SIST EN 15282:2007
(Main)Vitreous and porcelain enamels - Design of bolted steel tanks for the storage or treatment of water or municipal or industrial effluents and sludges
Vitreous and porcelain enamels - Design of bolted steel tanks for the storage or treatment of water or municipal or industrial effluents and sludges
This European Standard establishes the requirement 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.
This European Standard applies to the design of the tank and any associated roof and gives guidance on the requirements for the design of the foundation.
This European Standard applies where:
a) the tank is cylindrical and symmetrical on plan and is mounted on a load-bearing base substantially at or above ground level;
b) the multiple of the tank diameter in meters and the wall height in meters has a value 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 negligible friction force in the tank wall; the stored material may be undergoing treatment as part of a municipal or industrial effluent treatment process;
e) the internal pressure 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 should 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 European Standard),
k) the temperature of the tank wall during operation is within the range - 50 °C to + 100 °C under all operating conditions.
This European Standard also gives details of procedures to be followed during site installation and for inspection and maintenance of the installed tank.
It does not appl
Emails und Emaillierungen - Gestaltung von emailbeschichteten verschraubten Stahlbehältern für die Speicherung oder Behandlung von Wasser oder kommunalen und industriellen Abwässern
4
Diese Europäische Norm legt die Anforderungen an Gestaltung und Gebrauch von emailbeschichteten, verschraubten,
zylindrischen Stahlbehältern für die Speicherung und Behandlung von kommunalen oder industriellen
Abwässern fest.
Diese Europäische Norm gilt für die Gestaltung des Behälters und aller zugehörigen Dächer und liefert Leitlinien
für die Anforderungen an die Gestaltung des Fundamentes.
Diese Europäische Norm gilt, wenn:
a) der Behälter zylindrisch und in der Ebene symmetrisch sowie 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;
Emaux vitrifiés - Conception de réservoirs en acier, boulonnés et revetus d'émail vitrifié pour le stockage ou le traitement des eaux ou des effluents d'eaux usées principales
La présente Norme européenne établit les exigences relatives a la conception et a l'utilisation de réservoirs cylindriques en acier boulonnés a revetement d'émail vitrifié pour le stockage et le traitement des effluents municipaux ou industriels.
La présente Norme européenne s'applique a la conception de réservoirs et de tout toit associé et fournit des lignes directrices concernant les exigences relatives a la conception de l'assise.
La présente Norme européenne s'applique lorsque :
a) le réservoir est cylindrique et symétrique sur le plan et est monté sur une base porteuse dont la plus grande partie se trouve au-dessus du sol ;
b) la valeur multiple, en metres, du diametre du réservoir et la hauteur du mur se situent entre 5 m et 500 m ;
c) le matériau stocké est un liquide ; il peut etre soumis a un traitement faisant partie d'un processus de traitement des effluents industriels ou municipaux ;
d) la pression interne sur le liquide doit etre comprise entre 50 kPa et -10 kPa ;
e) les parois du réservoir sont verticales ;
f) le fond du réservoir est substantiellement plat a l'intersection avec la paroi ; il peut etre incliné afin de pouvoir vider completement son contenu ; il convient que cette inclinaison ne dépasse pas un centieme du diametre du réservoir ;
g) la charge d'impact et d'inertie est négligeable en raison du remplissage du réservoir ;
h) l'épaisseur minimale de la virole du réservoir est de 1,5 mm ;
i) le matériau utilisé pour la fabrication des tôles est un acier en carbone ; (les réservoirs construits a partir de tôles en aluminium ou en acier inoxydable n'entrent pas dans le domaine d'application de la présente Norme) ;
j) la température des tôles utilisées dans la construction se situe entre - 50 °C ± 100 °C dans toutes les conditions de fonctionnement.
Steklasti in keramični emajli – Projektiranje s steklastim emajlom zaščitenih jeklenih rezervoarjev za skladiščenje ali pripravo vode ali komunalnih ali industrijskih odplak
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Emails und Emaillierungen - Gestaltung von emailbeschichteten verschraubten Stahlbehältern für die Speicherung oder Behandlung von Wasser oder kommunalen und industriellen AbwässernEmaux vitrifiés - Conception de réservoirs en acier, boulonnés et revetus d'émail vitrifié pour le stockage ou le traitement des eaux ou des effluents d'eaux usées principalesVitreous and porcelain enamels - Design of bolted steel tanks for the storage or treatment of water or municipal or industrial effluents and sludges25.220.50Emajlne prevlekeEnamels23.020.10UH]HUYRDUMLStationary containers and tanksICS:Ta slovenski standard je istoveten z:EN 15282:2007SIST EN 15282:2007en01-julij-2007SIST EN 15282:2007SLOVENSKI
STANDARD
SIST EN 15282:2007
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15282March 2007ICS 25.220.50; 23.020.10; 13.060.01 English VersionVitreous and porcelain enamels - Design of bolted steel tanksfor the storage or treatment of water or municipal or industrialeffluents and sludgesEmaux vitrifiés - Conception de réservoirs en acier,boulonnés et revêtus d'émail vitrifié pour le stockage ou letraitement des eaux ou des effluents d'eaux uséesprincipalesEmails und Emaillierungen - Gestaltung von verschraubtenStahlbehältern für die Speicherung oder Behandlung vonWasser oder kommunalen und industriellen Abwässern undAbwasserschlammThis European Standard was approved by CEN on 3 February 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15282:2007: ESIST EN 15282:2007
EN 15282:2007 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.5 4 Symbols and abbreviated terms.7 5 Units.8 6 Information and requirements to be agreed and documented.9 6.1 General.9 6.2 Information to be provided by the purchaser.9 6.3 Information to be provided by the designer.10 7 Applicable standards.10 8 Loads.11 8.1 General.11 8.2 Contents.11 8.3 Tank structure.12 8.4 Roof.12 8.5 Equipment loads.12 8.6 Access.13 8.7 Environmental.13 8.8 Ancillary items.14 9 Design.14 9.1 General.14 9.2 Steel.14 9.3 Tank.14 9.4 Openings.20 9.5 Effects of accidents.21 10 Vitreous enamel coating.21 10.1 Vitreous enamel.21 10.2 Coating.22 10.3 Vitreous enamel quality.22 10.4 Protection during shipping.27 10.5 Maintenance.27 11 Installation.27 11.1 General guidance.27 11.2 Foundations.27 11.3 Inspection of the vitreous enamel coating at the construction site.27 12 Disinfection.27 Bibliography.28
SIST EN 15282:2007
EN 15282:2007 (E) 3 Foreword This document (EN 15282:2007) has been prepared 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 2007, and conflicting national standards shall be withdrawn at the latest by September 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, 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.
SIST EN 15282:2007
EN 15282:2007 (E) 4 1 Scope This European Standard establishes the requirement 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. This European Standard applies to the design of the tank and any associated roof and gives guidance on the requirements for the design of the foundation. This European Standard applies where: a) the tank is cylindrical and symmetrical on plan and is mounted on a load-bearing base substantially at or above ground level; b) the multiple of the tank diameter in meters and the wall height in meters has a value 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 negligible friction force in the tank wall; the stored material may be undergoing treatment as part of a municipal or industrial effluent treatment process; e) the internal pressure 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 should 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 European Standard), k) the temperature of the tank wall during operation is within the range - 50 ºC to + 100 ºC under all operating conditions. This European Standard also gives details of procedures to be followed during site installation 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. 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. EN 101, Ceramic tiles — Determination of scratch hardness of surface according to Mohs SIST EN 15282:2007
EN 15282:2007 (E) 5 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 EN 14483-1:2004, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion —
Part 1: Determination of resistance to chemical corrosion by acids at room temperature EN 14483-2:2004, Vitreous and porcelain enamels — Determination of resistance to chemical corrosion —
Part 2: Determination of resistance to chemical corrosion by boiling acids, neutral liquids and/or their vapours EN 14483-3:2004, 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 EN 14483-4:2004, 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 ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic method (ISO 2178:1982) EN ISO 8289:2001, Vitreous and porcelain enamels — Low voltage test for detecting and locating defects (ISO 8289:2000) 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 resistance to abrasion — Part 2: Loss in mass after sub-surface abrasion ISO 15686-1, Building and constructed assets — Service life planning — Part 1: General principles ANSI/AWWA D103-97, Factory-Coated Bolted Steel Tanks for Water Storage 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, 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 SIST EN 15282:2007
EN 15282:2007 (E) 6 3.2 client person or organisation 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 organisation responsible for stating the form 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 the low voltage or high voltage test apparatus used in accordance with 10.3.2.2 3.7 enamel supplier person or organisation 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 the panel 3.11 liquid bulk substance that exerts substantially the same vertical and horizontal pressures and has no fixed form 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 organisation that manufactures the tank or parts of the tank 3.14 purchaser person or organisation purchasing the tank from the supplier NOTE The purchaser can also be the client. SIST EN 15282:2007
EN 15282:2007 (E) 7 3.15 rectification return of a tank or its parts to an acceptable condition by the renewal, replacement or mending of worn, damaged or degraded parts 3.16 supplier person or organisation 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 sheet 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 ºC 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 This coating is produced by the proprietary formulation of silica glass, minerals and clays to produce a sprayable medium, dry or suspended in water on to the surface of curved steel sheets and its subsequent fusion bonding. 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 FH Static hoop force g Acceleration due to gravity H Depth of liquid at point under consideration measured from the liquid surface at the maximum possible filling level H0 Total vertical wall height l Length of shell between intermediate stiffeners Iz Second moment of area of a stiffener pn Static liquid pressure at a specified depth ph Headspace pressure SIST EN 15282:2007
EN 15282:2007 (E) 8 r Tank radius qr,cr Critical external buckling pressure qw max Maximum stagnation pressure due to wind w Proportion of dissolved solids in sludge t Shell plate thickness
Poisson's ratio
Partial load factor
Relative density of a liquid 1 Stress 1z,cr Critical axial buckling resistance 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 (subscript) Wind
z (subscript) Coincident with the central axis of a shell of revolution 3 (subscript) Coincident with the radial axis of a shell of revolution 5 Units The use of one of the following sets of consistent units is recommended: dimensions: m,
mm unit weight: kN/m3,
N/mm3 forces and loads: kN,
N line forces and line loads: kN/m,
N/mm pressures and area distributed actions: kPa,
MPa unit mass: kg/m3,
kg/mm3 acceleration: km/s2,
m/s2 membrane stress resultants: kN/m,
N/mm bending stress resultants: kNm/m,
Nmm/mm stresses and elastic moduli:
kPa,
MPa
(1 MPa = 1 N/mm2) SIST EN 15282:2007
EN 15282:2007 (E) 9 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 by the contracting parties. 6.2 Information to be provided by the purchaser The purchaser shall provide specification data to the supplier that shall include, but is not limited to the following. a) Specification of the stored liquid that shall include, but not be limited to: 1) name and/or description; 2) relative density; 3) any relevant properties or characteristics particular to the liquid to be stored; 4) operating temperature range. b) Environmental conditions that shall include, but not be limited to: 1) wind; 2) seismic; 3) snow; 4) ice; 5) temperature range. c) The usage and planned dimensions of the tank that shall include, but not be limited to: 1) the rate of fill and discharge; 2) a summary describing the function and method of the process; 3) the net effects of the process on the tank or any of its components. d) The planned location of all openings into the tank shell and roof. e) Attached equipment: 1) method of attachment; 2) dead and live loads; 3) connections. f) Proximity of other tanks and buildings. SIST EN 15282:2007
EN 15282:2007 (E) 10 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 description of the stored liquid or liquids; b) the range of values of relative density 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 used in the design process. 7 Applicable standards All activities specified in this European Standard shall be carried out under an appropriate quality management system. A quality management system conforming to EN ISO 9001 [1] will be deemed to satisfy the requirements. The designer and client shall agree through consultation upon the applicable standards to be used for design.
Where provision is not made within this European Standard, other European Standards 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; 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. SIST EN 15282:2007
EN 15282:2007 (E) 11 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 defined 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 is provided, the value of the relative density of the sludge, s, may be estimated by simple proportion using the following equation: ()11−+=dssρρw (1) where ds is taken as 1,9 in the case of municipal sewage sludge. 8.2.2 Freeboard The freeboard used for design shall be as agreed between the client and the designer. Where the tank is designed for seismic conditions sufficient freeboard shall be provided to contain the sloshing wave determined in accordance with EN 1998-4. This shall account for equipment or structural members in the top of the tank. 8.2.3 Hydrostatic pressure Determine the hydrostatic pressure, pn, in kPa, acting on the tank shell at depth H using the following equation: hnpgHp+××=ρ (2) 8.2.4 Axial wall forces Axial wall forces per unit shell width shall be determined taking account of the following: a) tank dead weight; b) imposed load; c) axial tension and compression due to wind overturning moment; d) axial tension and compression due to seismic actions. SIST EN 15282:2007
EN 15282:2007 (E) 12 8.2.5 Filling and discharging The method of filling and discharging the liquid can affect the load and shall be considered by the designer.
These influences include but are not limited to the following: a) filling position - inlet stream impinging on the tank wall; b) completion of discharge - risk of hydrodynamic ‘water hammer’ effect if outlet is closed rapidly; c) fatigue - the effect of the frequency of filling and discharge cycles; d) pressure and/or partial vacuum; e) venting; f) rapid changes in temperature. 8.3 Tank structure Dead load shall be determined as the total weight of all structural components and permanent fittings. 8.4 Roof The tank designer shall take account of all forces on the tank shell from the roof. These forces may include, but may not be limited to: a) distributed in-plane and radial forces transmitted by structural roof members; b) concentrated in-plane and radial forces resulting from structural features of the roof; c) asymmetrical forces due to uneven distribution of imposed roof loads; d) forces induced in the roof by differential settlement of the foundation. 8.5 Equipment loads 8.5.1 General In the calculation of the total load on the tank the designer shall take into account the effect of the attached equipment for both static and dynamic loads. 8.5.2 Static load The static load of any equipment attached to the tanks shall be determined as the weight of the equipment, including associated mounting fixtures and any liquid within the equipment as advised by the purchaser. 8.5.3 Dynamic load The dynamic forces of any equipment shall be determined where applicable, which may include but are not limited to: a) starting and operating forces from any rotating or moving piece of equipment mounted on the tank; b) forces imposed on the tank or attachments from installed process equipment (e.g. forces from restraining cables of floating aerators); SIST EN 15282:2007
EN 15282:2007 (E) 13 c) forces imposed on the tank or attachments due to the operation of installed process equipment (e.g. forces on attached baffle plates due to forced movement of the tank contents). 8.6 Access Loads due to access equipment such as walkways and platforms shall be determined taking account of the type of access required. a) Where access is for cleaning and repair only, the superimposed load shall be taken as not less than 0,75 kN/m2. b) Where access is required for operational procedures, the superimposed load shall be taken as not less than 3,0 kN/m2. Where a roof is fitted with hand-railing, the area within the hand-railing shall be considered as accessible. 8.7 Environmental 8.7.1 General Environmental loads shall be determined taking into account the design life of the tank. 8.7.2 Seismic Where relevant, seismic action shall be determined from the applicable standard. The designer shall consider the following as a minimum requirement: a) horizontal acceleration; b) vertical acceleration; c) sloshing of the contents; d) anchorage method; e) dynamic ground response. NOTE Guidance on the determination of seismic actions can be found in the International Building Code, ANSI/AWWA D103-97 and EN 1998-1 and EN 1998-4.
When applying ANSI/AWWA D103-97 in locations outside North America, zones determined from the Uniform Building Code 1997 may be taken as equivalent.
For the purposes of this European Standard, the loads determined according to ANSI/AWWA D103-97 may be considered as characteristic loads. 8.7.3 Wind The wind speed and pressure to be used for design shall be determined from the applicable standard for the site location. 8.7.4 Snow Where applicable the load induced by snow shall be determined from the applicable standard for the site location. 8.7.5 Ice Where applicable, the load induced by ice on roofs shall be determined from the applicable standard for the site location. SIST EN 15282:2007
EN 15282:2007 (E) 14 8.8 Ancillary items The designer shall take account of the forces from ancillary items such as ladders, platforms, valves, machinery etc. 9 Design 9.1 General The design of the tank shall be carried out using a Limit State Design approach.
Design life assessment shall be based on ISO 15686-1. 9.2 Steel 9.2.1 Specification The steel used shall have a specification as agreed between the manufacturer, the designer and the steel supplier having due regard to the requirement of the enamelling process. NOTE Steels conforming to the requirements of EN 10111 [2] and EN 10149-1 [3], (including grades DD 11, S235, S420 and S460) and ASTM A1011 [4] and other standards can be used successfully for vitreous enamelling with appropriate pre-treatments. 9.2.2 Effects of the enamelling process The designer shall take account of the effects of the vitreous enamelling process on the strength properties of the steel, and shall make details of such effects available to the client on request. The effect of the enamelling process shall be assessed and monitored over a period of time using a regular and documented testing regime from which steel strength properties can be predicted with a 95 % confidence level. Where regular and documented testing is not carried out, the yield and tensile strengths of the enamelled steel used for design purposes shall be reduced by 30 % from the guaranteed minimum strengths confirmed by the steel manufacturer. 9.3 Tank 9.3.1 Load factors Load factors used in design shall be taken from Table 1. SIST EN 15282:2007
EN 15282:2007 (E) 15 Table 1 — Load factors Basic load case Maximum load factor
Dead load 1,4 Liquid load 1,4 Imposed load 1,6 Wind load 1,4 Seismic load a 1,4 Wind load acting with seismic load and liquid load combined 1,2 Seismic load acting with wind and liquid load combined a 1,2 Stability 1,7 Any load when the action is beneficial
to the load case being considered 1,0 a Seismic actions need not be considered to act under test conditions.
9.3.2 Tank walls 9.3.2.1 General design The walls of the tank shall be designed to resist th
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