ISO 4266-6:2024
(Main)Petroleum and liquid petroleum products — Measurement of level and temperature in storage tanks by automatic methods — Part 6: Measurement of temperature in pressurized storage tanks (non-refrigerated)
Petroleum and liquid petroleum products — Measurement of level and temperature in storage tanks by automatic methods — Part 6: Measurement of temperature in pressurized storage tanks (non-refrigerated)
This document gives guidance and recommendations on the selection, accuracy, installation, commissioning, calibration and verification of automatic tank thermometers (ATTs) in fiscal/custody transfer applications, in which the ATT is used for measuring the temperature of petroleum and liquid petroleum products stored in pressurized storage tanks. This document is not applicable to the measurement of temperature in caverns or in refrigerated storage tanks.
Pétrole et produits pétroliers liquides — Mesurage du niveau et de la température dans les réservoirs de stockage par méthodes automatiques — Partie 6: Mesurage de la température dans les réservoirs de stockage sous pression (non réfrigérés)
La présente partie de l'ISO 4266 constitue un guide relatif au choix, à la précision, à l'installation, à la mise en service et à la vérification des thermomètres de mesure automatique de la température dans les réservoirs, utilisés lors de transactions commerciales et fiscales, lorsque le thermomètre de mesure automatique de température est utilisé pour le mesurage de la température du pétrole et des produits pétroliers stockés dans des réservoirs sous pression. La présente partie de l'ISO 4266 ne s'applique pas au mesurage de la température dans des stockages souterrains, ou dans des réservoirs de stockage réfrigérés.
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International
Standard
ISO 4266-6
Second edition
Petroleum and liquid petroleum
2024-10
products — Measurement of level
and temperature in storage tanks by
automatic methods —
Part 6:
Measurement of temperature 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 6: Mesurage de la température dans les réservoirs de
stockage sous pression (non réfrigérés)
Reference number
© ISO 2024
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Published in Switzerland
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Contents Page
Foreword .iv
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 General .3
5.2 Intrinsic error of ATTs .3
5.3 Calibration prior to installation .3
5.3.1 General .3
5.3.2 ATT calibrated as a system .4
5.3.3 ATT calibrated by components .4
5.3.4 Multiple-point ATTs .4
5.3.5 Uncertainty of the reference .4
5.4 Error caused by installation and operating conditions .4
5.5 Overall accuracy . .4
5.5.1 General .4
5.5.2 Use of ATT for fiscal/custody transfer purposes .5
6 Selection of ATTs . 5
6.1 General .5
6.2 ATTs for fiscal/custody transfer purpose .5
7 Description of ATT equipment . 6
7.1 Introduction .6
7.2 Electrical temperature elements.6
7.2.1 General .6
8 Installation of ATTs . 6
8.1 General .6
8.2 Single-point or spot temperature elements .6
8.3 Multiple-point temperature elements .6
8.4 Moveable spot temperature element .6
8.5 Other methods .7
8.6 Thermowells for electronic temperature elements .7
8.7 Thermowells for verification purposes .7
9 Calibration and field verification of ATTs . 7
9.1 General .7
9.2 Calibration of single-point temperature element ATTs used for fiscal/custody transfer
purpose .7
9.2.1 Calibration prior to installation .7
9.2.2 Initial field verification .8
9.3 Calibration of upper, middle and lower or multiple-point ATTs .8
9.3.1 Calibration prior to installation .8
9.3.2 Initial field verification .9
9.4 Subsequent verification of ATTs .9
9.4.1 General .9
9.4.2 Frequency of subsequent verification .9
9.4.3 Record keeping .10
10 Data communication and receiving . 10
Bibliography .11
iii
Foreword
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bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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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.
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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 4266-6:2002), which has been technically
revised.
The main changes are as follows:
— normative references have been updated;
— in 4.3.2, it has been clarified that the level should be measured and recorded simultaneously with the
temperatures;
— in 7.2.1, equipment has been clarified;
— in 9.4.2, subsequent verification requirements have been clarified.
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.
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International Standard ISO 4266-6:2024(en)
Petroleum and liquid petroleum products — Measurement
of level and temperature in sto
...
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