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

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)

Merilni sistemi za nafto - 2. del: Načrtovanje, kalibracija in delovanje merilnika cevi - Dopolnilo 1 (ISO 7278-2:2022/Amd 1:2026)

General Information

• Status: Not Published
• Public Enquiry End Date: 23-Dec-2025
• 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
• 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)

Relations

• 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-Dec-2025

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.

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 7278-2:2023/oprA1:2025
01-december-2025
Merilni sistemi za nafto - 2. del: Načrtovanje, kalibracija in delovanje merilnika cevi
- Dopolnilo 1 (ISO 7278-2:2022/DAmd1:2025)
Petroleum measurement systems - Part 2: Pipe prover design, calibration and operation
- Amendment 1 (ISO 7278-2:2022/DAmd1:2025)
Mineralölmesssysteme - Teil 2: Auslegung, Kalibrierung und Betrieb von
Rohrprüfgeräten - Änderung 1 (ISO 7278 2:2022/DAmd 1:2025)
Systèmes de mesurage des produits pétroliers - Partie 2: Conception, étalonnage et
fonctionnement des tubes étalons - Amendement 1 (ISO 7278-2:2022/DAmd 1:2025)
Ta slovenski standard je istoveten z: EN ISO 7278-2:2022/prA1:2025
ICS:
75.180.30 Oprema za merjenje Volumetric equipment and
prostornine in merjenje measurements
SIST EN ISO 7278-2:2023/oprA1:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN ISO 7278-2:2023/oprA1:2025

SIST EN ISO 7278-2:2023/oprA1:2025
DRAFT
Amendment
ISO 7278-2:2022/
DAM 1
ISO/TC 28/SC 2
Petroleum measurement systems —
Secretariat: BSI
Part 2:
Voting begins on:
Pipe prover design, calibration and
2025-10-01
operation
Voting terminates on:
2025-12-24
AMENDMENT 1
Systèmes de mesurage des produits pétroliers —
Partie 2: Conception, étalonnage et fonctionnement des tubes
étalons
AMENDEMENT 1
ICS: 75.180.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO 7278-2:2022/DAM 1:2025(en)

SIST EN ISO 7278-2:2023/oprA1:2025
DRAFT
ISO 7278-2:2022/DAM 1:2025(en)
Amendment
ISO 7278-2:2022/
DAM 1
ISO/TC 28/SC 2
Petroleum measurement systems —
Secretariat: BSI
Part 2:
Voting begins on:
Pipe prover design, calibration and
operation
Voting terminates on:
AMENDMENT 1
Systèmes de mesurage des produits pétroliers —
Partie 2: Conception, étalonnage et fonctionnement des tubes étalons
AMENDEMENT 1
ICS: 75.180.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
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TO SUBMIT, WITH THEIR COMMENTS,
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NOTIFICATION OF ANY RELEVANT PATENT
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Published in Switzerland Reference number
ISO 7278-2:2022/DAM 1:2025(en)

ii
SIST EN ISO 7278-2:2023/oprA1:2025
ISO 7278-2:2022/DAM 1:2025(en)
Petroleum measurement systems —
Part 2:
Pipe prover design, calibration and operation
AMENDMENT 1
1) Clause 11.2: add a paragraph to the end of clause 11.2.
Prior to commencing the calibration, the system should be checked for leakage. If appropriate the operation
and leak checking of a four-way valve, or a seal leakage test of a piston prover, should be carried out. A
sphere displacer should be withdrawn safely for inspection (clause 13.3). When removed, a sphere can
be positioned on a clean dry and dirt-free surface in a location suitable for measurement to the required
accuracy. It can then be inspected for condition and inflation diameter measured (clause 6.5.4).
2) Clause 6.5.2: -Delete paras 8 to 11
3) Insert new clause 6.5.4
6.5.4  Sphere inspection and sizing
New and spheres which have been removed from a prover should be inspected in the same way. Removal of
a sphere and initial inspection should follow the guidance given in clause 13.3.
When ordering a new or
...