SIST EN 12285-4:2026
(Main)Workshop fabricated steel tanks - Part 4: Vertical cylindrical single skin and double skin tanks for the aboveground storage of flammable and nonflammable water polluting liquids other than for heating and cooling of buildings
Workshop fabricated steel tanks - Part 4: Vertical cylindrical single skin and double skin tanks for the aboveground storage of flammable and nonflammable water polluting liquids other than for heating and cooling of buildings
This document specifies the requirements for metallic shop fabricated cylindrical vertical steel tanks, single and double skin for the aboveground storage of water polluting liquids (both flammable and non-flammable) within the following limits:
— from Ø 1250 mm up to Ø 4 000 mm inner tank nominal diameter, and
— up to maximum overall shell length of 6 times the nominal inner tank diameter (or max 14 m shell lenght Lz), and
— tank possible to be divided from 1 to 5 compartments,
— for liquids with maximum density of up to 1,9 kg/l, and
— with an operating pressure (P0) of maximum 50kPa (0,5 bar (g)) and minimum – 5 kPa (- 50 mbar (g)), and
— where double skin tanks with vacuum leak detection system are used the kinematic viscosity of the stored media shall not exceed 5 × 10−3 m2/s.
This document is applicable for normal ambient temperature conditions (−40 °C to + 50 °C). Where temperatures are outside this range, additional requirements need to be taken into account.
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.
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 document
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).
Werksgefertigte Tanks aus Stahl - Teil 4: Vertikale zylindrische Metalltanks mit ein- und doppelwandiger Hülle zur oberirdischen Lagerung von brennbaren und nicht brennbaren wassergefährdenden Flüssigkeiten, die nicht zum Heizen oder Kühlen von Gebäuden bestimmt sind
Dieses Dokument legt die Anforderungen an werksgefertigte, zylindrische, vertikale Stahltanks mit ein- und doppelwandiger Hülle zur oberirdischen Lagerung (brennbarer und nicht brennbarer) wassergefährdender Flüssigkeiten mit folgenden Anwendungsgrenzen fest:
Nenn-Innendurchmesser des Tanks im Bereich von 1 250 mm bis 4 000 mm; und
maximale Gesamtlänge des Manteils bis zum 6-Fachen des Nenn-Innendurchmessers des Tanks (oder einer maximalen Mantellänge Lz von 14 m); und
der Möglichkeit, den Tank in 1 bis 5 Tankkammern zu unterteilen;
für Flüssigkeiten mit einer maximalen Dichte von 1,9 kg/l; und
mit einem Betriebsdruck (po) von höchstens 50 kPa (0,5 bar(g)) und mindestens −5 kPa (−50 mbar(g)); und
bei der Nutzung von doppelwandigen Tanks mit Unterdruck-Leckanzeigesystemen darf die kinematische Viskosität der Lagermedien (5 × 10−3) m2/s nicht überschreiten.
Dieses Dokument ist unter den Umgebungstemperaturbedingungen des Normalklimas (d. h. im Bereich von −40 °C bis +50 °C) anwendbar. Bei Temperaturen außerhalb dieses Bereichs ist es notwendig, zusätzliche Anforderungen zu beachten.
Dieses Dokument ist nicht auf Tanks anwendbar, die für die Lagerung und/oder Bereitstellung von Brennstoff/Gas für Heiz-/Kühlsysteme von Gebäuden und von nicht für den menschlichen Gebrauch bestimmtem Warm- oder Kaltwasser genutzt werden, und gilt auch nicht für die in erdbebengefährdeten Gebieten anfallenden Lasten und die dafür notwendigen besonderen Maßnahmen.
Dieses Dokument gilt wegen der besonderen damit verbundenen Gefahren nicht für die Lagerung von Flüssigkeiten der in Tabelle 1 aufgeführten Gefahrgutklassen.
Tabelle 1 - Liste von Gefahrgütern, die von diesem Dokument nicht abgedeckt werden
UN-Klassifizierung Gefahrgüter vom Typ
Klasse 1 Explosive Stoffe
Klasse 4.2 Selbstentzündliche Stoffe
Klasse 4.3 Stoffe, die in Berührung mit Wasser entzündliche Gase bilden
Klasse 5.2 Organische Peroxide
Klasse 6.2 Ansteckungsgefährliche Stoffe
Klasse 7 Radioaktive Stoffe, blausäurehaltige oder blausäurelösliche Flüssigkeiten, Metallkohlenstoffe, Flusssäure, bromhaltige Flüssigkeiten
ANMERKUNG Die hier in Bezug genommenen Klassifizierungen sind die vom Fachausschuss der Vereinten Nationen für die Beförderung gefährlicher Güter angenommenen Klassifizierungen (und sind nicht als die in 6.2 beschriebenen Tankklassen zu verstehen).
Réservoirs en acier fabriqués en atelier - Réservoirs verticaux cylindriques à simple et double paroi pour le stockage aérien de liquides inflammables et non inflammables polluant l'eau, en dehors du chauffage et du refroidissement des bâtiments
Le présent document spécifie les prescriptions pour les réservoirs en acier verticaux cylindriques fabriqués en atelier, à simple et double paroi pour le stockage aérien de liquides polluant l’eau (inflammables et non inflammables) dans les limites suivantes :
• diamètre nominal du réservoir intérieur de Ø 1 250 mm jusqu’à Ø 4 000 mm et ;
• longueur maximale d’encombrement égale à 6 fois le diamètre nominal du réservoir intérieur, et
• possibilité pour un réservoir d’être divisé de 1 à 5 compartiments
• pour les liquides présentant une masse volumique maximale égale à 1,9 kg/l et,
• avec une pression de service (P0) maximale de 50 kPa (0,5 bar (eff)) et une pression de service minimale de – 5 kPa (– 50 mbar(eff)) et,
• lorsque des réservoirs à double paroi avec un système de détection de fuites du vide sont utilisés, la viscosité cinématique des fluides stockés ne dépasse pas 5 × 10-3 m²/s.
Le présent document s’applique à des conditions de température ambiante normales (-40 °C à + 50 °C). Lorsque les températures sont à l’extérieur de cette plage, des prescriptions complémentaires sont prises en compte.
Le présent document 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.
Le présent document 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.
Tableau 1 — Liste des matières dangereuses non couvertes par la présente norme
Classification de l’ONU Type de matières dangereuses
Classe 1 Explosifs
Classe 4.2 Substances sujettes à une combustion spontanée
Classe 4.3 Substances émettant des gaz inflammables au contact de l’eau
Classe 5.2 Peroxydes organiques
Classe 6.2 Substances infectieuses
Classe 7 Substances radioactives, liquides ou solvants cyanhydriques, métal-carbones, acide fluorhydrique, liquides bromhydriques
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 en 6.2)
V delavnici izdelani jekleni rezervoarji - 4. del: Enoplaščni in dvoplaščni pokončni valjasti rezervoarji za nadzemno skladiščenje gorljivih in negorljivih tekočin, ki onesnažujejo vodo in ki se ne uporabljajo za ogrevanje in hlajenje stavb
General Information
- Status
- Published
- Public Enquiry End Date
- 02-Aug-2022
- Publication Date
- 12-Mar-2026
- Technical Committee
- TLP - Pressure vessels
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 04-Mar-2026
- Due Date
- 09-May-2026
- Completion Date
- 13-Mar-2026
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 12285-4:2025 (CEN) is a European standard for workshop fabricated steel tanks, specifically covering vertical cylindrical single skin and double skin tanks for the aboveground storage of flammable and non‑flammable water‑polluting liquids (not including building heating/cooling systems). The standard defines design, fabrication, testing and documentation requirements for metallic shop‑fabricated tanks within defined geometric, pressure and material limits to ensure safety, environmental protection and regulatory compliance.
Key Topics and Requirements
- Scope & limits: inner diameters from Ø 1 250 mm to Ø 4 000 mm, maximum shell length up to 6 × nominal diameter (or 14 m), 1–5 compartments, liquid density up to 1.9 kg/L, and normal ambient temperatures −40 °C to +50 °C.
- Operating pressure: maximum +50 kPa (0.5 bar g) and minimum −5 kPa (−50 mbar g).
- Double skin tanks: requirements for interstitial (vacuum) leak detection; stored fluid kinematic viscosity limit for vacuum systems ≤ 5 × 10−3 m2/s.
- Exclusions: not applicable to tanks for building heating/cooling fuel/gas, certain hot/cold non‑potable water uses, seismic‑specific measures, or storage of dangerous goods in specific UN classes (e.g., Class 1 explosives; Class 4.2/4.3; Class 5.2; Class 6.2; Class 7 radioactive/other listed liquids).
- Fabrication and materials: shell plates, dished ends, welding types, consumables and tolerances; specified mechanical resistance, wall thickness rules and requirements for tank legs, lifting lugs and fittings.
- Testing & inspection: prototype and production testing (mechanical stability, tightness-gas/liquid), interstitial space testing for double skin tanks, welding inspection and sampling.
- Operational controls: venting, overfill prevention, marking, documentation and environmental aspects (release control, coating, durability, maintenance guidance).
Applications and Users
EN 12285-4 is intended for:
- Tank manufacturers and fabricators producing workshop‑built vertical cylindrical tanks.
- Design engineers specifying aboveground storage for water‑polluting liquids.
- Site owners / operators of fuel depots, chemical storage facilities, and industrial plants requiring compliant aboveground tanks.
- Inspectors, certification bodies and insurers assessing conformity, leak detection and safety.
- Environmental regulators and consultants evaluating containment and spill prevention measures.
Keywords: EN 12285-4, workshop fabricated steel tanks, vertical cylindrical tanks, double skin tanks, single skin tanks, aboveground storage, water-polluting liquids, CEN.
Related Standards
Normative references in the document include EN 10025‑2, EN 10204, the EN 13160 leak detection series, EN 13616, EN ISO 13920, and EN ISO 898‑1-all relevant when applying EN 12285‑4 requirements.
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Frequently Asked Questions
SIST EN 12285-4:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Workshop fabricated steel tanks - Part 4: Vertical cylindrical single skin and double skin tanks for the aboveground storage of flammable and nonflammable water polluting liquids other than for heating and cooling of buildings". This standard covers: This document specifies the requirements for metallic shop fabricated cylindrical vertical steel tanks, single and double skin for the aboveground storage of water polluting liquids (both flammable and non-flammable) within the following limits: — from Ø 1250 mm up to Ø 4 000 mm inner tank nominal diameter, and — up to maximum overall shell length of 6 times the nominal inner tank diameter (or max 14 m shell lenght Lz), and — tank possible to be divided from 1 to 5 compartments, — for liquids with maximum density of up to 1,9 kg/l, and — with an operating pressure (P0) of maximum 50kPa (0,5 bar (g)) and minimum – 5 kPa (- 50 mbar (g)), and — where double skin tanks with vacuum leak detection system are used the kinematic viscosity of the stored media shall not exceed 5 × 10−3 m2/s. This document is applicable for normal ambient temperature conditions (−40 °C to + 50 °C). Where temperatures are outside this range, additional requirements need to be taken into account. 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. 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 document 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).
This document specifies the requirements for metallic shop fabricated cylindrical vertical steel tanks, single and double skin for the aboveground storage of water polluting liquids (both flammable and non-flammable) within the following limits: — from Ø 1250 mm up to Ø 4 000 mm inner tank nominal diameter, and — up to maximum overall shell length of 6 times the nominal inner tank diameter (or max 14 m shell lenght Lz), and — tank possible to be divided from 1 to 5 compartments, — for liquids with maximum density of up to 1,9 kg/l, and — with an operating pressure (P0) of maximum 50kPa (0,5 bar (g)) and minimum – 5 kPa (- 50 mbar (g)), and — where double skin tanks with vacuum leak detection system are used the kinematic viscosity of the stored media shall not exceed 5 × 10−3 m2/s. This document is applicable for normal ambient temperature conditions (−40 °C to + 50 °C). Where temperatures are outside this range, additional requirements need to be taken into account. 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. 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 document 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 12285-4:2026 is classified under the following ICS (International Classification for Standards) categories: 13.300 - Protection against dangerous goods; 23.020.10 - Stationary containers and tanks. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 12285-4:2026 has the following relationships with other standards: It is inter standard links to SIST EN 13160-4:2016+A1:2025, SIST EN 13616-1:2025, SIST EN 10025-2:2005, SIST EN 13616-2:2016+A1:2025, SIST EN ISO 13920:2023, SIST EN 13160-1:2016, SIST EN 22768-1:2000, SIST EN ISO 898-1:2013, SIST EN 22768-2:2000, SIST EN 12285-1:2018, SIST EN 13160-2:2016+A1:2025, SIST EN 13160-3:2016+A1:2025, SIST EN 10204:2004. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 12285-4:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2026
V delavnici izdelani jekleni rezervoarji - 4. del: Enoplaščni in dvoplaščni pokončni
valjasti rezervoarji za nadzemno skladiščenje gorljivih in negorljivih tekočin, ki
onesnažujejo vodo in ki se ne uporabljajo za ogrevanje in hlajenje stavb
Workshop fabricated steel tanks - Part 4: Vertical cylindrical single skin and double skin
tanks for the aboveground storage of flammable and nonflammable water polluting
liquids other than for heating and cooling of buildings
Werksgefertigte Tanks aus Stahl - Teil 4: Vertikale zylindrische Metalltanks mit ein- und
doppelwandiger Hülle zur oberirdischen Lagerung von brennbaren und nicht brennbaren
wassergefährdenden Flüssigkeiten, die nicht zum Heizen oder Kühlen von Gebäuden
bestimmt sind
Réservoirs en acier fabriqués en atelier - Réservoirs verticaux cylindriques à simple et
double paroi pour le stockage aérien de liquides inflammables et non inflammables
polluant l'eau, en dehors du chauffage et du refroidissement des bâtiments
Ta slovenski standard je istoveten z: EN 12285-4:2025
ICS:
13.300 Varstvo pred nevarnimi Protection against dangerous
izdelki goods
23.020.10 Nepremične posode in Stationary containers and
rezervoarji tanks
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12285-4
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2025
EUROPÄISCHE NORM
ICS 13.300; 23.020.10
English Version
Workshop fabricated steel tanks - Part 4: Vertical
cylindrical single skin and double skin tanks for the
aboveground storage of flammable and nonflammable
water polluting liquids other than for heating and cooling
of buildings
Réservoirs en acier fabriqués en atelier - Réservoirs Werksgefertigte Tanks aus Stahl - Teil 4: Vertikale
verticaux cylindriques à simple et double paroi pour le zylindrische Metalltanks mit ein- und doppelwandiger
stockage aérien de liquides inflammables et non Hülle zur oberirdischen Lagerung von brennbaren und
inflammables polluant l'eau, en dehors du chauffage et nicht brennbaren wassergefährdenden Flüssigkeiten,
du refroidissement des bâtiments die nicht zum Heizen oder Kühlen von Gebäuden
bestimmt sind
This European Standard was approved by CEN on 20 November 2023.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12285-4:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 6
3 Terms, definitions, symbols, and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Symbols and abbreviations . 10
4 Product characteristics . 11
4.1 General . 11
4.2 Welding . 11
4.2.1 Types of joints . 11
4.2.2 Shell plate arrangement . 13
4.2.3 Consumables . 14
4.2.4 Interstitial space . 14
4.3 Load bearing capacity . 15
4.4 Additional requirements . 15
4.4.1 Manways . 15
4.4.2 Structural bolts . 17
4.4.3 Tank fittings, pipes and nozzles . 17
4.4.4 Lifting lugs . 20
4.4.5 Tank leg construction . 20
4.5 Tank compartments . 21
4.6 Tank pipes . 21
4.6.1 General . 21
4.6.2 Vent pipes . 21
4.6.3 Suction pipes . 21
4.6.4 Fill pipes . 21
4.7 Mechanical resistance and stability . 22
4.7.1 Materials for shell, dished ends and manways . 22
4.7.2 Wall thickness . 22
4.7.3 Stiffening resistance . 23
4.8 Internal pressure . 24
4.9 Tightness (gas and liquid). 24
4.10 Release of dangerous substances . 25
4.11 Coating . 25
5 Testing and sampling methods . 25
5.1 Mechanical resistance and stability . 25
5.1.1 Materials for shell, dished ends and manways . 25
5.1.2 Wall thickness . 25
5.1.3 Welding . 25
5.1.4 Stiffening resistance . 25
5.1.5 Tank leg construction . 25
5.2 Tightness test (gas or liquid) . 25
5.3 Testing of additional requirements . 26
5.3.1 Manways and inspection covers . 26
5.3.2 Structural bolts . 26
5.3.3 Tank fittings, pipes and nozzles . 26
5.3.4 Lifting lugs . 26
5.4 Durability. 26
6 Classification . 26
6.1 Tank type . 26
6.2 Tank classes . 27
6.3 Designation and purchaser's specification . 27
7 Marking and labelling . 27
7.1 Marking of the tank . 27
7.2 Documentation . 28
8 Environmental aspects . 28
Annex A (informative) Tank installation and use . 29
A.1 Transport . 29
A.2 Installation procedure . 29
A.2.1 Planning . 29
A.2.2 Lifting . 29
A.2.3 Mounting to ground . 30
A.3 Maintenance . 30
Annex B (informative) Environmental aspects . 31
Bibliography . 34
European foreword
This document (EN 12285-4:2025) 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 June 2026, and conflicting national standards shall be
withdrawn at the latest by June 2026.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
1 Scope
This document specifies the requirements for metallic shop fabricated shop fabricated cylindrical vertical
steel tanks, single and double skin for the aboveground storage of water polluting liquids (both
flammable and non-flammable) within the following limits:
• from Ø 1250 mm up to Ø 4 000 mm inner tank nominal diameter and,
• up to maximum overall length of 6 times the nominal inner tank diameter and
• tank possible to be divided from 1 to 5 compartments
• for liquids with maximum density of up to 1,9 kg/l and,
• with an operating pressure (P ) of maximum 50kPa (0,5 bar (g)) and minimum – 5 kPa (- 50 mbar
(g)) and,
• where double skin tanks with vacuum leak detection system are used, the cinematic viscosity of the
-3 2
stored media does not exceed 5 x 10 m /s
This document is applicable for normal ambient temperature conditions (-40 °C to + 50 °C). Where
temperatures are outside this range, additional requirements are taken into account.
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.
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- Type of dangerous goods
classification
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).
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 12285-1:2018, 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
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 13160-4, Leak detection systems - Part 4: Requirements and test/assessment methods for sensor based
leak detection systems
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 898-1:2013)
EN 13616-1, Overfill prevention devices for static tanks for liquid fuels - Part 1: Overfill prevention devices
with closure device
EN 13616-2, Overfill prevention devices for static tanks for liquid fuels - Part 2: Overfill prevention devices
without a closure device
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 https://www.electropedia.org/
• ISO Online browsing platform: available at https://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
aboveground tank
tank which is totally above ground installed
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. See Figure 1 and Figure 2.
Note 2 to entry: See Figure 1, Tank type Double skin.
Figure 1 — Example of tank symbols for double skin tank
Figure 2 — Example of tank symbols for single skin tank
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.
3.1.7
operating pressure
p
o
pressure bar(g) inside the tank above the liquid during operating conditions
3.1.8
prototype tank test pressure
p
t1
pressure bar(g) to which the tank or compartment is subjected for testing
3.1.9
prototype interstitial space test pressure
p
t2
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
p
t3
pressure bar(g) to which the tank or compartment is subjected to leak testing
3.1.11
interstitial space leak tight test pressure
pt
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)
d external nominal diameter of the tank
d internal diameter of the manway
d diameter of the manway cover and corresponding flange
h length of the straight flange of the dished end
H Height of the tank leg construction
L
H Height of spill bund to interstitial space
b
H Height of bottom dished end to ground
c
K pitch circle diameter of manway bolts
p
l length of the compartment of a tank without dished ends
c
NOTE 1 For a single compartment tank Lc = Lz
l overall length of the tank
o
l length of the tank without dished ends
z
NOTE 2 For a single compartment tank Lc = Lz
p test pressure
t
p test pressure for prototype test of tank
t1
p test pressure of prototype test of interstitial space
t2
p test pressure of leak tightness test of tank
t3
p test pressure of leak tightness test of interstitial space
t4
r crown radius of dished ends
r knuckle radius of dished ends
s nominal thickness of shell (single walled tank) and inner shell (double walled
tank)
s interstitial space
s nominal thickness of outer shell
s nominal thickness of outer dished ends
s nominal thickness of compartment dished ends
s nominal thickness of manway flange and cover
s plate thickness of manway body
s nominal thickness of inner dished ends
nominal thickness of secondary manway flange and cover
s
plate thickness of secondary manway body
s
nominal thickness of tank leg shell
s
γ incline angle for T-joint welding
4 Product characteristics
4.1 General
The tank material as well as possible coating (systems) used shall be suitable for long term contact with
the stored media. Guidelines on material specifications in relation to stored media are provided in EN
12285-1:2018 Annex B.
The tank sealings/gaskets used shall be fit for the intended use.
The safe working capacity of the tank should usually not exceed 95 % 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. Tank welding quality should meet minimum standard EN ISO 5817 (welding
class D).
Table 2— Types of welded joints
Applicable welding class of tanks and liquid
Number Types of joints
(liquid touched wall)
1 Square butt joint Plate misalignment shall not exceed 0,3 s
respectively 0,3 s 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 only
a = 0,7 s
3b Overlap joint For class A, B and C
For outer skin on outer dished end only
a = 0,7 s
4 Fillet weld in T-joint For class A, B and C
For nozzles and manways in the outer skin
a = 0,7 s
min
s : thickness of the thinner plate
min
5 Fillet weld (full penetration) in T- For class A, B and C
joint
For manways, nozzles and inspection covers
γ = 45°
Applicable welding class of tanks and liquid
Number Types of joints
(liquid touched wall)
6 Double fillet weld in T-joint For class A, B and C
For manways, nozzles and stiffening rings
a = 0,7 s
min
s = thickness of the thinner plate
min
7 Fillet weld in overlap joint For class A, B and C
For compartment dished ends with knuckle radius
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 s
10 Corner and fillet weld For class A and B
For set-on manways and nozzles
4.2.2 Shell plate arrangement
Cross seams shall not be used.
Shell plate joints shall be offset, having a minimum distance e of five times the wall thickness but not less
than 100 mm as shown in Figure 2.
Key
e minimum distance
Figure 3 — 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 interstial cap should be suitable for leak detection selected and can be use for other needed functions
as heating, insulation, cooling, or safety equipmments needed.
The interstitial space must cover any tank manway connections that are below the liquid level.
Please note:
• Leak detection systems should comply with EN 13160 Class 1 or 2 using air, Class 3 using liquid level
indicators or Class 4 by using liquid level or vapour indicator.
• When using a Class 3 or 4 system, the interstitial space needs venting pipe on the top point of the
tank.
Key
1 Th
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