SIST EN ISO 16961:2024/oprA1:2026

• Status: Not Published
• Public Enquiry End Date: 19-Jul-2026
• ICS: 25.220.99 - Other treatments and coatings
• ICS: 75.200 - Petroleum products and natural gas handling equipment
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 22-May-2026
• Due Date: 09-Oct-2026
• Completion Date: 22-Jul-2026
• Ref Project: EN ISO 16961:2024/prA1 - Oil and gas industries including lower carbon energy - Internal coating and lining of steel storage tanks - Amendment 1 (ISO 16961:2024/DAM 1:2026)

• Amends: SIST EN ISO 16961:2024 - Oil and gas industries including lower carbon energy - Internal coating and lining of steel storage tanks (ISO 16961:2024)
• Effective Date: 04-Mar-2026

SIST EN ISO 16961:2024/oprA1:2026 is Amendment 1 to EN ISO 16961:2024 from CEN and ISO/TC 67 for the oil and gas industries including lower carbon energy. It updates the standard for internal coating and lining of steel storage tanks by revising referenced documents, linking a test table to a new informative annex, and adding standard liquid and gas compositions for pre-qualification testing. It is aimed at coating and lining manufacturers, purchasers, and test laboratories that need a common basis for qualification work.

What does SIST EN ISO 16961:2024/oprA1:2026 specify?

SIST EN ISO 16961:2024/oprA1:2026 is a targeted amendment. It changes Clause 2, Table 1 in 6.9.1, adds Annex E, and updates the bibliography.

Amendment part	What it covers
Clause 2	Updated normative references
6.9.1, Table 1	Reference to the new annex for liquid composition
Annex E	Liquid and gas composition for pre-qualification testing
Bibliography	Additional related document

What are the key requirements of SIST EN ISO 16961:2024/oprA1:2026?

SIST EN ISO 16961:2024/oprA1:2026 focuses on how pre-qualification testing is tied to defined test media. The amendment gives laboratories and suppliers a clearer set of compositions to use when checking coating and lining performance.

• Clause 2 updates the reference set. SIST EN ISO 16961:2024/oprA1:2026 replaces ISO 15234 with ISO 15184:2020 and removes ASTM F21. In practice, users should check that their test plans and specification packs point to the updated reference.
• Table 1 in 6.9.1 now points to Annex E. The table keeps its role in the qualification framework, but the liquid composition is now defined in the annex. That means the test medium is no longer left to interpretation.
• Annex E sets standard liquid and gas compositions for pre-qualification testing. Coating and lining manufacturers may pre-qualify to one, more than one, or all of the listed compositions. This lets suppliers match testing to the service fluids a tank will actually see.
• Alternative media need purchaser agreement. The annex allows alternative glycols, alcohols, and gasoline blends only if the purchaser agrees. In practice, the buyer and supplier need to align before a substitute medium is used in testing.
• Non-pressurised equipment uses a different crude oil/water composition. The annex says H2S is omitted for testing in non-pressurised equipment. This matters because the qualification medium must reflect the operating conditions of the tank.
• The annex supports immersion testing with suitable reagent grades. The notes indicate that general purpose reagent grades are suitable for some of the media. Laboratories still need to prepare the mix correctly and document what was used.

What terms does SIST EN ISO 16961:2024/oprA1:2026 define?

• Pre-qualification testing - testing a coating or lining before service to show it performs in defined media.
• Purchaser agreement - the buyer and supplier’s documented agreement to use an alternative medium or blend.
• Non-pressurised equipment - equipment tested or used without internal pressure; in this annex, it affects whether H2S is included.
• Hydrogen sulfide (H2S) - a gas omitted from the crude oil/water composition for non-pressurised equipment.
• Weight by weight (w/w) - a composition basis that states the share of each component by mass.
• Deionised water - water with dissolved ions removed, used here as one of the standard media.
• E10 gasoline - gasoline defined in accordance with EN228:2008 and used as a standard test medium.

Who uses SIST EN ISO 16961:2024/oprA1:2026?

SIST EN ISO 16961:2024/oprA1:2026 is used by coating and lining manufacturers, tank owners, operators, and purchasers who need to qualify internal protection systems for steel storage tanks. It also helps test laboratories, inspection teams, and specification writers working in oil and gas industries including lower carbon energy.

In practice, these users rely on the amendment when selecting test fluids, writing purchase requirements, comparing qualification results, and checking whether a coating system has been pre-qualified for the intended service environment.

What changed in SIST EN ISO 16961:2024/oprA1:2026 from the previous edition?

SIST EN ISO 16961:2024/oprA1:2026 makes these stated changes:

• Replaces ISO 15234 with ISO 15184:2020 in Clause 2.
• Removes ASTM F21 from Clause 2.
• Replaces ISO 15234 with ISO 15184 in 6.9.1 Table 1.
• Adds the note that the liquid composition is defined in Annex E.
• Adds a new informative Annex E.
• Adds ISO 18796-2:2025 to the bibliography.

Which standards are used with SIST EN ISO 16961:2024/oprA1:2026?

• ISO 15184:2020 - the updated reference named in Clause 2 and Table 1.
• EN 228:2008 - defines the E10 gasoline used in Annex E.
• ISO 18796-2:2025 - added to the bibliography as related guidance on internal coating of carbon steel process vessels.

What does the SIST EN ISO 16961:2024/oprA1:2026 document contain?

SIST EN ISO 16961:2024/oprA1:2026 contains amendment instructions rather than a full rewrite of the base standard. Its main technical addition is Annex E, which provides standard liquid and gas compositions for pre-qualification testing.

Annex E covers crude oil/water, gas condensate, seawater, glycol, aviation fuel, alcohol, gasoline, and deionised water. It also gives notes on reagent grades, purchaser-approved alternatives, and the omission of H2S for non-pressurised equipment.

The amendment also links Table 1 in 6.9.1 to the annex so readers can trace the stated liquid composition to its detailed definition.

SLOVENSKI STANDARD
01-julij-2026
Naftna in plinska industrija, vključno z nizkoogljično energijo - Notranji premazi in
obloge jeklenih rezervoarjev za shranjevanje - Dopolnilo A1 (ISO 16961:2024/DAM
1:2026)
Oil and gas industries including lower carbon energy - Internal coating and lining of steel
storage tanks - Amendment 1 (ISO 16961:2024/DAM 1:2026)
Öl- und Gasindustrie einschließlich kohlenstoffarmer Energieträger - Innere
Schutzbeschichtungen und Auskleidungen für überirdische Stahltanklager - Änderung 1
(ISO 16961:2024/DAM 1:2026)
Industries du pétrole et du gaz y compris les énergies à faible teneur en carbone -
Revêtement intérieur et doublure interne des réservoirs de stockage en acier -
Amendement 1 (ISO 16961:2024/DAM 1:2026)
Ta slovenski standard je istoveten z: EN ISO 16961:2024/prA1
ICS:
25.220.99 Druge obdelave in prevleke Other treatments and
coatings
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
Amendment
ISO 16961:2024/
DAM 1
ISO/TC 67
Oil and gas industries including
Secretariat: NEN
lower carbon energy — Internal
coating and lining of steel storage
Voting begins on:
2026-05-04
tanks
Voting terminates on:
AMENDMENT 1 2026-07-27
ICS: 75.200
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 is circulated as received from the committee 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 16961:2024/DAM 1:2026(en)
DRAFT
ISO 16961:2024/DAM 1:2026(en)
Amendment
ISO 16961:2024/
DAM 1
ISO/TC 67
Oil and gas industries including
Secretariat: NEN
lower carbon energy — Internal
coating and lining of steel storage
Voting begins on:
tanks
Voting terminates on:
AMENDMENT 1
ICS: 75.200
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 is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
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.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO 16961:2024/DAM 1:2026(en)
ii
ISO 16961:2024/DAM 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 IS
...