SIST EN ISO 28765:2023
(Main)Vitreous and porcelain enamels - Design of bolted steel tanks for the storage or treatment of water or municipal or industrial effluents and sludges (ISO 28765:2022)
Vitreous and porcelain enamels - Design of bolted steel tanks for the storage or treatment of water or municipal or industrial effluents and sludges (ISO 28765:2022)
This document specifies the requirements for the design and use of vitreous enamel coated bolted
cylindrical steel tanks for the storage or treatment of water or municipal or industrial effluents and
sludges.
It is applicable to the design of the tank and any associated roof and gives guidance on the requirements
for the design of the foundation.
It is applicable where:
a) the tank is cylindrical and is mounted on a load-bearing base substantially at or above ground level;
b) the product of the tank diameter in metres and the wall height in metres lies within the range
5 to 500;
c) the tank diameter does not exceed 100 m and the total wall height does not exceed 50 m;
d) the stored material has the characteristics of a liquid, exerting a negligible frictional force on the
tank wall; the stored material can be undergoing treatment as part of a municipal or industrial
effluent treatment process;
e) the internal pressure in the headspace above the liquid does not exceed 50 kPa and the internal
partial vacuum above the liquid does not exceed 10 kPa;
f) the walls of the tank are vertical;
g) the floor of the tank is substantially flat at its intersection with the wall; the floor of the tank can
have a rise or fall built in to allow complete emptying of the tank contents, the slope of which does
not exceed 1:100;
h) there is negligible inertial and impact load due to tank filling;
i) the minimum thickness of the tank shell is 1,5 mm;
j) the material used for the manufacture of the steel sheets is carbon steel (tanks constructed of
sheets made from aluminium or stainless steel are outside the scope of this document);
k) the temperature of the tank wall during operation is within the range −50 °C to +100 °C under all
operating conditions.
This document also gives details of procedures to be followed during installation on site and for
inspection and maintenance of the installed tank.
It does not apply to chemical-reaction vessels.
It does not cover resistance to fire.
Emails und Emaillierungen - Gestaltung von verschraubten Stahlbehältern für die Speicherung oder Behandlung von Wasser oder kommunalen und industriellen Abwässern und Abwasserschlamm (ISO 28765:2022)
Dieses Dokument legt die Anforderungen an Gestaltung und Gebrauch von emailbeschichteten, verschraubten, zylindrischen Stahlbehältern für die Speicherung oder Behandlung von Wasser oder kommunalen oder industriellen Abwässern und Abwasserschlamm fest.
Es ist anwendbar für die Gestaltung des Behälters und jeglichen zugehörigen Dachs und liefert Leitlinien für die Anforderungen an die Gestaltung des Fundamentes.
Es ist anwendbar, wenn:
a) der Behälter zylindrisch und auf einer beanspruchungsfähigen Grundplatte befestigt ist, die sich im Wesentlichen auf Bodenhöhe oder darüber befindet;
b) der Behälterdurchmesser, in Meter, multipliziert mit der Wandhöhe, in Meter, einen Wert im Bereich von 5 bis 500 ergibt;
c) der Behälterdurchmesser nicht größer als 100 m und die Gesamthöhe des Behälters nicht größer als 50 m ist;
d) der gespeicherte Stoff die Eigenschaften einer Flüssigkeit hat, die eine vernachlässigbare Reibungskraft auf die Behälterwand ausübt; der gespeicherte Stoff im Rahmen des Aufbereitungsprozesses von kommunalen und industriellen Abwässern einer Behandlung unterzogen werden kann;
e) der Innendruck im Gasraum oberhalb der Flüssigkeit nicht größer als 50 kPa ist und das innere, partielle Vakuum oberhalb der Flüssigkeit 10 kPa nicht überschreitet;
f) die Wände des Behälters senkrecht sind;
g) der Boden des Behälters an der Schnittfläche mit der Behälterwand im Wesentlichen eben ist; der Behälterboden eine Neigung haben kann, damit sein vollständiges Entleeren ermöglicht wird, wobei diese Neigung nicht mehr als 1 : 100 beträgt;
h) die durch die Behälterfüllung erzeugte Trägheitskraft und Stoßbeanspruchung vernachlässigbar sind;
i) die Mindestdicke des Behältermantels 1,5 mm beträgt;
j) für die Herstellung der Stahlbleche Kohlenstoffstahl verwendet wird (Behälter aus Blechen aus Aluminium oder nichtrostendem Stahl fallen nicht in den Anwendungsbereich dieses Dokuments);
k) die Temperatur der Behälterwand im Einsatz bei allen Betriebsbedingungen innerhalb des Bereiches von −50 °C bis +100 °C liegt.
Dieses Dokument enthält darüber hinaus Einzelheiten zu Verfahren, die während der Montage auf der Baustelle sowie bei Inspektion und Instandhaltung des eingebauten Behälters zu befolgen sind.
Es ist nicht anzuwenden für chemische Reaktionsbehälter.
Es umfasst nicht die Feuerbeständigkeit.
Émaux vitrifiés - Conception de réservoirs en acier boulonnés pour le stockage ou le traitement des eaux ou des effluents d'eaux usées urbains ou industriels (ISO 28765:2022)
Le présent document établit les exigences relatives à la conception et à l’utilisation de réservoirs cylindriques en acier boulonnés revêtus d’émail vitrifié pour le stockage ou le traitement des eaux ou des effluents d’eaux usées urbains ou industriels.
Il s’applique à la conception de réservoirs ainsi que de tout toit les couvrant et fournit des recommandations relatives aux exigences concernant la conception de l’assise.
Il s’applique lorsque:
a) le réservoir est cylindrique et qu’il est monté sur une surface portante située en grande partie au niveau du sol ou au-dessus du niveau du sol;
b) le produit du diamètre du réservoir, en mètres, et de la hauteur de paroi, en mètres, est compris entre 5 et 500;
c) le diamètre du réservoir ne dépasse pas 100 m, et la hauteur totale de paroi ne dépasse pas 50 m;
d) le matériau stocké a les caractéristiques d’un liquide, exerçant une force de frottement négligeable sur la paroi du réservoir; il peut être soumis à un traitement faisant partie d’un processus de traitement des effluents d’eaux usées urbains ou industriels;
e) la pression interne de l’espace libre au-dessus du liquide ne dépasse pas 50 kPa et la pression du vide partiel interne au-dessus du liquide ne dépasse pas 10 kPa;
f) les parois du réservoir sont verticales;
g) le fond du réservoir est essentiellement plat à l’intersection avec la paroi; il peut être incliné afin de permettre une vidange complète du réservoir, sa pente ne devant pas dépasser 1 %;
h) la charge d’impact et d’inertie liée au remplissage du réservoir est négligeable;
i) l’épaisseur minimale de l’enveloppe du réservoir est de 1,5 mm;
j) le matériau utilisé pour la fabrication des tôles est un acier au carbone (les réservoirs construits à partir de tôles d’aluminium ou d’acier inoxydable ne relèvent pas du domaine d’application du présent document);
k) la température de la paroi du réservoir en cours de fonctionnement se situe entre −50 °C et +100 °C dans toutes les conditions de fonctionnement.
Le présent document fournit également des informations détaillées concernant les modes opératoires à suivre durant l’installation sur site ainsi que pour l’inspection et l’entretien du réservoir installé.
Il ne s’applique pas aux réservoirs pour réaction chimique.
Il ne couvre pas la résistance au feu.
Steklasti in porcelanski emajli - Projektiranje s steklastim emajlom zaščitenih jeklenih rezervoarjev za skladiščenje ali pripravo vode ali komunalnih ali industrijskih odplak (ISO 28765:2022)
Ta dokument vzpostavlja zahteve za projektiranje in uporabo s steklastim emajlom zaščitenih valjastih jeklenih rezervoarjev za skladiščenje ali pripravo vode ali komunalnih ali industrijskih odplak.
Uporablja se za projektiranje rezervoarjev in povezanih pokrovov ter vključuje navodila glede zahtev za projektiranje temeljev.
Uporablja se v naslednjih primerih:
a) rezervoar je valjaste oblike in nameščen na nosilnem podstavku pretežno na nivoju tal ali nad njim;
b) izdelek s premerom rezervoarja v metrih in višino stene v metrih je znotraj obsega od 5 do 500;
c) premer rezervoarja ne presega 100 m in skupna višina stene ne presega 50 m;
d) skladiščeni material ima lastnosti tekočine z zanemarljivo silo trenja na stene rezervoarja; skladiščeni material je mogoče obdelati v okviru postopka obdelave komunalnih ali industrijskih odplak;
e) notranji pritisk v plinski fazi nad tekočino ne sme presegati 50 kPa, notranji delni vakuum nad tekočino pa ne sme presegati 10 kPa;
f) stene rezervoarja so navpične;
g) dno rezervoarja je ob stiku s steno pretežno ravno; dno rezervoarja ima lahko vgrajen padec, ki omogoča popolno izpraznitev vsebine iz rezervoarja, z naklonom največ 1 : 100;
h) obstaja zanemarljiva vztrajnostna in naletna obremenitev zaradi polnjenja rezervoarja;
i) najmanjša debelina posode rezervoarja je 1,5 mm;
j) material, uporabljen za izdelavo jeklenih plošč, je ogljikovo jeklo (rezervoarji, izdelani iz plošč iz aluminija ali nerjavnega jekla ne spadajo na področje uporabe tega dokumenta);
k) temperatura stene rezervoarja med obratovanjem je v razponu od –50 do 100 °C pri vseh pogojih obratovanja.
Ta dokument navaja tudi podrobnosti o postopkih, ki jih je treba upoštevati pri namestitvi na mestu uporabe ter pri pregledu in vzdrževanju nameščenega rezervoarja.
Ne uporablja se za posode za kemijske reakcije.
Ne zajema odpornosti proti ognju.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 28765:2023
01-januar-2023
Nadomešča:
SIST EN ISO 28765:2016
Steklasti in porcelanski emajli - Projektiranje s steklastim emajlom zaščitenih
jeklenih rezervoarjev za skladiščenje ali pripravo vode ali komunalnih ali
industrijskih odplak (ISO 28765:2022)
Vitreous and porcelain enamels - Design of bolted steel tanks for the storage or
treatment of water or municipal or industrial effluents and sludges (ISO 28765:2022)
Emails und Emaillierungen - Gestaltung von verschraubten Stahlbehältern für die
Speicherung oder Behandlung von Wasser oder kommunalen und industriellen
Abwässern und Abwasserschlamm (ISO 28765:2022)
Émaux vitrifiés - Conception de réservoirs en acier boulonnés pour le stockage ou le
traitement des eaux ou des effluents d'eaux usées urbains ou industriels (ISO
28765:2022)
Ta slovenski standard je istoveten z: EN ISO 28765:2022
ICS:
23.020.10 Nepremične posode in Stationary containers and
rezervoarji tanks
25.220.50 Emajlne prevleke Enamels
SIST EN ISO 28765:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 28765:2023
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SIST EN ISO 28765:2023
EN ISO 28765
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 25.220.50 Supersedes EN ISO 28765:2016
English Version
Vitreous and porcelain enamels - Design of bolted steel
tanks for the storage or treatment of water or municipal or
industrial effluents and sludges (ISO 28765:2022)
Émaux vitrifiés - Conception de réservoirs en acier Emails und Emaillierungen - Gestaltung von
boulonnés pour le stockage ou le traitement des eaux verschraubten Stahlbehältern für die Speicherung oder
ou des effluents d'eaux usées urbains ou industriels Behandlung von Wasser oder kommunalen und
(ISO 28765:2022) industriellen Abwässern und Abwasserschlamm (ISO
28765:2022)
This European Standard was approved by CEN on 23 October 2022.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a 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 European Standard 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 28765:2022 E
worldwide for CEN national Members.
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SIST EN ISO 28765:2023
EN ISO 28765:2022 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 28765:2023
EN ISO 28765:2022 (E)
European foreword
This document (EN ISO 28765:2022) has been prepared by Technical Committee ISO/TC 107 "Metallic
and other inorganic coatings" in collaboration with Technical Committee CEN/TC 262 “Metallic and
other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys”
the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2023, and conflicting national standards shall be
withdrawn at the latest by May 2023.
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.
This document supersedes EN ISO 28765:2016.
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 28765:2022 has been approved by CEN as EN ISO 28765:2022 without any modification.
3
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SIST EN ISO 28765:2023
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SIST EN ISO 28765:2023
INTERNATIONAL ISO
STANDARD 28765
Third edition
2022-10
Vitreous and porcelain enamels —
Design of bolted steel tanks for the
storage or treatment of water or
municipal or industrial effluents and
sludges
Émaux vitrifiés — Conception de réservoirs en acier boulonnés pour
le stockage ou le traitement des eaux ou des effluents d'eaux usées
urbains ou industriels
Reference number
ISO 28765:2022(E)
© ISO 2022
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SIST EN ISO 28765:2023
ISO 28765:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
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SIST EN ISO 28765:2023
ISO 28765:2022(E)
Contents Page
Foreword .v
1 S c op e . 1
2 Nor m at i ve r ef er enc e s . 2
3 T erms and definitions . 2
4 S y mb ol s . 4
5 Un it s. 5
6 I nformation and requirements to be agreed and documented . 6
6.1 General . 6
6.2 I nformation to be provided by the purchaser . 6
6.3 I nformation to be provided by the designer . 7
7 A ppl ic able s t a nd a r d s .7
8 L o ad s . 8
8.1 General . 8
8 . 2 C ont ent s . 8
8.2.1 General . 8
8.2.2 F reeboard . 8
8.2.3 Hydrostatic pressure . 8
8.2.4 A xial wall forces. 8
8.2.5 F illing and discharging . 8
8.3 T ank structure . 9
8.4 Roof . 9
8.5 E quipment loads . 9
8.5.1 General . 9
8.5.2 S tatic load . 9
8.5.3 Dynamic load . 9
8 . 6 Ac c e s s. 9
8.7 Environmental . 10
8.7.1 G eneral . 10
8.7.2 S eismic action. 10
8 .7. 3 W i nd . 10
8.7.4 Snow . 10
8 .7. 5 Ic e . 10
8.8 A ncillary items . 10
9 D e sig n .11
9.1 G eneral . 11
9.2 Steel . 11
9.2.1 Sp ecification . 11
9.2.2 E ffects of the enamelling process . 11
9.3 T ank . 11
9.3.1 Load factors . 11
9.3.2 T ank walls . 12
9.3.3 Tank roof . . 15
9.3.4 Attachment of walls to floor . 15
9.3.5 Tank floor .15
9.3.6 Ancillary items . 16
9.3.7 Cathodic protection . 16
9.4 Openings . 16
9.4.1 Access manway . 16
9.4.2 Pipe connections . 16
9.4.3 O verflows . 17
9.4.4 Reinforcement of manways and pipe connections in the tank shell . 17
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SIST EN ISO 28765:2023
ISO 28765:2022(E)
9.4.5 Connections in the roof . 17
9.5 E ffects of accidents . 17
9.5.1 R isk assessment . 17
9.5.2 E xplosions . 18
9.5.3 Uncontrolled fluctuation in input stream characteristics . 18
10 Vitreous enamel coating .18
10.1 V itreous enamel . . 18
10.2 C oating . 18
10.3 V itreous enamel quality . 18
10.3.1 Preparation and test frequency . 18
10 . 3 . 2 I n s p e c t ion . 18
10.3.3 On-site rectification . . 19
10.4 P rotection during shipping . 25
10.5 Maintenance . 25
11 I n s t a l l at ion .25
11.1 General information.25
11.2 Foundations . 25
11.3 I nspection of the vitreous enamel coating at the construction site . 25
12 D i s i n f e c t ion .25
Bibliography .27
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SIST EN ISO 28765:2023
ISO 28765:2022(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 the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings,
in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/
TC 262, Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of
metals and alloys, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 28765:2016), which has been technically
revised.
The main changes are as follows:
— the normative references have been updated;
— the terms and definitions have been updated;
— additional information relating to tank installation requirements, foundation requirements, tank
roof openings and tank disinfection requirements have been added;
— additional tank applications have been added to the application guide along with their associated
quality requirements.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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SIST EN ISO 28765:2023
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SIST EN ISO 28765:2023
INTERNATIONAL STANDARD ISO 28765:2022(E)
Vitreous and porcelain enamels — Design of bolted steel
tanks for the storage or treatment of water or municipal or
industrial effluents and sludges
1 S cope
This document specifies the requirements for the design and use of vitreous enamel coated bolted
cylindrical steel tanks for the storage or treatment of water or municipal or industrial effluents and
sludges.
It is applicable to the design of the tank and any associated roof and gives guidance on the requirements
for the design of the foundation.
It is applicable where:
a) the tank is cylindrical and is mounted on a load-bearing base substantially at or above ground level;
b) the product of the tank diameter in metres and the wall height in metres lies within the range
5 to 500;
c) the tank diameter does not exceed 100 m and the total wall height does not exceed 50 m;
d) the stored material has the characteristics of a liquid, exerting a negligible frictional force on the
tank wall; the stored material can be undergoing treatment as part of a municipal or industrial
effluent treatment process;
e) the internal pressure in the headspace above the liquid does not exceed 50 kPa and the internal
partial vacuum above the liquid does not exceed 10 kPa;
f) the walls of the tank are vertical;
g) the floor of the tank is substantially flat at its intersection with the wall; the floor of the tank can
have a rise or fall built in to allow complete emptying of the tank contents, the slope of which does
not exceed 1:100;
h) there is negligible inertial and impact load due to tank filling;
i) the minimum thickness of the tank shell is 1,5 mm;
j) the material used for the manufacture of the steel sheets is carbon steel (tanks constructed of
sheets made from aluminium or stainless steel are outside the scope of this document);
k) the temperature of the tank wall during operation is within the range −50 °C to +100 °C under all
operating conditions.
This document also gives details of procedures to be followed during installation on site and for
inspection and maintenance of the installed tank.
It does not apply to chemical-reaction vessels.
It does not cover resistance to fire.
1
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SIST EN ISO 28765:2023
ISO 28765:2022(E)
2 Normat ive references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic
method
ISO 2746:2015, Vitreous and porcelain enamels — High voltage test
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 4532, Vitreous and porcelain enamels — Determination of the resistance of enamelled articles to
impact — Pistol test
ISO 6370-2, Vitreous and porcelain enamels — Determination of the resistance to abrasion — Part 2: Loss
in mass after sub-surface abrasion
ISO 6769, Vitreous and porcelain enamels — Determination of surface scratch hardness according to the
Mohs scale
ISO 8289-1:2020, Vitreous and porcelain enamels — Low-voltage test for detecting and locating defects —
Part 1: Swab test for non-profiled surfaces
ISO 15686-1, Buildings and constructed assets — Service life planning — Part 1: General principles and
framework
ISO 19496-1, Vitreous and porcelain enamels — Terminology — Part 1: Terms and definitions
ISO 28706-1:2008, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion
— Part 1: Determination of resistance to chemical corrosion by acids at room temperature
ISO 28706-2:2017, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion —
Part 2: Determination of resistance to chemical corrosion by boiling acids, boiling neutral liquids, alkaline
liquids and/or their vapours
ISO 28706-3:2017, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion —
Part 3: Determination of resistance to chemical corrosion by alkaline liquids using a hexagonal vessel or a
tetragonal glass bottle
ISO 28706-4:2016, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion
— Part 4: Determination of resistance to chemical corrosion by alkaline liquids using a cylindrical vessel
ISO 28763:2019, Vitreous and porcelain enamels — Regenerative, enamelled and packed panels for air-gas
and gas-gas heat exchangers — Specifications
EN 1998-4, Eurocode 8 — Design of structures for earthquake resistance — Part 4: Silos, tanks and
pipelines
EN 10209:2013, Cold rolled low carbon steel flat products for vitreous enamelling — Technical delivery
conditions
ANSI/AWWA D 103, Factory-Coated Bolted Steel Tanks for Water Storage
3 T erms and definitions
For the purposes of this document, the terms and definitions given in ISO 19496-1 and the following
apply.
2
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SIST EN ISO 28765:2023
ISO 28765:2
...
SLOVENSKI STANDARD
oSIST prEN ISO 28765:2022
01-marec-2022
Steklasti in porcelanski emajli - Projektiranje s steklastim emajlom zaščitenih
jeklenih rezervoarjev za skladiščenje ali pripravo vode ali komunalnih ali
industrijskih odplak (ISO/DIS 28765:2022)
Vitreous and porcelain enamels - Design of bolted steel tanks for the storage or
treatment of water or municipal or industrial effluents and sludges (ISO/DIS 28765:2022)
Emails und Emaillierungen – Gestaltung von verschraubten Stahlbehältern für die
Speicherung oder Behandlung von Wasser oder kommunalen und industriellen
Abwässern und Abwasserschlamm (ISO/DIS 28765:2022)
Émaux vitrifiés - Conception de réservoirs en acier boulonnés pour le stockage ou le
traitement des eaux ou des effluents d'eaux usées urbains ou industriels (ISO/DIS
28765:2022)
Ta slovenski standard je istoveten z: prEN ISO 28765
ICS:
23.020.10 Nepremične posode in Stationary containers and
rezervoarji tanks
25.220.50 Emajlne prevleke Enamels
oSIST prEN ISO 28765:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 28765:2022
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oSIST prEN ISO 28765:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 28765
ISO/TC 107 Secretariat: KATS
Voting begins on: Voting terminates on:
2022-01-20 2022-04-14
Vitreous and porcelain enamels — Design of bolted steel
tanks for the storage or treatment of water or municipal or
industrial effluents and sludges
Émaux vitrifiés — Conception de réservoirs en acier boulonnés pour le stockage ou le traitement des eaux
ou des effluents d'eaux usées urbains ou industriels
ICS: 25.220.50
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,
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WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 28765:2022(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 2022
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oSIST prEN ISO 28765:2022
ISO/DIS 28765:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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oSIST prEN ISO 28765:2022
ISO/DIS 28765:2022(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 3
4 Symbols and abbreviated terms.4
5 Units. 5
6 Information and requirements to be agreed and documented . 5
6.1 General . 5
6.2 Information to be provided by the purchaser . 6
6.3 Information to be provided by the designer . 6
7 Applicable standards .7
8 Loads . 7
8.1 General . 7
8.2 Contents . 7
8.2.1 General . 7
8.2.2 Freeboard . 8
8.2.3 Hydrostatic pressure . 8
8.2.4 Axial wall forces. 8
8.2.5 Filling and discharging . 8
8.3 Tank structure . 8
8.4 Roof . 9
8.5 Equipment loads . 9
8.5.1 General . 9
8.5.2 Static load . 9
8.5.3 Dynamic load . 9
8.6 Access. 9
8.7 Environmental . 9
8.7.1 General . 9
8.7.2 Seismic action. 10
8.7.3 Wind . 10
8.7.4 Snow . 10
8.7.5 Ice . 10
8.8 Ancillary items . 10
9 Design .10
9.1 General . 10
9.2 Steel . 10
9.2.1 Specification . 10
9.2.2 Effects of the enamelling process . 11
9.3 Tank . 11
9.3.1 Load factors . 11
9.3.2 Tank walls . 11
9.3.3 Tank roof . . 14
9.3.4 Attachment of walls to floor . 15
9.3.5 Tank floor . 15
9.3.6 Ancillary items . 16
9.3.7 Cathodic protection . 16
9.4 Openings . 16
9.4.1 Access manway . 16
9.4.2 Pipe connections . 16
9.4.3 Overflows . 16
9.4.4 Reinforcement of manways and pipe connections in the tank shell . 16
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oSIST prEN ISO 28765:2022
ISO/DIS 28765:2022(E)
9.4.5 Connections in the roof . 17
9.5 Effects of accidents . 17
9.5.1 Risk assessment . 17
9.5.2 Explosions . 17
9.5.3 Uncontrolled fluctuation in input stream characteristics . 18
10 Vitreous enamel coating .18
10.1 Vitreous enamel . . 18
10.2 Coating . 18
10.3 Vitreous enamel quality . 18
10.3.1 Preparation and test frequency . 18
10.3.2 Inspection . 18
10.3.3 On-site rectification . . 19
10.4 Protection during shipping . 23
10.5 Maintenance . 23
11 Installation .23
11.1 General guidance . 23
11.2 Foundations .23
11.3 Inspection of the vitreous enamel coating at the construction site .23
12 Disinfection .24
Bibliography .25
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oSIST prEN ISO 28765:2022
ISO/DIS 28765:2022(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 the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO's adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 107, Metallic and other inorganic coatings.
This second edition cancels and replaces the first edition (ISO 28765:2008), which has been technically
revised.
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oSIST prEN ISO 28765:2022
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oSIST prEN ISO 28765:2022
DRAFT INTERNATIONAL STANDARD ISO/DIS 28765:2022(E)
Vitreous and porcelain enamels — Design of bolted steel
tanks for the storage or treatment of water or municipal or
industrial effluents and sludges
1 Scope
This International Standard establishes the requirements for the design and use of vitreous enamel
coated bolted cylindrical steel tanks for the storage or treatment of water or municipal or industrial
effluents and sludges.
It applies to the design of the tank and any associated roof and gives guidance on the requirements for
the design of the foundation.
It applies where
a) the tank is cylindrical and is mounted on a load-bearing base substantially at or above ground level;
b) the product of the tank diameter in metres and the wall height in metres lies within the range
5 to 500;
c) the tank diameter does not exceed 100 m and the total wall height does not exceed 50 m;
d) the stored material has the characteristics of a liquid, exerting a negligible frictional force on the
tank wall; the stored material may be undergoing treatment as part of a municipal or industrial
effluent treatment process;
e) the internal pressure in the headspace above the liquid does not exceed 50 kPa and the internal
partial vacuum above the liquid does not exceed 10 kPa;
f) the walls of the tank are vertical;
g) the floor of the tank is substantially flat at its intersection with the wall; the floor of the tank may
have a rise or fall built in to allow complete emptying of the tank contents, the slope of which does
not exceed 1:100;
h) there is negligible inertial and impact load due to tank filling;
i) the minimum thickness of the tank shell is 1,5 mm;
j) the material used for the manufacture of the steel sheets is carbon steel (tanks constructed of sheets
made from aluminium or stainless steel are outside the scope of this International Standard);
k) the temperature of the tank wall during operation is within the range −50 °C to +100 °C under all
operating conditions.
This International Standard also gives details of procedures to be followed during installation on site
and for inspection and maintenance of the installed tank.
It does not apply to chemical-reaction vessels.
It does not cover resistance to fire.
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oSIST prEN ISO 28765:2022
ISO/DIS 28765:2022(E)
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic
method
ISO 2746:2015, Vitreous and porcelain enamels — High voltage test
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 4532, Vitreous and porcelain enamels — Determination of the resistance of enamelled articles to
impact — Pistol test
ISO 6370-2, Vitreous and porcelain enamels — Determination of the resistance to abrasion — Part 2: Loss
in mass after sub-surface abrasion
ISO 8289-1:2020, Vitreous and porcelain enamels — Low-voltage test for detecting and locating defects —
Part 1: Swab test for non-profiled surfaces
ISO 15686-1, Buildings and constructed assets — Service life planning — Part 1: General principles and
framework
ISO 28706-1:2008, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion
— Part 1: Determination of resistance to chemical corrosion by acids at room temperature
ISO 28706-2:2017, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion —
Part 2: Determination of resistance to chemical corrosion by boiling acids, boiling neutral liquids, alkaline
liquids and/or their vapours
ISO 28706-3:2017, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion —
Part 3: Determination of resistance to chemical corrosion by alkaline liquids using a hexagonal vessel or a
tetragonal glass bottleor a tetragonal glass bottle
ISO 28706-4:2016, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion
— Part 4: Determination of resistance to chemical corrosion by alkaline liquids using a cylindrical vessel
ISO 28763:2019, Vitreous and porcelain enamels — Regenerative, enamelled and packed panels for air-gas
and gas-gas heat exchangers — Specifications
ISO 19496-1, Vitreous and porcelain enamels — Terminology — Part 1: Terms and definitions
EN 15771, Vitreous and porcelain enamels — Determination of surface scratch hardness according to the
Mohs scale
EN 1993-1-6, Eurocode 3 — Design of steel structures — Part 1-6: Strength and Stability of Shell Structures
EN 1993-4-1, Eurocode 3 — Design of steel structures — Part 4-1: Silos
EN 1993-4-2, Eurocode 3 — Design of steel structures — Part 4-2: Tanks
EN 1998-4, Eurocode 8 — Design of structures for earthquake resistance — Part 4: Silos, tanks and
pipelines
EN 10209:2013, Cold rolled low carbon steel flat products for vitreous enamelling — Technical delivery
conditions
ANSI/AWWA D 103, Factory-Coated Bolted Steel Tanks for Water Storage
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oSIST prEN ISO 28765:2022
ISO/DIS 28765:2022(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 19496-1 and the following
terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/ “
3.1
brief
working document which specifies at any point in time the relevant needs and aims of the project, the
resources to be provided by the client, the details of the project and any applicable design requirements
within which all subsequent briefing (when needed) and designing can take place
3.2
client
person or organization that requires a tank to be provided, altered or extended and is responsible for
initiating and approving the brief
3.3
defect
any void, break, crack, discontinuity, blister, foreign inclusion, or contamination of the vitreous enamel
coating
3.4
designer
person or organization responsible for stating the shape and specification of the component to be
designed
3.5
design life
service life intended by the designer
3.6
Discontinuity free
any vitreous enamel coating which does not allow an electric current to pass through to the steel
substrate
3.7
enamel supplier
person or organization supplying materials for use by the vitreous enameller in the enamelling process
3.8
freeboard
distance between the top of the cylindrical-tank vertical shell wall and the surface of the contained
liquid at the specified operating level
3.9
headspace pressure
pressure within a roofed tank above the stored liquid
3.10
inspection area
area inside a boundary 25 mm from any panel edge or hole and outside a boundary 25 mm from any
opening or hole within the body of a panel
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oSIST prEN ISO 28765:2022
ISO/DIS 28765:2022(E)
3.11
liquid
bulk substance that exerts substantially the same vertical and horizontal pressures and has no fixed
shape
3.12
maintenance
combination of all technical and associated administrative actions during the service life to retain a
tank or its parts in a state in which it can perform its required function
3.13
manufacturer
person or organization that manufactures the tank or parts of the tank
3.14
purchaser
person or organization purchasing the tank from the supplier
Note 1 to entry: The purchaser can also be the client.
3.15
rectification
return of a tank or its parts to an acceptable condition by the renewal, replacement or repair of worn,
damaged or degraded parts
3.16
supplier
person or organization that supplies the tank or parts of the tank
3.17
service life
period of time after installation during which the tank or its parts meets or exceeds the performance
requirements
3.18
tank
cylindrical, vertical shell for containing liquid, with or without a roof, which is constructed from curved
vitreous enamelled single or laminated steel panels bolted together on the construction site and
mounted on a base which may also form the floor of the container
3.19
vitreous enameller
person undertaking and controlling the process of preparing the steel sheets and applying the vitreous
enamel coating to the surfaces of the steel sheets
Note 1 to entry: The vitreous enameller will normally be the manufacturer.
4 Symbols and abbreviated terms
For the purposes of this document, the following symbols and abbreviated terms apply.
D tank diameter
E Young's modulus of elasticity
F static hoop force
H
g acceleration due to gravity
H depth of liquid at point under consideration, measured from the liquid surface at the max-
imum possible filling level
H total vertical wall height
0
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oSIST prEN ISO 28765:2022
ISO/DIS 28765:2022(E)
l length of shell between intermediate stiffeners
I second moment of area of a stiffener
z
p static liquid pressure at a specified depth
n
p headspace pressure
h
r tank radius
q critical external buckling pressure
r,cr
q maximum stagnation pressure due to wind
wmax
w proportion of dissolved solids in sludge
t shell plate thickness
ν Poisson's ratio
γ partial load factor
ρ relative density of a liquid
σ stress
σ critical axial buckling resistance
z,cr
cr (subscript) critical
ds (subscript) dissolved solids
h (subscript) headspace
max (subscript) maximum value
n (subscript) normal to the tank wall
s (subscript) sludge
w
...
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