Workshop fabricated steel tanks - Part 1: Horizontal cylindrical single skin and double skin tanks for the underground storage of flammable and nonflammable water polluting liquids other than for heating and cooling of buildings

This document specifies the product characteristics and test methods for workshop fabricated cylindrical,
horizontal steel tanks, single (type S) and double skin (type D) intended to be used for the underground
storage of water polluting liquids (both flammable and non-flammable) and installed in industrial processes
or in petrol stations at normal ambient temperature conditions (−20 °C to +50 °C) within the following
limits:
— from 800 mm up to 3 000 mm nominal diameter and;
— up to a maximum overall length of 6 times the nominal diameter;
— with an operating pressure (Po) of maximum 50 kPa (0,5 bar(g)) and minimum – 5 kPa (–50 mbar(g))
and;
— for double skin tanks with a vacuum leak detection system where the kinematic viscosity does not
exceed 5 × 10−3 m2/s.
Tanks designed to this standard allow for an earth cover of up to 1,5 m. If there are imposed traffic loads or a
greater earth cover, calculation is expected to be carried out.
This document is not applicable to tanks used for storage and/or supply of fuel/gas for building
heating/cooling systems, and of hot or cold water not intended for human consumption, nor to loads and
special measures necessary in areas subject to risk of earthquakes.
Guidance on installation of tanks is presented in Annex A, which does not include special measures that
might be necessary in areas subject to flooding.
This document is not applicable for the storage of liquids having dangerous goods classes listed in Table 1
because of the special dangers involved.

Werksgefertigte Tanks aus Stahl - Teil 1: Liegende zylindrische ein- und doppelwandige Tanks zur unterirdischen Lagerung von brennbaren und nicht brennbaren wassergefährdenden Flüssigkeiten

Diese Europäische Norm legt die Produkteigenschaften sowie Prüfverfahren für werksgefertigte zylindrische, liegende, einwandige (Typ S) und doppelwandige (Typ D) Stahltanks zur unterirdischen Lagerung (brennbarer und nichtbrennbarer) wassergefährdender Flüssigkeiten, die bei üblichen Umgebungstemperaturbedingungen (−20 °C bis +50 °C) in industriellen Prozessen oder Tankstellen installiert sind, mit folgenden Anwendungsgrenzen fest:
-   Nenndurchmesser von 800 mm bis 3 000 mm; und
-   maximale Gesamtlänge bis zum 6 fachen des Nenndurchmessers;
-   Betriebsduck (Po) von höchstens 50 kPa (0,5 bar(g)) und mindestens −5 kPa (−50 mbar(g)); und
-   für doppelwandige Tanks mit einem Vakuum-Leckanzeigesystem, bei denen die kinematische Viskosität des Lagermediums 5 × 10−3 m2/s nicht übersteigt.
Tanks, die nach dieser Norm ausgelegt wurden, ermöglichen eine Erdüberdeckung von bis zu 1,5 m. Wenn eine Verkehrsbelastung auf der Oberfläche oder eine größere Erdüberdeckung vorliegen, sollte eine Berechnung durchgeführt werden.
Diese Norm gilt weder für Tanks, welche eingesetzt werden für die Lagerung und/oder Bereitstellung von Kraftstoffen für Heiz /Kühlanlagen von Gebäuden sowie von heißem oder kaltem Wasser, das nicht für den menschlichen Gebrauch bestimmt ist, noch für Lasten und spezielle Maßnahmen, die in erdbeben-gefährdeten Gebieten erforderlich sind.
Hinweise zum Einbau der Tanks sind in Anhang A angegeben, der allerdings keine speziellen Maßnahmen enthält, die in Überschwemmungsgebieten notwendig sein könnten.
Diese Norm ist nicht für die Lagerung von Flüssigkeiten anwendbar, welche unter die in Tabelle 1 aufgeführten Gefahrgutklassen fallen, da von ihnen besondere Gefahren ausgehen.
(...)
ANMERKUNG   Die genannten Klassifizierungen entsprechen den durch den Fachausschuss der Vereinten Nationen über den Transport gefährlicher Güter verabschiedeten Klassen (nicht zu verwechseln mit den Tankklassen nach 6.2).

Réservoirs en acier fabriqués en atelier - Partie 1 : Réservoirs horizontaux cylindriques à simple et double paroi pour le stockage enterré de liquides inflammables et non inflammables polluant l'eau en dehors du chauffage et du refroidissement des bâtiments

La présente Norme européenne définit les caractéristiques du produit et les méthodes d'essai pour les réservoirs en acier horizontaux cylindriques, fabriqués en atelier, à simple (type S) et double paroi (type D), destinés à être utilisés pour le stockage enterré de liquides polluant l'eau (inflammables et non inflammables) et installés dans des procédés industriels ou dans des stations-service dans des conditions normales de températures ambiantes (−20 °C à +50 °C), et compris dans les limites suivantes :
-   diamètre nominal compris entre 800 mm et 3 000 mm ;
-   longueur maximale d'encombrement égale à 6 fois le diamètre nominal ;
-   avec une pression de service (Po) maximale de 50 kPa (0,5 bar(g)) et une pression de service minimale de – 5 kPa (– 50 mbar(g)) ; et
-   pour des réservoirs à double paroi munis d'un système de détection de fuites du vide, la viscosité ne doit pas être supérieure à 5 × 10−3 m2/s.
Les réservoirs conçus conformément à la présente norme supportent une hauteur de remblai de 1,5 m. En cas de charges induites par la circulation ou de hauteur de remblai plus élevée, un calcul est nécessaire.
La présente norme ne s'applique pas aux réservoirs utilisés pour le stockage et/ou l'alimentation en combustible/gaz des systèmes de chauffage/refroidissement des bâtiments, et en eau chaude ou froide non destinée à la consommation humaine, ni aux charges et mesures spéciales nécessaires dans les zones exposées à un risque sismique.
Des lignes directrices concernant l'installation des réservoirs sont données à l'Annexe A, qui ne contient pas de mesures spéciales pouvant s'avérer nécessaires dans les zones exposées aux inondations.
La présente norme ne s'applique pas au stockage de liquides relevant des classes de matières dangereuses énumérées au Tableau 1, en raison des dangers spécifiques pouvant être engendrés.
(...)
NOTE   Les classifications données en référence sont celles adoptées par le Comité d'experts des Nations Unies pour le Transport des Matières dangereuses (elles ne doivent pas être interprétées comme les classes de réservoirs décrites au 6.2).

V delavnici izdelani rezervoarji iz jekla - 1. del: Ležeči enoplaščni in dvoplaščni valjasti rezervoarji za podzemno skladiščenje vnetljivih in nevnetljivih tekočin, ki onesnažujejo vodo in ki se ne uporabljajo za ogrevanje in hlajenje stavb

Ta dokument določa lastnosti izdelka in preskusne metode za v delavnici izdelane valjaste, ležeče enoplaščne (tip S) ter dvoplaščne (tip D) rezervoarje iz jekla za podzemno skladiščenje vnetljivih in nevnetljivih tekočin, ki onesnažujejo vodo, ki so nameščeni v industrijskih obratih ali na bencinskih črpalkah pri običajnih temperaturah okolja (od –20 °C do 50 °C) z naslednjimi omejitvami:
– nazivni premer od 800 mm do 3000 mm;
– do največje skupne dolžine, ki je enaka 6-kratnemu nazivnemu premeru;
– z obratovalnim tlakom (Po) največ 50 kPa (0,5 bara (g)) in najmanj 5 kPa (–50 milibarov (g));
– za dvoplaščne rezervoarje z vakuumskim sistemom za kontrolo tesnosti, pri čemer kinematična viskoznost ne presega vrednosti 5×10–3 m2/s.
Rezervoarji, izdelani po tem standardu, omogočajo zasutje do 1,5 m. V primeru predvidenih prometnih obremenitev ali večje prekritosti z zemljo je treba opraviti izračun.
Ta dokument se ne uporablja za rezervoarje, ki se uporabljajo za skladiščenje in/ali oskrbo z gorivom ali s plinom za ogrevalne/hladilne sisteme v zgradbah in z vročo/hladno vodo, ki ni namenjena za pitje, ter za obremenitve in posebne ukrepe, zahtevane na potresno izpostavljenih območjih.
Navodila za namestitev rezervoarjev so podana v dodatku A, ki ne vključuje posebnih ukrepov,
ki so morda zahtevani na poplavam izpostavljenih območjih.
Ta dokument se zaradi posebnih nevarnosti ne uporablja za skladiščenje tekočin z razredi nevarnega blaga, navedenimi v preglednici 1.

General Information

Status
Published
Public Enquiry End Date
09-Oct-2016
Publication Date
17-Oct-2018
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
04-Oct-2018
Due Date
09-Dec-2018
Completion Date
18-Oct-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Werksgefertigte Tanks aus Stahl - Teil 1: Liegende zylindrische ein- und doppelwandige Tanks zur unterirdischen Lagerung von brennbaren und nicht brennbaren wassergefährdenden FlüssigkeitenRéservoirs en acier fabriqués en atelier - Partie 1 : Réservoirs horizontaux cylindriques à simple et double paroi pour le stockage enterré de liquides inflammables et non inflammables polluant l'eau en dehors du chauffage et du refroidissement des bâtimentsWorkshop fabricated steel tanks - Part 1: Horizontal cylindrical single skin and double skin tanks for the underground storage of flammable and nonflammable water polluting liquids other than for heating and cooling of buildings23.020.10UH]HUYRDUMLStationary containers and tanks13.300Varstvo pred nevarnimi izdelkiProtection against dangerous goodsICS:Ta slovenski standard je istoveten z:EN 12285-1:2018SIST EN 12285-1:2018en,fr,de01-november-2018SIST EN 12285-1:2018SLOVENSKI

STANDARDSIST EN 12285-1:20031DGRPHãþD
SIST EN 12285-1:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12285-1
July
t r s z ICS
s uä u r râ
t uä r t rä s r Supersedes EN
s t t z wæ sã t r r uEnglish Version
Workshop fabricated steel tanks æ Part

sã Horizontal cylindrical single skin and double skin tanks for the underground storage of flammable and nonflammable water polluting liquids other than for heating and cooling of buildings Réservoirs en acier fabriqués en atelier æ Partie

s ã Réservoirs horizontaux cylindriques à simple ou double paroi pour le stockage enterré de liquides inflammables et non inflammables polluant l 5eau en dehors du chauffage et du refroidissement des bâtiments

Werksgefertigte Tanks aus Stahl æ Teil

sã Liegendeá zylindrischeá einæ und doppelwandige Tanks zur unterirdischen Lagerung von brennbaren und nicht brennbaren wassergefährdenden Flüssigkeitená die nicht für das Heizen und Kühlen von Gebäuden vorgesehen sind This European Standard was approved by CEN on

s w February
t r s zä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels

t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

s t t z wæ sã t r s z ESIST EN 12285-1:2018

EN 12285-1:2018 (E) 2 Contents Page European foreword ....................................................................................................................................................... 4 1 Scope .................................................................................................................................................................... 5 2 Normative references .................................................................................................................................... 6 3 Terms, definitions, symbols and abbreviations ................................................................................... 6 3.1 Terms and definitions ................................................................................................................................... 6 3.2 Symbols and abbreviations ......................................................................................................................... 8 4 Product characteristics ................................................................................................................................. 9 4.1 General ................................................................................................................................................................ 9 4.2 Welding ............................................................................................................................................................... 9 4.2.1 Types of joints .................................................................................................................................................. 9 4.2.2 Shell plate arrangement ............................................................................................................................ 12 4.2.3 Consumables .................................................................................................................................................. 12 4.2.4 Interstitial space ........................................................................................................................................... 12 4.3 Load bearing capacity ................................................................................................................................. 12 4.4 Additional requirements ........................................................................................................................... 12 4.4.1 Manways and inspection covers ............................................................................................................. 12 4.4.2 Structural bolts ............................................................................................................................................. 13 4.4.3 Tank fittings, pipes and nozzles .............................................................................................................. 13 4.4.4 Lifting lugs ...................................................................................................................................................... 14 4.5 Mechanical resistance and stability ...................................................................................................... 15 4.5.1 Materials for shell, dished ends and manways .................................................................................. 15 4.5.2 Wall thickness ............................................................................................................................................... 15 4.5.3 Stiffening resistance .................................................................................................................................... 17 4.5.4 Design of Stiffening Rings .......................................................................................................................... 18 4.6 Internal pressure ......................................................................................................................................... 19 4.7 Tightness (gas and liquid)......................................................................................................................... 19 4.8 Release of dangerous substances ........................................................................................................... 19 4.9 Durability ........................................................................................................................................................ 19 4.10 Crushing resistance ..................................................................................................................................... 20 5 Testing and sampling methods ............................................................................................................... 20 5.1 Mechanical resistance and stability ...................................................................................................... 20 5.1.1 Materials for shell, dished ends and manways .................................................................................. 20 5.1.2 Wall thickness ............................................................................................................................................... 20 5.1.3 Welding ............................................................................................................................................................ 20 5.1.4 Stiffening resistance .................................................................................................................................... 20 5.2 Load-bearing capacity ................................................................................................................................ 20 5.3 Tightness test (gas or liquid) ................................................................................................................... 21 5.4 Crushing resistance ..................................................................................................................................... 21 5.5 Testing of additional requirements....................................................................................................... 21 5.5.1 Manways and inspection covers ............................................................................................................. 21 5.5.2 Structural bolts ............................................................................................................................................. 21 5.5.3 Tank fittings, pipes and nozzles .............................................................................................................. 21 5.5.4 Lifting lugs ...................................................................................................................................................... 21 5.6 Durability ........................................................................................................................................................ 22 SIST EN 12285-1:2018

EN 12285-1:2018 (E) 3 6 Classification .................................................................................................................................................. 22 6.1 Tank type ......................................................................................................................................................... 22 6.2 Tank classes .................................................................................................................................................... 22 6.3 Designation and purchaser's specification ......................................................................................... 22 7 Marking and labelling ................................................................................................................................. 23 7.1 Marking of the tank ...................................................................................................................................... 23 7.2 Documentation .............................................................................................................................................. 23 8 Environmental aspects ............................................................................................................................... 23 Annex A (informative)

Transport, storage and installation procedure ................................................... 24 A.1 Transport ......................................................................................................................................................... 24 A.2 Storage .............................................................................................................................................................. 24 A.3 Installation procedure ................................................................................................................................ 24 A.3.1 Planning ........................................................................................................................................................... 24 A.3.2 Ground works ................................................................................................................................................ 24 A.3.3 Backfill materials .......................................................................................................................................... 25 A.3.4 Installing backfill .......................................................................................................................................... 25 A.3.5 Access chamber ............................................................................................................................................. 26 Annex B (informative)

Evaluation of liquid-material-combinations for storage tanks according to this standard .................................................................................................................................................. 27 B.1 General ............................................................................................................................................................. 27 B.2 Criteria for evaluation ................................................................................................................................ 27 B.2.1 Conditions for resistance ........................................................................................................................... 27 B.2.2 Criteria for the suitability evaluation of liquid-material-combinations .................................. 29 B.3 Evaluation of liquids not mentioned in the positive-liquid-list ................................................... 29 B.4 Use of the positive-liquid-list ................................................................................................................... 29 B.4.1 Classification of the tanks according to their working conditions ............................................. 29 B.4.2 Conditions for the use of the liquids ...................................................................................................... 30 Annex C (informative)

Environmental aspects .............................................................................................. 114 Annex D (informative)

A-deviations .................................................................................................................. 117 Bibliography .............................................................................................................................................................. 119

SIST EN 12285-1:2018

EN 12285-1:2018 (E) 4 European foreword This document (EN 12285-1:2018) has been prepared by Technical Committee CEN/TC 265 “Metallic tanks for the storage of liquids”, 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 January 2019, and conflicting national standards shall be withdrawn at the latest by April 2020. 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, together with prEN 12285-3:2016, supersedes EN 12285-1:2003. Compared to EN 12285-1:2003, this document has been revised as follows: — exclusion of tanks covered by the Mandate M/131; — old Clause 3, Terms and definitions has been combined with old Clause 4, Symbols and abbreviations; — old Clause 5, Designation and purchaser's specification has been combined with new Clause 7, Classification and designation; — old Clause 6, Materials, Clause 7, Design, Clause 8, Fabrication and Clause 10, Handling and installation have been replaced by new Clause 4, Product characteristics; — old Clause 9, Testing has now become Clause 5, Testing, assessment and sampling methods; — old Clause 11, Marking of the tank and manufacturer's statement has now been combined with new Clause 8, Marking, labelling and packaging. The informative Annexes A and B give further guidance: A on transport, storage and installation procedures and B on the liquid-material combinations to be chosen. Annex C provides guidance on environmental aspects. This European Standard Workshop fabricated steel tanks consists of 3 parts: — Part 1: Horizontal cylindrical single skin and double skin tanks for the underground storage of flammable and nonflammable water polluting liquids other than for heating and cooling of buildings; — Part 2: Horizontal cylindrical single skin and double skin tanks for the aboveground storage of flammable and non-flammable water polluting liquids; — Part 3: Horizontal cylindrical single skin and double skin tanks for the underground storage of flammable and nonflammable water polluting liquids for heating and cooling of buildings. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 12285-1:2018

EN 12285-1:2018 (E) 5 1 Scope This document specifies the product characteristics and test methods for workshop fabricated cylindrical, horizontal steel tanks, single (type S) and double skin (type D) intended to be used for the underground storage of water polluting liquids (both flammable and non-flammable) and installed in industrial processes or in petrol stations at normal ambient temperature conditions ( «20 °C to +50 °C) within the following limits: — from 800 mm up to 3 000 mm nominal diameter and; — up to a maximum overall length of 6 times the nominal diameter; — with an operating pressure (Po) of maximum 50 kPa (0,5 bar(g)) and minimum – 5 kPa (–50 mbar(g)) and; — for double skin tanks with a vacuum leak detection system where the kinematic viscosity does not exceed 5 × 10 «3 m2/s. Tanks designed to this standard allow for an earth cover of up to 1,5 m. If there are imposed traffic loads or a greater earth cover, calculation is expected to be carried out. This document is not applicable to tanks used for storage and/or supply of fuel/gas for building heating/cooling systems, and of hot or cold water not intended for human consumption, nor to loads and special measures necessary in areas subject to risk of earthquakes. Guidance on installation of tanks is presented in Annex A, which does not include special measures that might be necessary in areas subject to flooding. This document is not applicable for the storage of liquids having dangerous goods classes listed in Table 1 because of the special dangers involved. Table 1 — List of dangerous goods which are not covered by this standard UN-classification Type of dangerous goods Class 1 Explosives Class 4.2 Substances liable to spontaneous combustion Class 4.3 Substances which in contact with water emit flammable gases Class 5.2 Organic peroxides Class 6.2 Infectious substances Class 7 Radioactive substances, hydrocyanic or hydrocyanic solvent liquids, metal carbons, hydrofluoric acid, bromide liquids NOTE The classifications referred to are those adopted by the United Nations Committee of Experts on the Transport of Dangerous Goods (not to be interpreted as tank classes described in 6.2). SIST EN 12285-1:2018

EN 12285-1:2018 (E) 6 2 Normative 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. EN 10025-2:2004, Hot rolled products of structural steels – Part 2: Technical delivery conditions for non-alloy structural steels EN 10204:2004, Metallic products - Types of inspection documents EN 13160-1, Leak detection systems – Part 1: General Principles EN 13160-2, Leak detection systems – Part 2: Requirements and test/assessment methods for pressure and vacuum systems EN 13160-3, Leak detection systems – Part 3: Requirements and test/assessment methods for liquid systems for tanks EN 22768 (all parts), General tolerances (ISO 2768 series) EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1: Bolts, screws and studs with specified property classes - Coarse thread and fine pitch thread (ISO 898-1) EN ISO 12944-7, Paints and varnishes - Corrosion protection of steel structures by protective paint systems – Part 7: Execution and supervision of paint work (ISO 12944-7) EN ISO 13920, Welding - General tolerances for welded constructions - Dimensions for lengths and angles - Shape and position (ISO 13920) 3 Terms, definitions, symbols and abbreviations 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses:

IEC Electropedia: available at http://www.electropedia.org/
ISO Online browsing platform: available at http://www.iso.org/obp

3.1.1 tank workshop fabricated cylindrical containment for the storage of liquids Note 1 to entry: Tanks are made of steel plates, equipped with dished ends and consist of one or more compartments. 3.1.2 underground tank tank which is totally or partially imbedded in the ground SIST EN 12285-1:2018

EN 12285-1:2018 (E) 7 3.1.3 compartment single fluid storage space within a tank 3.1.4 explosion pressure shockproof tank tank which is designed to withstand an internal explosion without leakage Note 1 to entry: Permanent deformations are permissible. 3.1.5 single skin tank impermeable containment consisting of a self contained/ self supported tank of single containment Note 1 to entry: A single skin tank also constitutes the inner skin of a double skin tank. Note 2 to entry: See Figure 1.

Tank type S (single skin) Tank type D (double skin)

Key 1 for manway detail see Figure 3 2 for example for stiffening ring see Figure 4 3 lifting lug Figure 1 — Example of tank symbols 3.1.6 double skin tank impermeable self contained tank with outer skin welded around the inner tank Note 1 to entry: See Figure 1. SIST EN 12285-1:2018

EN 12285-1:2018 (E) 8 3.1.7 operating pressure po pressure bar(g) inside the tank above the liquid during operating conditions 3.1.8 prototype tank test pressure pt1 pressure bar(g) to which the tank or compartment is subjected for testing 3.1.9 prototype interstitial space test pressure pt2 pressure bar(g) to which the interstitial space between the skins is subjected for testing Note 1 to entry: Only applicable for double skin tanks. 3.1.10 tank leak tightness test pressure pt3 pressure bar(g) to which the tank or compartment is subjected to leak testing 3.1.11 interstitial space leak tight test pressure pt4 pressure bar(g) to which the interstitial space is subjected to leak testing 3.1.12 nominal volume storage capacity for which the tank is designed 3.1.13 actual volume volume which is equal to or greater than the nominal volume 3.2 Symbols and abbreviations For the purpose of this standard the following symbols apply. Dimensions in millimetres a dimension for welding (See Figure 2) d1 external nominal diameter of the tank d2 internal diameter of the manway d3 diameter of the manway cover and corresponding flange h1 length of the straight flange of the dished end Kp pitch circle diameter of manway bolts lc length of the compartment of a tank without dished ends NOTE 1 For a single compartment tank Lc = Lz SIST EN 12285-1:2018

EN 12285-1:2018 (E) 9 lo overall length of the tank lz length of the tank without dished ends NOTE 2 For a single compartment tank Lc = Lz pt test pressure pt1 test pressure for prototype test of tank pt2 test pressure of prototype test of interstitial space pt3 test pressure of leak tightness test of tank pt4 test pressure of leak tightness test of interstitial space r1 crown radius of dished ends r2 knuckle radius of dished ends s1 nominal thickness of shell (single walled tank) and inner shell (double walled tank) s2 interstitial space s3 nominal thickness of outer shell s4 nominal thickness of outer dished ends s5 nominal thickness of compartment dished ends s6 nominal thickness of manway flange and cover s7 plate thickness of manway body s8 nominal thickness of inner dished ends

incline angle for T-joint welding 4 Product characteristics 4.1 General The tank material shall be suitable for long term contact with the stored media. Guidelines on material specifications in relation to stored media are provided in Annex B. The safe working capacity of the tank should usually not exceed 97 % of the nominal volume at normal operating temperatures. 4.2 Welding 4.2.1 Types of joints The welding related to the different types of joints is given in Table 2. The types of welded joints shall be in accordance with Table 2. SIST EN 12285-1:2018

EN 12285-1:2018 (E) 10 Table 2 — Types of welded joints Number Types of joints Applicable welding class of tanks and liquid (liquid touched wall) 1 Square butt joint

Plate misalignment shall not exceed 0,3 s1 respectively 0,3 s3 or 2 mm For all classes 2a Joggled butt joint

For class A and hydrocarbon liquids For double and single skin tanks Not permissible with inner coating 2b Joggled butt joint

For class A, B and C 3a Overlap joint
For class A, B and C For outer skin a = 0,7 s3 3b Overlap joint

For class A, B and C For outer skin on outer dished end a = 0,7 s3 4 Fillet weld in T-joint

For class A, B and C For nozzles in the outer skin a = 0,7 smin smin: thickness of the thinner plate 5 Fillet weld (full penetration) in T-joint

For class A, B and C For manways, nozzles and inspection covers
= 45° SIST EN 12285-1:2018
EN 12285-1:2018 (E) 11 6 Double fillet weld in T-joint

For class A, B and C For manways, nozzles and stiffening rings a = 0,7 smin smin = thickness of the thinner plate 7a Fillet weld in overlap joint

For class A, B and C For compartment dished ends with knuckle radius 7b Fillet weld in overlap joint

For class A, B and C For compartment dished ends with knuckle radius Not permissible with inner coating 8 Butt joint

For class A and B For compartment dished ends with knuckle radius Not permissible with inner coating 9 Double fillet weld in T-joint

For class A and B For compartment dished ends without knuckle radius a = 0,7 s5 10 Corner and fillet weld

For class A and B For set-on manways and nozzles SIST EN 12285-1:2018

EN 12285-1:2018 (E) 12 4.2.2 Shell plate arrangement Cross seams shall not be used. Longitudinal welds shall not be used in the bottom half of the tank. Shell plate joints shall be offset, having a minimum distance e of five times the wall thickness but not less than 25 mm as shown in Figure 2.

Key e minimum distance Figure 2 — Shell-plate arrangement for inner and outer skin 4.2.3 Consumables All welding rods/wires and other consumables shall be compatible with the basic material. 4.2.4 Interstitial space The interstitial space gap should be as small as practically possible but suitable for the leak detection system to function. There shall be at least two sockets for the leak detection system and these shall be located at the highest practical point of the cylindrical part of the interstitial space. The interstitial space shall be connected to a leak detection system in order to monitor the integrity of the tank permanently; the leak detection systems shall fulfil the requirements of EN 13160-1, and EN 13160-2 or EN 13160-3. 4.3 Load bearing capacity When tested in accordance with 5.2, the maximum out of roundness of the completed tank after manufacture shall not exceed 1,5 % of the diameter. The tolerance on the overall length of the tank shall be ± 1 % of the real length stated by the manufacturer. 4.4 Additional requirements 4.4.1 Manways and inspection covers With the exception of cases where inspection covers are not allowed, the tanks shall be equipped with at least one inspection cover per compartment. In cases where inspection covers are not allowed, the tanks shall have one manway of at least d2 = 600 mm. No part of a compartment shall be more than 10 m from a manway. Single skin tanks shall always have a manway. Manways, inspection covers, nozzles and/or flanges shall be of set-through or set-on-type and flanges shall be welded in accordance with Table 2. For the dimensions of the manways and their components see Table 3. SIST EN 12285-1:2018

EN 12285-1:2018 (E) 13 Gaskets shall be provided and shall be suitable for their purpose. Table 3 — Dimensions of manway components Inside diameter Plate thickness of manway body Diameter of manway cover and corresponding flange Pitch circle diameter Bolt hole diameter Flange thickness and cover thickness Bolts d2 mm s7 mm d3 mm Kp mm mm s6 mm

Thread size Number
Class A Class B and C
600a 6 720 680
12 16
32 800 7 920 880 18 12 20 M16 44 1000b 7 1 120 1 080
— 20

48 a If a manway is required and no specification is given by the purchaser this diameter shall be used. b For tanks of class C inside diameters of the manway (d2) exceeding 800 mm is not per

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