- Page: 3 ----------------------
ISO/TS 23877-1:2023(E)
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 voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 28, Petroleum and related products, fuels
and lubricants from natural or synthetic sources.
A list of all parts in the ISO 23877 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.html.
iv
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ISO/TS 23877-1:2023(E)
Introduction
This document describes the determination of pour point by automated instruments that mirrors
ISO 3016 (which comprises a manual procedure only). This document is based on the techniques used
in the instruments available on the market in 2021.
This test method does not contain any precision at this stage. As this is a newly described technique,
also no immediate precision or interim repeatability can be given. At the time of publication, an
interlaboratory study is ongoing, the results of which will be taken into account in future standardization
activities.
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TECHNICAL SPECIFICATION ISO/TS 23877-1:2023(E)
Petroleum and related products from natural or synthetic
sources — Determination of pour point —
Part 1:
Automated step-wise cooling method
WARNING — The use of this document can involve hazardous materials, operations and
equipment. This document does not purport to address all of the safety problems associated
with its use. It is the responsibility of the users of this document to take appropriate measures
to ensure the safety and health of personnel prior to the application of this document, and to
determine the applicability of any other restrictions.
1 Scope
This document specifies a method for determining the pour point of petroleum products by means of
automated equipment, in which movement of the test specimen is detected using a step-wise cooling
technique.
A separate procedure suitable for the determination of the lower pour point of fuel oils, heavy lubricant
base stock, and products containing residual fuel components is also described.
The procedure described in this document is not suitable for crude oils.
Test results from this method are determined in 3 °C testing intervals.
NOTE Some equipment can also generate results at 1 °C testing intervals, which is an acceptable alternative
procedure, but for which precision and bias have not been determined.
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.
ISO 3170, Petroleum liquids — Manual sampling
ISO 3171, Petroleum liquids — Automatic pipeline sampling
ISO 17034, General requirements for the competence of reference material producers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
pour point
lowest temperature at which a sample of petroleum product will continue to flow when it is cooled
under specified standard conditions
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ISO/TS 23877-1:2023(E)
3.2
no-flow point
temperature of the test specimen at which a wax crystal structure or viscosity increase, or both,
impeding movement of the surface of the test specimen under specified standard conditions
4 Principle
After preliminary heating, the sample is cooled at a specified rate and examined at intervals of 3 °C for
flow characteristics. The lowest temperature at which movement ("pour" or "flow") of the sample is
detected, by the automated equipment, is recorded as the pour point.
5 Reagents and materials
5.1 Certified reference materials (CRM), from suppliers in accordance with ISO 17034.
6 Apparatus
6.1 Test jar, cylindrical, of clear glass, flat-bottomed, 33,2 mm to 34,8 mm outside diameter and
110 mm to 125 mm in height. The test jar shall have an inside diameter of 30,0 mm to 32,4 mm, with the
constraint that the wall thickness be no greater than 1,6 mm.
The jar shall be marked with a line to indicate a contents level, corresponding to a volume of 45 ml ± 1 ml.
6.2 Sample temperature probe, cylindrical, vertical in the test jar and plunged in the sample, depth
and location specified by the manufacturer of the testing device (see also [3] and [4]).
A thermometer with digital display (e.g. PT100) shall be used for measuring the sample temperature
with a resolution of at least 0,1 °C and an accuracy of at least 0,5 °C (see Figure 1).
NOTE The exact location of the probe depends on the equipment design manufacturer.
6.3 Anti-moisture device, to close the test jar and bath, preventing the introduction of any moisture.
6.4 Jacket (test jar container), watertight, cylindrical metal, flat-bottomed, dimensions as per the
manufacturer of the testing device. It shall be supported in a vertical position in the cooling device
(6.7), and shall be capable of being cleaned.
6.5 Disc (optional, depending on the design of the equipment), made of any insulating material
(for example cork or felt) approximately 6 mm in thickness, to fit loosely inside the jacket to maintain
the test jar and avoid any direct c
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