SIST EN ISO 16784-2:2025

SLOVENSKI STANDARD
oSIST prEN ISO 16784-2:2023
01-december-2023
Korozija kovin in zlitin - Korozija in obraščanje v industrijskih vodnih hladilnih
sistemih - 2. del: Vrednotenje učinkovitosti programov obdelovanja s hladilno
tekočino z uporabo opreme za preskuševališča pilotne serije (ISO/DIS 16784-
2:2023)
Corrosion of metals and alloys - Corrosion and fouling in industrial cooling water systems
- Part 2: Evaluation of the performance of cooling water treatment programmes using a
pilot-scale test rig (ISO/DIS 16784-2:2023)
Korrosion von Metallen und Legierungen - Korrosion und Fouling in industriellen
Kühlwassersystemen - Teil 2: Bewertung der Leistung von Kühlwasser-
Behandlungsprogrammen unter Anwendung eines Modell‑Prüfstands (ISO/DIS 16784-
2:2023)
Corrosion des métaux et alliages - Corrosion et entartrage des circuits de
refroidissement à eau industriels - Partie 2: Évaluation des performances des
programmes de traitement d'eau de refroidissement sur banc d'essai pilote (ISO/DIS
16784-2:2023)
Ta slovenski standard je istoveten z: prEN ISO 16784-2
ICS:
77.060 Korozija kovin Corrosion of metals
oSIST prEN ISO 16784-2:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 16784-2:2023
oSIST prEN ISO 16784-2:2023
DRAFT INTERNATIONAL STANDARD
ISO/DIS 16784-2
ISO/TC 156 Secretariat: SAC
Voting begins on: Voting terminates on:
2023-09-18 2023-12-11
Corrosion of metals and alloys — Corrosion and fouling in
industrial cooling water systems —
Part 2:
Evaluation of the performance of cooling water treatment
programmes using a pilot-scale test rig
Corrosion des métaux et alliages — Corrosion et entartrage des circuits de refroidissement à eau
industriels —
Partie 2: Évaluation des performances des programmes de traitement d'eau de refroidissement sur banc
d'essai pilote
ICS: 77.060
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 16784-2:2023(E)
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. © ISO 2023

oSIST prEN ISO 16784-2:2023
ISO/DIS 16784-2:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 16784-2
ISO/TC 156 Secretariat: SAC
Voting begins on: Voting terminates on:

Corrosion of metals and alloys — Corrosion and fouling in
industrial cooling water systems —
Part 2:
Evaluation of the performance of cooling water treatment
programmes using a pilot-scale test rig
Corrosion des métaux et alliages — Corrosion et entartrage des circuits de refroidissement à eau
industriels —
Partie 2: Évaluation des performances des programmes de traitement d'eau de refroidissement sur banc
d'essai pilote
ICS: 77.060
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
IN ADDITION TO THEIR EVALUATION AS
or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
Phone: +41 22 749 01 11
WHICH REFERENCE MAY BE MADE IN
Reference number
Email: copyright@iso.org
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 16784-2:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

oSIST prEN ISO 16784-2:2023
ISO/DIS 16784-2:2023(E)
Contents Page
Foreword .iv
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 3
5 Water for test .3
5.1 General . 3
5.2 Water characteristics . 4
5.3 Preparation of synthetic test waters using mother solutions . 4
6 Apparatus . 5
6.1 Heat exchanger section . 5
6.2 Temperature measurement . 5
6.3 Circulation-rate monitor . . 5
6.4 Make-up, evaporation and blow-down measurement . 5
6.5 Cooling tower . 5
6.6 Heating system . 6
6.7 Water treatment equipment simulation device . 6
6.8 On-line detection device . 6
7 Test method . 6
7.1 Procedure . 6
7.1.1 Cleaning of the test assembly . 6
7.1.2 Test tube preparation and pre-treatment . 6
7.1.3 System water content . 7
7.1.4 Procedure to fill the cooling water system . 7
7.1.5 Heating the test tubes . 8
7.1.6 Flow rate . 8
7.1.7 Blow-down and half-life . 8
7.1.8 Biocide treatment . 8
7.1.9 Make-up water for cooling-tower use. 9
7.2 Determination of analytical and control parameters . 9
7.3 Test data reporting . 9
7.4 Test termination . 9
8 Assessment of results .10
8.1 Recording of cooling water quality . 10
8.2 Treatment of the test tubes . 10
8.3 Assessment of results on deposition and fouling . 10
8.4 Assessment of results on corrosion . 11
8.4.1 Corrosion phenomena and type of corrosion. . 11
8.4.2 Pitting corrosion. 11
8.4.3 Corrosion rate . 11
9 Test report .11
Annex A (informative) Test data sheet on the performance of cooling water treatment
programmes .13
Annex B (informative) Further information on some methods of measurement and test.16
Bibliography .21
iii
oSIST prEN ISO 16784-2:2023
ISO/DIS 16784-2:2023(E)
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 documents 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).
Attention is drawn to the possibility that some of
...