ISO 4266-2:2023

Petroleum and liquid petroleum products — Measurement of level and temperature in storage tanks by automatic methods — Part 2: Measurement of level in marine vessels

This document gives guidance on the accuracy, installation, calibration and verification of automatic level gauges (ALGs), both intrusive and non-intrusive, for measuring the level of petroleum and liquid petroleum products having a Reid vapour pressure less than 100 kPa, transported aboard marine vessels (i.e. tankers and barges). This document gives guidance for buyers and sellers who mutually agree to use marine ALGs for either fiscal and/or custody transfer applications. This document is not applicable to the measurement of level in refrigerated cargo tanks. NOTE For information on the measurement of level in refrigerated cargo tanks, please see ISO 18132-1 and ISO 18132-3.

Pétrole et produits pétroliers liquides — Mesurage du niveau et de la température dans les réservoirs de stockage par des méthodes automatiques — Partie 2: Mesurage du niveau dans les citernes de navire

L'ISO 4266-2 constitue un guide relatif à la précision, à l'installation, à l'étalonnage et à la vérification des jaugeurs automatiques de mesure de niveau, qu'ils soient intrusifs ou non intrusifs. Ils sont utilisés pour le mesurage du niveau de pétrole et de produits pétroliers dont la tension de vapeur est inférieure à 100 kPa et qui sont transportés à bord de navires ( pétroliers et barges). L'ISO 4266-2 constitue un guide pour les acheteurs et les vendeurs qui ont passé un accord mutuel relatif à l'utilisation de jaugeurs de niveau d'application marine à des fins de transactions commerciales ou fiscales. L'ISO 4266-2 ne s'applique pas au mesurage de niveau à bord de navires à réservoirs réfrigérés.

General Information

• Status: Published
• Publication Date: 29-Nov-2023
• ICS: 75.180.30 - Volumetric equipment and measurements
• Technical Committee: ISO/TC 28/SC 2 - Measurement of petroleum and related products
• Drafting Committee: ISO/TC 28/SC 2 - Measurement of petroleum and related products
• Current Stage: 6060 - International Standard published
• Start Date: 30-Nov-2023
• Due Date: 10-Aug-2025
• Completion Date: 30-Nov-2023

Relations

• Revises: ISO 4266-2:2002 - Petroleum and liquid petroleum products — Measurement of level and temperature in storage tanks by automatic methods — Part 2: Measurement of level in marine vessels
• Effective Date: 13-Aug-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 4266-2
Second edition
2023-11
Petroleum and liquid petroleum
products — Measurement of level
and temperature in storage tanks by
automatic methods —
Part 2:
Measurement of level in marine
vessels
Pétrole et produits pétroliers liquides — Mesurage du niveau et de
la température dans les réservoirs de stockage par des méthodes
automatiques —
Partie 2: Mesurage du niveau dans les citernes de navire
Reference number
ISO 4266-2:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 4266-2:2023(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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 4266-2:2023(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Precautions . 3
4.1 Safety precautions . 3
4.1.1 General . 3
4.1.2 Equipment precautions . 3
4.2 General recommendations . 3
4.2.1 Accuracy and performance . 3
4.2.2 Speed of response . 3
4.2.3 Protection from mechanical damage . 4
4.2.4 Manual gauging . 4
4.2.5 Minimum measurable level . 4
4.2.6 Trim and list . 4
4.2.7 Product temperatures . 4
4.2.8 Compatibility . 4
4.2.9 Entrained air and vapour .
...

INTERNATIONAL ISO
STANDARD 4266-2
Second edition
2023-11
Petroleum and liquid petroleum
products — Measurement of level
and temperature in storage tanks by
automatic methods —
Part 2:
Measurement of level in marine
vessels
Pétrole et produits pétroliers liquides — Mesurage du niveau et de
la température dans les réservoirs de stockage par des méthodes
automatiques —
Partie 2: Mesurage du niveau dans les citernes de navire
PROOF/ÉPREUVE
Reference number
ISO 4266-2:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 4266-2:2023(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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
PROOF/ÉPREUVE © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 4266-2:2023(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Precautions . 3
4.1 Safety precautions . 3
4.1.1 General . 3
4.1.2 Equipment precautions . 3
4.2 General recommendations . 3
4.2.1 Accuracy and performance . 3
4.2.2 Speed of response . 3
4.2.3 Protection from mechanical damage . 4
4.2.4 Manual gauging . 4
4.2.5 Minimum measurable level . 4
4.2.6 Trim and list . 4
4.2.7 Product temperatures . 4
4.2.8 Compatibility . 4
4.2.9 Entrained air and vapour .
...

2023-08-10 Style Definition: Heading 1: Indent: Left: 0 pt, First
line: 0 pt, Tab stops: Not at 21.6 pt
ISO 4266-2:2023(E)
Style Definition: Heading 2: Font: Bold, Tab stops: Not
at 18 pt
ISO/TC 28/SC 2
Style Definition: Heading 3: Font: Bold
Style Definition: Heading 4: Font: Bold
DATE: 2023-xx
Style Definition: Heading 5: Font: Bold
Secretariat: BSI
Style Definition: Heading 6: Font: Bold
Style Definition: TOC Heading: Indent: Left: 0 pt, First
Petroleum and liquid petroleum products — Measurement of level and temperature in
line: 0 pt, Tab stops: Not at 21.6 pt
storage tanks by automatic methods —
Part 2: Measurement of level in marine vessels Style Definition: ANNEX
Style Definition: AMEND Terms Heading: Font: Bold
Pétrole et produits pétroliers liquides — Mesurage du niveau et de la température dans les
Style Definition: AMEND Heading 1 Unnumbered:
réservoirs de stockage par des méthodes automatiques —
Font: Bold
Partie 2: Mesurage du niveau dans les citernes de navire
Formatted: Font: Not Bold, Italic
Formatted: Font: Italic

---------------------- Page: 1 ----------------------
ISO 4266-2:2023(E)
© ISO 2023
Formatted: Pattern: Clear
Formatted: Pattern: Clear
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]
Fax: [phone]
Email: [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 4266-2:2023(E)
Contents Page
Foreword Error! Bookmark not defined.
Introduction Error! Bookmark not defined.
1 Scope Error! Bookmark not defined.
2 Normative references Error! Bookmark not defined.
3 Terms and definitions Error! Bookmark not defined.
4 Precautions Error! Bookmark not defined.
4.1 Safety precautions Error! Bookmark not defined.
4.1.1 General Error! Bookmark not defined.
4.1.2 Equipment precautions Error! Bookmark not defined.
4.2 General precautions Error! Bookmark not defined.
4.2.1 Accuracy and performance Error! Bookmark not defined.
4.2.2 Speed of response Error! Bookmark not defined.
4.2.3 Protection from mechanical damage Error! Bookmark not defined.
4.2.4 Manual gauging Error! Bookmark not defined.
4.2.5 Minimum measurable level Error! Bookmark not defined.
4.2.6 Trim and list Error! Bookmark not defined.
4.2.7 Product temperatures Error! Bookmark not defined.
4.2.8 Compatibility Error! Bookmark not defined.
4.2.9 Entrained air and vapour Error! Bookmark not defined.
4.2.10 Vessel motion Error! Bookmark not defined.
4.3 Use of marine ALGs in fiscal/custody transfer Error! Bookmark not defined.
5 Accuracy Error! Bookmark not defined.
5.1 Intrinsic error of ALGs Error! Bookmark not defined.
5.2 Calibration prior to installation Error! Bookmark not defined.
5.3 Initial shipyard adjustment Error! Bookmark not defined.
5.4 Error caused by operating conditions Error! Bookmark not defined.
5.5 Overall accuracy Error! Bookmark not defined.
5.5.1 General Error! Bookmark not defined.
5.5.2 Use of ALGs for fiscal/custody transfer purposes Error! Bookmark not defined.
6 Installation of marine ALGs Error! Bookmark not defined.
6.1 General Error! Bookmark not defined.
6.2 Location of ALG Error! Bookmark not defined.
6.3 Location of manual calibration check point Error! Bookmark not defined.
6.4 Gauging of inerted tanks Error! Bookmark not defined.
7 Onboard verification of marine ALGs Error! Bookmark not defined.
7.1 General precautions Error! Bookmark not defined.
© ISO 2023 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO 4266-2:2023(E)
7.1.1 Check for smooth operation of level-sensing elements— at the shipyard Error!
Bookmark not defined.
7.1.2 ALG technology-specific considerations Error! Bookmark not defined.
7.2 Verification by innage gauging or ullage gauging Error! Bookmark not defined.
7.3 Initial verification Error! Bookmark not defined.
7.4 Subsequent verification Error! Bookmark not defined.
7.4.1 General Error! Bookmark not defined.
7.4.2 Agreement between ALG reading and manual gauge readingError! Bookmark not
defined.
7.4.3 Use of average gauge readings Error! Bookmark not defined.
7.4.4 Adjustment of the ALG Error! Bookmark not defined.
7.5 Verification by alternate methods Error! Bookmark not defined.
7.6 Schedule for regular ALG verification Error! Bookmark not defined.
7.7 Record keeping Error! Bookmark not defined.
8 Data communication and receiving Error! Bookmark
...