SIST EN ISO 7278-2:2023/A1:2026

• Status: Published
• Public Enquiry End Date: 23-Dec-2025
• Publication Date: 15-Jul-2026
• ICS: 75.180.30 - Volumetric equipment and measurements
• Technical Committee: NAD - Petroleum products, lubricants and related products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 24-Jun-2026
• Due Date: 29-Aug-2026
• Completion Date: 16-Jul-2026
• Ref Project: EN ISO 7278-2:2022/A1:2026 - Petroleum measurement systems - Part 2: Pipe prover design, calibration and operation - Amendment 1 (ISO 7278-2:2022/Amd 1:2026)

• Amends: SIST EN ISO 7278-2:2023 - Petroleum measurement systems - Part 2: Pipe prover design, calibration and operation (ISO 7278-2:2022)
• Effective Date: 01-Sep-2026

Overview

SIST EN ISO 7278-2:2023/A1:2026 is an essential international standard amendment focused on petroleum measurement systems, specifically addressing the design, calibration, and operation of pipe provers. This amendment enhances the base ISO 7278-2:2022 standard with updated procedures and inspection requirements, ensuring improved accuracy and reliability in volumetric measurement systems used across the petroleum industry. Developed by the Slovenian Institute for Standardization (SIST) in collaboration with international committees, this standard amendment is pivotal for stakeholders involved in flow measurement, custody transfer, and the operation of pipe provers.

Key Topics

The main additions and modifications introduced by this amendment cover critical aspects of pipe prover operation and calibration:

• Leak Testing Procedures: Addition of guidance to check for system leakage prior to calibration, including four-way valve operation and piston prover seal checks.
• Sphere Inspection and Sizing: New clause outlining detailed steps for sphere removal, visual inspection, inflation, and diameter measurement. Recommendations for manufacturer specifications and inspections for surface defects or wear are provided to improve validation of spheres used in provers.
• Measurement Methods: Guidance on three standard measurement tools-outside micrometres, slip rings, and diameter/circumference tapes-with advice on calibration and accuracy requirements to ensure traceability and consistent measurement results.
• Inflation and Ovality Checks: Requirements for verifying sphere sizing and assessing acceptable ovality, setting limits for measurement discrimination and uncertainty.
• Calibration Recordkeeping: New requirements for identifying and documenting any temporary modifications made during calibration, such as sealing leaking drains or manually assisting valve operation.

Applications

This amendment to ISO 7278-2 is directly relevant for:

• Petroleum Terminal Operators: Ensuring accurate custody transfer and inventory measurement through pipe prover calibration.
• Flow Meter Verification: Supporting calibration and periodic verification of flow meters in refineries, pipelines, and distribution systems.
• Quality Assurance Teams: Implementing robust procedures for prover sphere inspection, measurement, and traceability.
• Equipment Manufacturers: Aligning fabrication and maintenance processes of pipe provers with new inspection and calibration guidelines.
• Testing Laboratories: Incorporating internationally agreed measurement uncertainty and discrimination values for calibration services.

By applying these updated procedures, organizations can minimize measurement errors, document calibration interventions, and comply with international best practices, enhancing operational integrity and efficiency.

Related Standards

While SIST EN ISO 7278-2:2023/A1:2026 is a targeted amendment, it operates within a broader landscape of measurement and calibration standards, including:

• ISO 7278-2:2022: The base international standard for pipe prover design, calibration, and operation.
• API MPMS Chapter 4, Section 9, Part 2: Referenced guidelines for verifying sphere ovality and measurement uncertainty within the amendment.
• ISO 9001 (Quality Management Systems): For integrating measurement and calibration controls into comprehensive quality programs.
• Other Volumetric Measurement Standards: Such as ISO 3171 and ISO 4267, supporting various aspects of petroleum fluid measurement.

Practical Value

Adopting SIST EN ISO 7278-2:2023/A1:2026 delivers significant advantages, such as:

• Enhanced measurement integrity and confidence in custody transfer operations
• Improved detection and correction of equipment failures and measurement drift
• Clear documentation and traceability for compliance and auditing purposes
• Alignment with latest international and industry best practices

For all organizations involved in petroleum measurement, this amendment is a cornerstone document for ensuring operational excellence and regulatory compliance in volumetric flow measurement.

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
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ISO copyright office
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Phone: [phone]
Email: [e-mail]
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
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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)
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this may not represent the latest information, which may be obtained from the patent database available at
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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
...