This European Standard is a specification for vertical, cylindrical tanks, built on site, above ground and of which the primary liquid container is made of steel. The secondary container, if applicable, may be of steel or of concrete or a combination of both. An inner tank made only of pre-stressed concrete is excluded from the scope of this European Standard.
This European Standard specifies principles and application rules for the structural design of the containment during construction, testing, commissioning, operation (accidental included), and
decommissioning. It does not address the requirements for ancillary equipment such as pumps, pumpwells, valves, piping, instrumentation, staircases etc. unless they can affect the structural design
of the tank.
This European Standard applies to storage tanks designed to store products, having an atmospheric boiling point below ambient temperature, in a dual phase, i.e. liquid and vapour. The equilibrium
between liquid and vapour phases being maintained by cooling down the product to a temperature equal to, or just below, its atmospheric boiling point in combination with a slight overpressure in the storage tank.
The maximum design pressure of the tanks covered by this European Standard is limited to 500 mbar. For higher pressures, reference can be made to EN 13445, Parts 1 to 5.
The operating range of the gasses to be stored is between 0 °C and -165 °C. The tanks for the storage of liquefied oxygen, nitrogen and argon are excluded.
The tanks are used to store large volumes of hydrocarbon products and ammonia with low temperature boiling points, generally called Refrigerated Liquefied Gases (RLGs). Typical products
stored in the tanks are: methane, ethane, propane, butane, ethylene, propylene, butadiene (this range includes the LNGs and LPGs).
NOTE Properties of the gases are given in Annex A.
The requirements of this European Standard cannot cover all details of design and construction because of the variety of sizes and configurations that may be employed. Where complete requirements for a specific design are not provided, the intention is for the designer, subject to approval of the purchasers authorized representative, to provide design and details that are as safe as those laid out in this European Standard.
This European Standard specifies general requirements for the tank concept, selection and general design considerations.
Festgelegt sind die allgemeinen Anforderungen für stehende, zylindrische, standortgefertigte, oberirdische Tanks, deren zur Aufnahme der Flüssigkeit (tiefkalt verflüssigtes Gas) vorgesehener Primärbehälter aus Stahl besteht. Der Sekundärbehälter, falls vorhanden, darf aus Stahl oder Beton oder aus einer Kombination von beiden bestehen. Innentanks, die nur aus Spannbeton hergestellt werden, fallen nicht in den Anwendungsbereich dieser Norm, ebenso nicht Zusatzausrüstungen wie Pumpen, Pumpsonden, Armaturen, Rohrleitungen usw. Die Festlegungen gelten hinsichtlich der Bemessung der "Sicherheitshülle" während des Baues, der Prüfung und Inbetriebnahme, des Betriebes (unbeabsichtigter Betrieb eingeschlossen) und der Außerbetriebsetzung. Diese Norm gilt für Lagertanks, die für die Lagerung von Produkten vorgesehen sind, die in der dualen Phase, dh in der Flüssigkeits- und Dampfphase, bei atmosphärischem Druck einen Siedepunkt unterhalb der Umgebungstemperatur haben. Der maximale Auslegungsüberdruck für die in dieser Europäischen Norm behandelten Tanks ist auf 500 mbar begrenzt. Für höhere Drücke kann auf EN 13445-Teile Bezug genommen werden.