ISO 4266-3:2024
(Main)Petroleum and liquid petroleum products — Measurement of level and temperature in storage tanks by automatic methods — Part 3: Measurement of level in pressurized storage tanks (non-refrigerated)
Petroleum and liquid petroleum products — Measurement of level and temperature in storage tanks by automatic methods — Part 3: Measurement of level in pressurized storage tanks (non-refrigerated)
This document gives requirements and guidance on the accuracy, installation, commissioning, calibration and verification of automatic level gauges (ALGs) both intrusive and non-intrusive, for measuring the level of petroleum and petroleum products having a vapour pressure less than 4 MPa, stored in pressurized storage tanks. This document gives guidance on the use of ALGs in custody transfer application. This document is not applicable to the measurement of level in caverns and refrigerated storage tanks with ALG equipment.
Pétrole et produits pétroliers liquides — Mesurage du niveau et de la température dans les réservoirs de stockage par méthodes automatiques — Partie 3: Mesurage du niveau dans les réservoirs de stockage sous pression (non réfrigérés)
L'ISO 4266-3 constitue un guide relatif à la précision, à l'installation, à la mise en service, à l'étalonnage et à la vérification des jaugeurs automatiques de niveau de type intrusif et non intrusif, utilisés pour le mesurage de niveau du pétrole et des produits pétroliers, dont la tension de vapeur est inférieure à 4 MPa, et stockés dans des réservoirs de stockage sous pression. L'ISO 4266-3 constitue un guide relatif à l'utilisation des jaugeurs automatiques de niveau dans des transactions commerciales ou fiscales. L'ISO 4266-3 ne s'applique pas au mesurage de niveau par des jaugeurs automatiques, dans des stockages souterrains et dans des réservoirs de stockage réfrigérés.
General Information
Relations
Buy Standard
Standards Content (Sample)
International
Standard
ISO 4266-3
Second edition
Petroleum and liquid petroleum
2024-10
products — Measurement of level
and temperature in storage tanks by
automatic methods —
Part 3:
Measurement of level in pressurized
storage tanks (non-refrigerated)
Pétrole et produits pétroliers liquides — Mesurage du niveau et
de la température dans les réservoirs de stockage par méthodes
automatiques —
Partie 3: Mesurage du niveau dans les réservoirs de stockage sous
pression (non réfrigérés)
Reference number
© 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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .v
1 Scope . 1
2 Normative reference . 1
3 Terms and definitions . 1
4 Precautions . 2
4.1 Safety precautions .2
4.2 Equipment precautions .2
4.3 General precautions .3
5 Accuracy . 3
5.1 Intrinsic error of ALGs .3
5.2 Calibration prior to installation .4
5.3 Error caused by installation and operating conditions .4
5.4 Overall accuracy .4
5.4.1 General .4
5.4.2 Use of ALGs for fiscal/custody transfer applications .4
6 Installation of ALGs . 5
6.1 General .5
6.2 Mounting location .5
6.3 Manufacturer’s requirements .5
6.4 Installation .6
6.4.1 Installation of intrusive ullage ALGs mounted on still-wells .6
6.4.2 Installation of intrusive ullage ALGs using guide wires .7
6.4.3 Installation of non-intrusive ullage ALGs (e.g. microwave or radar) mounted on
still-wells .8
6.4.4 Location of ALG .10
6.4.5 Installation of ALGs other than those described in this document .10
6.5 Still-well design .10
7 Initial setting and initial verification of ALGs in the field .10
7.1 Preparation .10
7.1.1 Checking for critical distances .10
7.1.2 Checking for free movement of level-sensing element of intrusive ALGs.11
7.1.3 Checking for influences of changes in physical and electrical properties of the
product (vapour/liquid) . . . .11
7.2 Initial setting .11
7.2.1 General .11
7.2.2 Setting of intrusive ullage ALGs .11
7.2.3 Setting of non-intrusive ALGs. 12
7.2.4 Other ALGs not described in this document . 12
7.3 Initial field verification . 12
7.3.1 General . 12
7.3.2 V erification procedure . 13
7.3.3 Tolerance of initial field verification. 13
7.4 Record keeping . 13
8 Subsequent verification of ALGs .13
8.1 General . 13
8.2 Frequency of subsequent verification. 13
8.3 Procedure .14
8.4 Tolerance for subsequent verification of ALGs in fiscal/custody transfer application .14
8.5 Comparison of the ALG readings from current and previous verifications .14
8.6 Adjustment in subsequent verification . 15
9 Data communication and receiving .15
iii
Bibliography .16
iv
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, Subcommittee SC 2, Measurement of petroleum and related
products.
This second edition cancels and replaces the first edition (ISO 4266-3:2002), which has been technically
revised.
The main changes are as follows:
— terms and definitions in Clause 3 have been updated;
— in 4.3.2, the level that is measured and recorded simultaneously with the temperatures has been clarified;
— in 5.2, the information on calibration prior to installation has been updated;
— in Clause 6, the design requirements for still-wells have been clarified and the limitation of non-perforated
still-wells removed.
A list of all parts in the ISO 4266 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.
v
International Standard ISO 4266-3:2024(en)
Petroleum and liquid petroleum products — Measurement
of level and temperature in storage tanks by automatic
methods —
Part 3:
Measurement of level in pressurized
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.