SIST EN ISO 28765:2012
(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 28765:2008)
Vitreous and porcelain enamels - Design of bolted steel tanks for the storage or treatment of water or municipal or industrial effluents and sludges (ISO 28765:2008)
ISO 28765:2008 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
1. the tank is cylindrical and is mounted on a load-bearing base substantially at or above ground level;
2. the product of the tank diameter in metres and the wall height in metres lies within the range 5 to 500;
3. the tank diameter does not exceed 100 m and the total wall height does not exceed 50 m;
4. 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;
5. 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;
6. the walls of the tank are vertical;
7. 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;
8. there is negligible inertial and impact load due to tank filling;
9. the minimum thickness of the tank shell is 1,5 mm;
10. 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);
11. 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.
...
Emails und Emaillierungen - Gestaltung von verschraubten Stahlbehältern für die Speicherung oder Behandlung von Wasser oder kommunalen und industriellen Abwässern und Abwasserschlamm (ISO 28765:2008)
Diese Internationale Norm legt die Anforderungen an Gestaltung und Gebrauch von emailbeschichteten, verschraubten,
zylindrischen Stahlbehältern für die Speicherung oder Behandlung von kommunalen oder industriellen
Abwässern und Abwasserschlamm fest.
Sie gilt für die Gestaltung des Behälters und jeglichen zugehörigen Dachs und liefert Leitlinien für die
Anforderungen an die Gestaltung des Fundamentes.
Sie gilt, wenn:
a) der Behälter zylindrisch 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 Reibung an der
Behälterwand erzeugt; der gespeicherte Stoff im Rahmen des Aufbereitungsprozesses von kommunalen
und industriellen Abwässern einer Behandlung unterzogen werden darf;
e) der Innendruck oberhalb der Flüssigkeit nicht größer als 50 kPa ist und der Innen-Unterdruck 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 darf, damit sein vollständiges Entleeren ermöglicht wird, wobei diese
Neigung nicht mehr als 1 : 100 beträgt;
h) die durch die Behälterfüllung erzeugte Trägheitskraft und Stoßbeanspruchung zu vernachlässigen sind;
i) die Mindestdicke der Behälterhülle 1,5 mm beträgt;
j) für die Herstellung der Stahlplatten Kohlenstoffstahl verwendet wird (Behälter aus Aluminium oder rostfreiem
Stahl fallen nicht in den Anwendungsbereich dieser Internationalen Norm);
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 28765:2008)
L'ISO 28765:2008 établit les exigences relatives à la conception et à l'utilisation de réservoirs cylindriques en acier boulonnés revêtus d'émail vitrifié pour le stockage et le traitement des eaux ou des effluents d'eaux usées urbains ou industriels.
Elle s'applique à la conception de réservoirs et de tout toit associé et fournit des lignes directrices concernant les exigences relatives à la conception de l'assise.
Elle s'applique lorsque:
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;
le produit du diamètre du réservoir, en mètres, et de la hauteur de paroi, en mètres, est compris entre 5 et 500;
le diamètre du réservoir ne dépasse pas 100 m, et la hauteur totale de paroi ne dépasse pas 50 m;
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;
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;
les parois du réservoir sont verticales;
le fond du réservoir est essentiellement plat à l'intersection avec la paroi; il peut présenter une inclinaison dont la pente ne doit pas dépasser 1 % afin de pouvoir vider complètement son contenu;
la charge d'impact et d'inertie est négligeable en raison du remplissage du réservoir;
l'épaisseur minimale de l'enveloppe du réservoir est de 1,5 mm;
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 n'entrent pas dans le domaine d'application de la présente Norme internationale);
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.
L'ISO 28765:2008 fournit également des informations détaillées concernant les modes opératoires à suivre durant l'installation sur site ainsi que pour le contrôle et l'entretien du réservoir installé.
Elle ne s'applique pas aux réservoirs pour réaction chimique.
Elle ne s'applique pas aux réservoirs à toit flottant.
Elle 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 28765:2008)
Ta mednarodni standard vzpostavlja zahteve za projektiranje in uporabo s steklastim emajlom zaščitenih jeklenih rezervoarjev za skladiščenje ali pripravo vode ali komunalnih ali industrijskih odplak.
Velja za projektiranje rezervoarja in povezane strehe ter podaja navodilo glede zahtev za projektiranje temeljev.
Velja tam, kjer
1. je rezervoar valjast in nameščen na nosilni osnovi, ki je na ravni tal ali nad njimi;
2. je zmnožek premera rezervoarja v metrih in višine stene v metrih v razponu med 5 in 500;
3. premer rezervoarja ne presega 100 m in skupna višina stene ne presega 50 m;
4. ima skladiščeni material značilnosti tekočine, izvaja zanemarljivo torno silo na steno rezervoarja; skladiščeni material se lahko pripravlja kot del procesa obdelave komunalnih ali industrijskih odplak;
5. notranji tlak v parni fazi nad tekočino ne presega 50 kPa in notranji delni vakuum nad tekočino ne presega 10 kPa;
6. so stene rezervoarja navpične;
7. so tla rezervoarja na sečišču s steno ravna; tla rezervoarja imajo lahko vgrajen dvig ali padec, ki omogoča popolno praznjenje vsebine rezervoarja, njegov naklon pa ne presega 1 : 100;
8. sta vztrajnostna in naletna teža zaradi polnjenja rezervoarja zanemarljivi;
9. je minimalna debelina lupine rezervoarja 1,5 mm;
10. je material, uporabljen za izdelavo jeklenih plošč, ogljikovo jeklo (rezervoarji, narejeni iz plošč iz aluminija ali nerjavnega jekla, so zunaj obsega uporabe tega mednarodnega standarda);
11. je temperatura stene rezervoarja med obratovanjem v razponu med -50 °C in +100 °C v vseh obratovalnih pogojih.
Ta mednarodni standard podaja tudi podrobnosti o postopkih, po katerih se je treba ravnati med vgradnjo na mesto ter za pregled in vzdrževanje vgrajenega rezervoarja.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 28765:2012
01-januar-2012
1DGRPHãþD
SIST EN 15282:2007
6WHNODVWLLQSRUFHODQVNLHPDMOL3URMHNWLUDQMHVVWHNODVWLPHPDMORP]DãþLWHQLK
MHNOHQLKUH]HUYRDUMHY]DVNODGLãþHQMHDOLSULSUDYRYRGHDOLNRPXQDOQLKDOL
LQGXVWULMVNLKRGSODN ,62
Vitreous and porcelain enamels - Design of bolted steel tanks for the storage or
treatment of water or municipal or industrial effluents and sludges (ISO 28765:2008)
Emails und Emaillierungen - Gestaltung von verschraubten Stahlbehältern für die
Speicherung oder Behandlung von Wasser oder kommunalen und industriellen
Abwässern und Abwasserschlamm (ISO 28765:2008)
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
28765:2008)
Ta slovenski standard je istoveten z: EN ISO 28765:2011
ICS:
23.020.10 1HSUHPLþQHSRVRGHLQ Stationary containers and
UH]HUYRDUML tanks
25.220.50 Emajlne prevleke Enamels
SIST EN ISO 28765:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 28765:2012
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SIST EN ISO 28765:2012
EUROPEAN STANDARD
EN ISO 28765
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2011
ICS 25.220.50 Supersedes EN 15282:2007
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 28765:2008)
Émaux vitrifiés - Conception de réservoirs en acier Emails und Emaillierungen - Gestaltung von verschraubten
boulonnés pour le stockage ou le traitement des eaux ou Stahlbehältern für die Speicherung oder Behandlung von
des effluents d'eaux usées urbains ou industriels (ISO Wasser oder kommunalen und industriellen Abwässern und
28765:2008) Abwasserschlamm (ISO 28765:2008)
This European Standard was approved by CEN on 3 March 2011.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 28765:2011: E
worldwide for CEN national Members.
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SIST EN ISO 28765:2012
EN ISO 28765:2011 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 28765:2012
EN ISO 28765:2011 (E)
Foreword
The text of ISO 28765:2008 has been prepared by Technical Committee ISO/TC 107 “Metallic and other
inorganic coatings” of the International Organization for Standardization (ISO) and has been taken over as
EN ISO 28765:2011 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” 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 September 2011, and conflicting national standards shall be
withdrawn at the latest by September 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15282:2007.
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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 28765:2008 has been approved by CEN as a EN ISO 28765:2011 without any modification.
3
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SIST EN ISO 28765:2012
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SIST EN ISO 28765:2012
INTERNATIONAL ISO
STANDARD 28765
First edition
2008-10-01
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 28765:2008(E)
©
ISO 2008
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SIST EN ISO 28765:2012
ISO 28765:2008(E)
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All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
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Published in Switzerland
ii © ISO 2008 – All rights reserved
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SIST EN ISO 28765:2012
ISO 28765:2008(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 2
3 Terms and definitions. 3
4 Symbols and abbreviated terms . 5
5 Units . 6
6 Information and requirements to be agreed and documented . 6
6.1 General. 6
6.2 Information to be provided by the purchaser . 6
6.3 Information to be provided by the designer .7
7 Applicable standards. 7
8 Loads. 8
8.1 General. 8
8.2 Contents . 8
8.3 Tank structure . 9
8.4 Roof. 9
8.5 Equipment loads . 10
8.6 Access . 10
8.7 Environmental . 10
8.8 Ancillary items . 11
9 Design . 11
9.1 General. 11
9.2 Steel. 11
9.3 Tank. 12
9.4 Openings . 17
9.5 Effects of accidents. 18
10 Vitreous-enamel coating . 19
10.1 Vitreous enamel . 19
10.2 Coating. 19
10.3 Vitreous-enamel quality . 19
10.4 Protection during shipping. 25
10.5 Maintenance . 25
11 Installation . 25
11.1 General guidance. 25
11.2 Foundations . 25
11.3 Inspection of the vitreous-enamel coating at the construction site. 25
12 Disinfection . 25
Bibliography . 26
© ISO 2008 – All rights reserved iii
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SIST EN ISO 28765:2012
ISO 28765:2008(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 28765 was prepared by the European Committee for Standardization (CEN) (as EN 15282) and was
adopted, under a special “fast-track procedure”, by Technical Committee ISO/TC 107, Metallic and other
inorganic coatings, in parallel with its approval by the ISO member bodies.
iv © ISO 2008 – All rights reserved
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SIST EN ISO 28765:2012
INTERNATIONAL STANDARD ISO 28765:2008(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 apply to tanks fitted with floating roofs.
It does not cover resistance to fire.
© ISO 2008 – All rights reserved 1
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SIST EN ISO 28765:2012
ISO 28765:2008(E)
2 Normative references
The following referenced documents are indispensable for the application 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 2747, Vitreous and porcelain enamels — Enamelled cooking utensils — Determination of resistance to
thermal shock
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 8289:2000, Vitreous and porcelain enamels — Low voltage test for detecting and locating defects
ISO 15686-1, Buildings and constructed assets — Service life planning — Part 1: General principles
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 28706-2:2008, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion —
Part 2: Determination of resistance to chemical corrosion by boiling acids, boiling neutral liquids and/or their
vapours
ISO 28706-3:2008, 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
ISO 28706-4:2008, 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
EN 101, Ceramic tiles — Determination of scratch hardness of surface according to Mohs
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 10209:1996, Cold rolled low carbon steel flat products for vitreous enamelling — Technical delivery
conditions
EN 14430:2004, Vitreous and porcelain enamels — High voltage test
ANSI/AWWA D 103-97, Factory-Coated Bolted Steel Tanks for Water Storage
2 © ISO 2008 – All rights reserved
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SIST EN ISO 28765:2012
ISO 28765:2008(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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
break in the surface of the vitreous enamel
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
defect area or spot that allows an electric current to pass when tested with low-voltage or high-voltage test
apparatus
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
3.11
liquid
bulk substance that exerts substantially the same vertical and horizontal pressures and has no fixed shape
© ISO 2008 – All rights reserved 3
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SIST EN ISO 28765:2012
ISO 28765:2008(E)
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 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 vitreous-
enamelled curved 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 The vitreous enameller will normally be the manufacturer.
3.20
vitreous enamel
substantially vitreous, or glassy, inorganic silica coating bonded to steel by fusion at a temperature above
750 °C
NOTE 1 This coating is applied for protective purposes to the internal liquid contact surface of the steel and for
functional and decorative purposes to the external surface of the steel.
NOTE 2 The coating is produced by a proprietary formulation of silica glass, minerals and clays to produce a medium,
dry or suspended in water, which can be sprayed on to the surface of curved steel sheets and subsequently fusion bonded.
4 © ISO 2008 – All rights reserved
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SIST EN ISO 28765:2012
ISO 28765:2008(E)
4 Symbols and abbreviated terms
For the purposes of this document, the following symbols and abbreviations 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 maximum
possible filling level
H total vertical wall height
0
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
w
max
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
(subscript) critical
cr
(subscript) dissolved solids
ds
(subscript) headspace
h
(subscript) maximum value
max
(subscript) normal to the tank wall
n
(subscript) sludge
s
(subscript) wind
w
(subscript) coincident with the central axis of a shell of revolution
z
(subscript) coincident with the radial axis of a shell of revolution
ϕ
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ISO 28765:2008(E)
5 Units
The use of one of the following sets of consistent units is recommended:
⎯ dimensions: m, mm
3 3
⎯ unit weight: kN/m , N/mm
⎯ forces and loads: kN, N
⎯ line forces and line loads: kN/m, N/mm
⎯ pressures and area-distributed actions: kPa, MPa
3 3
⎯ unit mass: kg/m , kg/mm
2 2
⎯ acceleration: km/s , m/s
⎯ membrane-stress resultants: kN/m, N/mm
⎯ bending-stress resultants: kNm/m, Nmm/mm
2
⎯ stresses and elastic moduli: kPa, MPa (1 MPa = 1 N/mm )
6 Information and requirements to be agreed and documented
6.1 General
For the safe design and manufacture of the tank and associated parts, the specification shall be agreed
between the contracting parties.
6.2 Information to be provided by the purchaser
The purchaser shall provide the supplier with a specification that shall include, but not be limited to, the
following:
a) The specification of the stored liquid, that shall include, but not be limited to, the following:
1) the name and/or a description of the liquid;
2) the relative density;
3) any relevant properties or characteristics particular to the liquid to be stored;
4) the operating-temperature range.
b) The environmental conditions, that shall include, but not be limited to, the following:
1) wind;
2) seismic action;
3) snow;
4) ice;
5) temperature ranges.
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SIST EN ISO 28765:2012
ISO 28765:2008(E)
c) The use and planned dimensions of the tank, that shall include, but not be limited to, the following:
1) the rates of fill and discharge;
2) a summary describing the purpose of the tank and its method of operation;
3) the net effects of the process on the tank or any of its components;
4) the tank dimensions.
d) The planned location of all openings in the tank shell and roof.
e) Attached equipment:
1) method of attachment;
2) dead and live loads;
3) connections.
f) The proximity of other tanks and buildings.
6.3 Information to be provided by the designer
The designer shall provide essential data concerning the design limitations of the tank, that shall include, but
not be limited to, the following:
a) the name and a description of the stored liquid or liquids;
b) the range of the relative densities of the stored liquid or liquids;
c) the limits of the environmental criteria used in the design, including, where relevant, the design wind
speed, the design operating-temperature range, the design snow load and the seismic zone and seismic
coefficients;
d) the maximum access and superimposed loads used in the design;
e) a maintenance plan conforming to the requirements of ISO 15686-1;
f) guidance concerning change of use;
g) all relevant data assumed by the designer in the design process.
7 Applicable standards
All activities specified in this International Standard shall be carried out under an appropriate quality
[1]
management system. A quality management system conforming to ISO 9001 will be deemed to satisfy this
requirement.
The designer and client shall agree, through consultation, upon the applicable standards to be used for design
purposes. Where provision is not made within this International Standard, other international or national
standards may be specified.
The applicable standards agreed upon shall include, but not be limited to, standards providing details of
parameters for the following design procedures:
a) hydrostatic loads;
b) wind loads;
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SIST EN ISO 28765:2012
ISO 28765:2008(E)
c) seismic loads;
d) access loads;
e) snow loads;
f) rain loads;
g) load factors;
h) sheet strength calculations;
i) bolt strength calculations;
j) stability calculations;
k) foundation design.
8 Loads
8.1 General
All tanks and supporting structures shall be designed on a “limit state design” basis.
8.2 Contents
8.2.1 General
Loads due to the liquid shall be calculated considering:
a) the relative density of the specified range of liquids to be stored in the tank;
b) the geometry of the tank;
c) the maximum possible depth of the liquid in the tank.
If the liquid to be stored is sludge, and unless reliable or measured data are provided, the value of the relative
density of the sludge, ρ , may be estimated by simple proportion using the followi
...
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