EN ISO 7278-2:2022/prA1:2025
(Amendment)Petroleum measurement systems - Part 2: Pipe prover design, calibration and operation - Amendment 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)
Merilni sistemi za nafto - 2. del: Načrtovanje, kalibracija in delovanje merilnika cevi - Dopolnilo 1 (ISO 7278-2:2022/DAmd1:2025)
General Information
- Status
- Not Published
- Publication Date
- 25-Apr-2027
- Technical Committee
- CEN/TC 19 - Petroleum products, lubricants and related products
- Current Stage
- 4060 - Closure of enquiry - Enquiry
- Start Date
- 24-Dec-2025
- Completion Date
- 24-Dec-2025
Relations
- Effective Date
- 30-Apr-2025
Overview
EN ISO 7278-2:2022/prA1:2025 is a CEN-adopted amendment to ISO 7278-2:2022 - Petroleum measurement systems - Part 2: Pipe prover design, calibration and operation. This draft amendment (Amendment 1) updates procedures for prover leakage checks, sphere (displacer) inspection and sizing, measurement uncertainty guidance, and documentation requirements during calibration. It is intended to improve repeatability and traceability of volumetric prover calibrations used in custody transfer and process measurement of liquid hydrocarbons.
Key topics and technical requirements
- Pre-calibration leak checks: Systems must be checked for leakage before calibration. This includes operation and leak testing of four-way valves and seal leakage tests for piston provers. A sphere displacer should be safely withdrawn for inspection.
- Sphere inspection and sizing (new Clause 6.5.4):
- Inspect new and removed spheres for bulges, flats, cuts, abrasions, wear, degradation or softening; check expiry date for new spheres.
- Record an “as found” diameter when extracting spheres.
- Recommended procedure: over-inflate and pressurize spheres to detect seam/pinhole leaks, then vent and set to required inflation.
- Inflation adjustment and measurement guidance: vent air with valve vertical; measure across at least two perpendicular diameters (one across filling valve(s)); report the smallest measured diameter.
- Measurement methods allowed: outside micrometer/calliper (with calibrated length standard), slip rings sized by manufacturer, or a flat diameter/circumference tape. Tools must be calibrated with appropriate uncertainty.
- Ovality limit: difference between largest and smallest diameter should not exceed 1% of nominal diameter (per API MPMS Chapter 4 reference); larger differences indicate a worn sphere.
- Guidance on measurement resolution/uncertainty: aim for discrimination within 0.25% of nominal; example for a 150 mm sphere - uncertainty < 0.4 mm diameter (≈1 mm circumference).
- Note on large spheres: account for distortion under their own weight during measurement.
- Operational impact: underinflation can cause leakage; overinflation can cause pressure loss, judder and poor switch actuation.
- Calibration reporting (Annex H1 addition): Prover must be in good operational condition during calibration; any temporary modifications (e.g., capping leaking drains, manually assisting valves) must be recorded and included in the calibration report.
Applications and users
- Useful for custody transfer measurement, pipeline operators, terminal and refinery measurement teams, calibration laboratories, and equipment manufacturers.
- Applies where pipe provers, piston provers and spherical displacers are used to verify volumetric flow meters for petroleum and liquid hydrocarbon products.
- Helps ensure traceable calibration, consistent prover performance and improved measurement quality for regulatory and commercial transactions.
Related standards
- ISO 7278-2:2022 (parent standard - pipe prover design, calibration and operation)
- API Manual of Petroleum Measurement Standards (MPMS), Chapter 4 - referenced for ovality guidance
Keywords: ISO 7278-2 amendment, pipe prover calibration, sphere inspection, petroleum measurement systems, prover design, measurement uncertainty, pipe prover operation.
Frequently Asked Questions
EN ISO 7278-2:2022/prA1:2025 is a draft 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/DAmd1:2025)". This standard covers: Petroleum measurement systems - Part 2: Pipe prover design, calibration and operation - Amendment 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)
EN ISO 7278-2:2022/prA1:2025 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/prA1:2025 has the following relationships with other standards: It is inter standard links to 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/prA1:2025 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-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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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)
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
ISO/CEN PARALLEL PROCESSING
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.
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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
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
...
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