General Information

Abstract

Status
Published
Publication Date
09-Jun-2026
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
10-Jun-2026
Completion Date
10-Jun-2026

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Amendment

EN ISO 7278-2:2023/A1:2026

English language (9 pages)
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Overview

EN ISO 7278-2:2022/A1:2026 is an amendment to the international standard governing petroleum measurement systems, specifically focusing on pipe prover design, calibration, and operation. Issued by CEN, this amendment refines and clarifies guidelines relevant to pipe prover systems used in volumetric measurement within the oil and gas sector. Pipe provers are critical tools for verifying the accuracy of flow meters, ensuring precision in petroleum measurements and compliance with industrial regulations.

This update introduces new practices and detailed requirements for the inspection and sizing of sphere displacers, leak-check procedures, and calibration report documentation, further supporting accuracy and integrity in petroleum measurement applications.

Key Topics

  • Pipe Prover System Checks:
    Guidelines specify that, before starting calibration, systems must be checked thoroughly for leakage. Leak testing procedures include examining four-way valves and piston provers, as well as proper inspection of the sphere displacer.

  • Sphere Inspection and Measurement:
    The amendment introduces detailed steps for sphere maintenance and sizing:

    • Safe removal and cleaning of spheres prior to inspection
    • Inspection for physical damage, surface wear, and correct inflation
    • Criteria for ordering new or replacement spheres, emphasizing compatibility and appropriate sizing
    • Step-by-step procedures for measuring sphere diameter using micrometers, slip rings, or tapes, including standards for measurement accuracy and equipment calibration
  • Acceptable Tolerances and Measurement Methods:
    The standard outlines the importance of discriminating between acceptable and unacceptable sphere ovality. Measurement uncertainty, calibration intervals, and method resolution are detailed, supporting high-precision volumetric measurement.

  • Documentation of Calibration Modifications:
    Any temporary changes made during calibration - such as capping leaks or manually assisting valve operations - must be documented as observations in the calibration report.

Applications

EN ISO 7278-2:2022/A1:2026 plays a vital role across various applications within the petroleum industry:

  • Flow Meter Calibration:
    Pipe prover systems following this standard ensure highly accurate calibration of flow meters used in custody transfer, pipeline management, and refining operations.

  • Quality Assurance and Compliance:
    Adoption of these guidelines facilitates regulatory compliance, supports audit trails, and upholds measurement traceability in oil and gas transactions.

  • Maintenance and Safety Operations:
    Detailed procedures for sphere inspection and leak detection enhance operational safety and prolong the service life of measurement equipment.

  • Industrial Asset Integrity:
    Accurate measurement practices, backed by structured calibration and rigorous documentation, contribute to optimizing asset performance and reducing product losses.

Related Standards

Organizations implementing EN ISO 7278-2:2022/A1:2026 should also consider the following related standards for a comprehensive approach to petroleum measurement:

  • ISO 7278-2:2022 - Petroleum measurement systems - Pipe prover design, calibration, and operation (base standard)
  • API MPMS Chapter 4, Section 9, Part 2 - Guidelines regarding sphere ovality and measurement procedures
  • EN ISO 5168 - Measurement uncertainty and performance assessment
  • ISO 17025 - Calibration procedures and requirements for laboratory competence

Aligning with these complementary standards ensures that measurement systems are robust, reliable, and suitable for modern petroleum industry requirements.

Keywords: petroleum measurement systems, pipe prover, flow meter calibration, sphere inspection, oil and gas standards, volumetric measurement, leak detection, calibration documentation, EN ISO 7278-2.

Relations

Effective Date
12-Feb-2026
Effective Date
30-Apr-2025

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Amendment

EN ISO 7278-2:2023/A1:2026

English language (9 pages)
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Frequently Asked Questions

EN ISO 7278-2:2022/A1:2026 is a amendment published by the European Committee for Standardization (CEN). Its full title is "Petroleum measurement systems - Part 2: Pipe prover design, calibration and operation - Amendment 1 (ISO 7278-2:2022/Amd 1:2026)". This standard covers: Petroleum measurement systems - Part 2: Pipe prover design, calibration and operation - Amendment 1 (ISO 7278-2:2022/Amd 1:2026)

Petroleum measurement systems - Part 2: Pipe prover design, calibration and operation - Amendment 1 (ISO 7278-2:2022/Amd 1:2026)

EN ISO 7278-2:2022/A1:2026 is classified under the following ICS (International Classification for Standards) categories: 75.180.30 - Volumetric equipment and measurements. The ICS classification helps identify the subject area and facilitates finding related standards.

EN ISO 7278-2:2022/A1:2026 has the following relationships with other standards: It is inter standard links to ISO 7278-2:2022/Amd 1:2026, EN ISO 7278-2:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN ISO 7278-2:2022/A1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


SLOVENSKI STANDARD
01-september-2026
Merilni sistemi za nafto - 2. del: Načrtovanje, kalibracija in delovanje merilnika cevi
- Dopolnilo 1 (ISO 7278-2:2022/Amd 1:2026)
Petroleum measurement systems - Part 2: Pipe prover design, calibration and operation
- Amendment 1 (ISO 7278-2:2022/Amd 1:2026)
Mineralölmesssysteme - Teil 2: Auslegung, Kalibrierung und Betrieb von
Rohrprüfgeräten - Änderung 1 (ISO 7278-2:2022/Amd 1:2026)
Systèmes de mesurage des produits pétroliers - Partie 2: Conception, étalonnage et
fonctionnement des tubes étalons - Amendement 1 (ISO 7278-2:2022/Amd 1:2026)
Ta slovenski standard je istoveten z: EN ISO 7278-2:2022/A1:2026
ICS:
75.180.30 Oprema za merjenje Volumetric equipment and
prostornine in merjenje measurements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 7278-2:2022/A1
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2026
EUROPÄISCHE NORM
ICS 75.180.30
English Version
Petroleum measurement systems - Part 2: Pipe prover
design, calibration and operation - Amendment 1 (ISO
7278-2:2022/Amd 1:2026)
Systèmes de mesurage des produits pétroliers - Partie Mineralölmesssysteme - Teil 2: Auslegung,
2: Conception, étalonnage et fonctionnement des tubes Kalibrierung und Betrieb von Rohrprüfgeräten -
étalons - Amendement 1 (ISO 7278-2:2022/Amd Änderung 1 (ISO 7278-2:2022/Amd 1:2026)
1:2026)
This amendment A1 modifies the European Standard EN ISO 7278-2:2022; it was approved by CEN on 7 June 2026.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant 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 amendment 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7278-2:2022/A1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 7278-2:2022/A1:2026) 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 Amendment to the European Standard EN ISO 7278-2:2022 shall be given the status of a national
standard, either by publication of an identical text or by endorsement, at the latest by December 2026,
and conflicting national standards shall be withdrawn at the latest by December 2026.
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 7278-2:2022/Amd 1:2026 has been approved by CEN as EN ISO 7278-2:2022/A1:2026
without any modification.
International
Standard
ISO 7278-2
Second edition
Petroleum measurement systems —
2022-11
Part 2:
AMENDMENT 1
Pipe prover design, calibration and
2026-06
operation
AMENDMENT 1
Systèmes de mesurage des produits pétroliers —
Partie 2: Conception, étalonnage et fonctionnement des tubes
étalons
AMENDEMENT 1
Reference number
ISO 7278-2:2022/Amd.1:2026(en) © ISO 2026

ISO 7278-2:2022/Amd.1:2026(en)
© ISO 2026
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
ISO 7278-2:2022/Amd.1:2026(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 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, in collaboration with the European Committee for Standardization (CEN) Technical Committee
CEN/TC 19, Gaseous and liquid fuels, lubricants and related products of pet
...